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  • 1.
    Albrektsson, Joakim
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Flansbjer, Mathias
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Lindqvist, Jan-Erik
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Brandteknik, material (BRm).
    Jansson, Robert
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Assessment of concrete structures after fire2011Rapport (Refereegranskat)
  • 2.
    Albrektsson, Joakim
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Flansbjer, Mathias
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh). SP Sveriges tekniska forskningsinstitut.
    Lindqvist, Jan-Erik
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Brandteknik, material (BRm). SP Sveriges tekniska forskningsinstitut.
    Jansson, Robert
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd. SP Sveriges tekniska forskningsinstitut.
    Assessment of fire exposed concrete with full-field strain determination2011Ingår i: Proceedings pro080 : 2nd International Workshop on Concrete Spalling due to Fire Exposure., RILEM , 2011, , s. 337-344Konferensbidrag (Refereegranskat)
  • 3.
    Albrektsson, Joakim
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Jansson, Robert
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Flansbjer, Mathias
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Lindqvist, Jan-Erik
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Brandteknik, material (BRm).
    Quantification of fire damage of concrete for tunnel applications2012Ingår i: Proceedings from the Fifth International Symposium on Tunnel Safety and Security, SP , 2012, , s. 685-694Konferensbidrag (Övrigt vetenskapligt)
  • 4.
    Bergström, Gunnar
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Göteborg (BMg).
    Flansbjer, Mathias
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Karlsson, Linda
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Sällberg, Sven-Erik
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Göteborg (BMg).
    Thörnblom, Kristian
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Göteborg (BMg).
    Acceptanskriterier för repor och intryck i plaströr2009Rapport (Övrig (populärvetenskap, debatt, mm))
  • 5.
    Bergström, Gunnar
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Göteborg (BMg).
    Flansbjer, Mathias
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Karlsson, Linda
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Sällberg, Sven-Erik
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Göteborg (BMg).
    Thörnblom, Kristian
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Göteborg (BMg).
    Acceptanskriterier för repor och intryck i plaströr Accpetance criteria for scratches and indentations in plastic pipes2009Rapport (Refereegranskat)
    Abstract [sv]

    Development of materials and laying techniques have arisen the question how scratches and indentations in plastics pipes affect the strength and technical lifetime of pipelines. Scratches may occur both in the manufacturing of the pipes, in connection with the installation and subsequent maintenance. The problems in assessing the failure risk from scratches and indentations are similar for pipes used in gas and water distribution and in district heating applications. Therefore, a broad effort to identify the risks in relation to current pipe materials is technically and economically justified. The project has aimed to evaluate the effect of scratches and indentations on the technical lifetime of plastics pipes and to present criteria for maximum allowable depth of scratches and indentations. The study on pressure pipes focused on the conditions for scratched polyethylene pipes to achieve a lifetime of 50 years. It is noted that a scratch damage can not be judged solely on the basis of its depth and sharpness. To assess the impact of the scratch on the serviceability of the pipe, consideration must also be taken to the material from which the pipe was made and the safety factor used in the design. Extensive pressure tests show that pipes made of modern materials can withstand surface scratches to a higher degree than pipes of older materials. For pipes made of modern bimodal PE80 and PE100 materials, scratches up to 10% depth may be accepted without reduction of rated pressure. However, for pipes of older material, a reduction in pressure may be required already at smaller scratches. The study also indicates that for the same relative scratch depth, a greater reduction in pressure is required with increasing pipe dimension. The study on the non pressure pipes shows that the studied polypropylene pipes resist both deep scratches combined with ovalization and large indentations without any cracks penetrating the pipe wall. However, the extent and development of crazing and surface cracking vary with scratch depth, deformation level and material. The test pipes were subjected to extreme conditions very rarely or never occurring in practice. This suggests that small scratches at moderate ovalization and realistic indentations in temperatures around room temperature do not affect the lifetime of the pipes. One objective of the project was to develop a method for the evaluation of the scratch resistance of a pipe. In the proposed test method the force needed to produce a specified scratch is measured. This force is used as a relative measure of the scratch resistance of a pipe material when compared to other materials. In order to assess to what extent a scratch affects the lifetime of the pipe, the depth of the scratch must be estimated with reasonable accuracy. Since the scratch in many cases is found on existing pipelines the method must be suited for field use. To achieve that a simple instrument for scratch depth measurements was made and evaluated.

  • 6.
    Bergström, Gunnar
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Göteborg (BMg).
    Flansbjer, Mathias
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Karlsson, Linda
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Sällberg, Sven-Erik
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Göteborg (BMg).
    Thörnblom, Kristian
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Göteborg (BMg).
    Accpetance criteria for scratches and indentations in plastic pipes2009Rapport (Refereegranskat)
    Abstract [sv]

    Development of materials and laying techniques have arisen the question how scratches and indentations in plastics pipes affect the strength and technical lifetime of pipelines. Scratches may occur both in the manufacturing of the pipes, in connection with the installation and subsequent maintenance. The problems in assessing the failure risk from scratches and indentations are similar for pipes used in gas and water distribution and in district heating applications. Therefore, a broad effort to identify the risks in relation to current pipe materials is technically and economically justified. The project has aimed to evaluate the effect of scratches and indentations on the technical lifetime of plastics pipes and to present criteria for maximum allowable depth of scratches and indentations. The study on pressure pipes focused on the conditions for scratched polyethylene pipes to achieve a lifetime of 50 years. It is noted that a scratch damage can not be judged solely on the basis of its depth and sharpness. To assess the impact of the scratch on the serviceability of the pipe, consideration must also be taken to the material from which the pipe was made and the safety factor used in the design. Extensive pressure tests show that pipes made of modern materials can withstand surface scratches to a higher degree than pipes of older materials. For pipes made of modern bimodal PE80 and PE100 materials, scratches up to 10% depth may be accepted without reduction of rated pressure. However, for pipes of older material, a reduction in pressure may be required already at smaller scratches. The study also indicates that for the same relative scratch depth, a greater reduction in pressure is required with increasing pipe dimension. The study on the non pressure pipes shows that the studied polypropylene pipes resist both deep scratches combined with ovalization and large indentations without any cracks penetrating the pipe wall. However, the extent and development of crazing and surface cracking vary with scratch depth, deformation level and material. The test pipes were subjected to extreme conditions very rarely or never occurring in practice. This suggests that small scratches at moderate ovalization and realistic indentations in temperatures around room temperature do not affect the lifetime of the pipes. One objective of the project was to develop a method for the evaluation of the scratch resistance of a pipe. In the proposed test method the force needed to produce a specified scratch is measured. This force is used as a relative measure of the scratch resistance of a pipe material when compared to other materials. In order to assess to what extent a scratch affects the lifetime of the pipe, the depth of the scratch must be estimated with reasonable accuracy. Since the scratch in many cases is found on existing pipelines the method must be suited for field use. To achieve that a simple instrument for scratch depth measurements was made and evaluated.

  • 7.
    Chozas, Valle
    et al.
    ACCIONA, Spain.
    Larraza, Iñigo
    ACCIONA, Spain.
    Vera-Agullo, Jose
    ACCIONA, Spain.
    Williams Portal, Natalie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB, Betong & Berg.
    Mueller, Urs
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB, Betong & Berg.
    Da Silva, Nelson
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB, Betong & Berg.
    Flansbjer, Mathias
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Synthesis and characterization of reactive powder concrete for its application on thermal insulation panels2015Ingår i: IOP Conference Series: Materials Science and Engineering, Institute of Physics Publishing (IOPP), 2015, Vol. 96, nr 1, artikel-id 012044Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper describes the synthesis and characterization of a set of textile reinforced reactive powder concrete (RPC) mixes that have been prepared in the framework of the SESBE project which aims to develop facade panels for the building envelope. In order to reduce the environmental impact, high concentration of type I and II mineral additions were added to the mixtures (up to 40% of cement replacement). The mechanical properties of the materials were analysed showing high values of compression strength thus indicating no disadvantages in the compression mechanical performance (∼140 MPa) and modulus of elasticity. In order to enable the use of these materials in building applications, textile reinforcement was introduced by incorporating layers of carbon fibre grids into the RPC matrix. The flexural performance of these samples was analysed showing high strength values and suitability for their further utilization.

  • 8.
    Cinar, Ahmet
    et al.
    University of Sheffield, UK.
    Barhli, Selim
    University of Oxford, UK.
    Hollis, Dave
    LaVision, UK.
    Flansbjer, Mathias
    RISE - Research Institutes of Sweden, Säkerhet och transport.
    Tomlinson, Rachel
    University of Sheffield, UK.
    Marrow, James
    University of Oxford, UK.
    Mostafavi, Mahmoud
    University of Bristol, UK.
    An autonomous surface discontinuity detection and quantification methodby digital image correlation and phase congruency2017Ingår i: Optics and lasers in engineering, ISSN 0143-8166, E-ISSN 1873-0302, Vol. 96, s. 94-106Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Digital image correlation has been routinelyused to measure full-field displacements in many areas of solid mechanics,including fracture mechanics. Accurate segmentation of the crack path is neededto study its interaction with the microstructure and stress fields, and studiesof crack behaviour, such as the effect of closure or residual stress infatigue, require data on its opening displacement. Such information can beobtained from any digital image correlation analysis of cracked components, butit collection by manual methods is quite onerous, particularly for massiveamounts of data. We introduce the novel application of Phase Congruency to detectand quantify cracks and their opening. Unlike other crack detection techniques,Phase Congruency does not rely on adjustable threshold values that require userinteraction, and so allows large datasets to be treated autonomously. Theaccuracy of the Phase Congruency based algorithm in detecting cracks isevaluated and compared with conventional methods such as Heaviside function fitting.As Phase Congruency is a displacementbased method, it does not suffer from thenoise intensification to which gradient-based methods (e.g. strain thresholding)are susceptible. Its application is demonstrated to experimental data forcracks in quasi-brittle (Granitic rock) and ductile (Aluminium alloy)materials.

  • 9.
    Crocetti, Roberto
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Sartoria, Tiziano
    Flansbjer, Mathias
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Timber-Concrete Composite Structures with Prefabricated FRC Slab2010Ingår i: WCTE 11th World Conference on Timber Engineering, World Conference on Timber Engineering , 2010, , s. 121-130Konferensbidrag (Refereegranskat)
  • 10.
    Flansbjer, Mathias
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Brandpåverkan på samverkanspelare2004Rapport (Refereegranskat)
  • 11.
    Flansbjer, Mathias
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Composite Action in CFT Columns under Normal Conditions and in Case of Fire2006Ingår i: Proceedings of the 2nd International fib Congress, Naples, 2006, , s. 08:05Konferensbidrag (Övrigt vetenskapligt)
  • 12.
    Flansbjer, Mathias
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Hellers, Bo Göran
    Tests on BCE2011Konferensbidrag (Övrigt vetenskapligt)
  • 13.
    Flansbjer, Mathias
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Honfi, Daniel
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Vennetti, Daniel
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Williams Portal, Natalie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Mueller, Urs
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Wlasak, Lech
    Mostostal Warszawa SA, Poland.
    Strutural performance of GFRP connectors in Composite sandwich facade elements2016Ingår i: Journal of Facade Design and Engineering, ISSN 2213-302X, Vol. 4, nr 1-2, s. 35-52Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A systematic testing and modelling program has been developed for the verification of the structural performance of facade sandwich elements to take structural aspects into consideration in the SESBE research project, focusing on the development of “smart” facade elements.

    The present paper mainly focuses on the verification of the mechanical performance of the glass fibre reinforced polymer (GFRP) connectors of the novel type of facade element composed of reactive powder concrete (RPC) panels with foam concrete insulation between them. Because of the reduced thickness of the large facade elements, the performance of the connectors is critical for the entire structural concept. The first series of the testing and modelling programme concerning connector performance are presented here. The results suggest that sufficient strength and ductility of the connectors can be ensured using GFRP in the proposed thin light-weight facade elements.

  • 14.
    Flansbjer, Mathias
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Honfi, Daniel
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Vennetti, Daniel
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Williams Portal, Natalie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB, Betong & Berg.
    Mueller, Urs
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB, Betong & Berg.
    Własak, Lech
    Mostostal Warszawa SA, Poland.
    Structural Concept of Novel RPC Sandwich Façade Elements with GFRP Connectors2016Ingår i: IABSE Congress Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment. Report, IABSE c/o ETH Hönggerberg , 2016, s. 2164-2171Konferensbidrag (Refereegranskat)
    Abstract [en]

    The SESBE research project aims to develop novel smart sandwich façade elements with high insulating capabilities while providing a reduced thickness in conjunction with superior mechanical and durability properties. The present paper mainly focuses on the verification of the mechanical performance of the glass fibre reinforced polymer (GFRP) connectors in the façade element composed of reactive powder concrete (RPC) panels with foam concrete insulation between them. Because of the reduced thickness of the large façade elements, the performance of the connectors is critical for the entire structural concept. A description of structural performance and results based on experimental methods and finite element (FE) analysis are presented.

  • 15.
    Flansbjer, Mathias
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Honfi, Daniel
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik, Strukturer och Komponenter.
    Williams Portal, Natalie
    Mueller, Urs
    Larraza, Inigo
    Edgar, Jan-Olof
    Wlasak, Lech
    Structural behaviour of RPC sandwich façade elements with GFRP connectors2015Ingår i: VII International Congress on Architectural Envelopes. San Sebastian-Donostia, Spain. 2015-05-27--29, 2015Konferensbidrag (Övrigt vetenskapligt)
  • 16.
    Flansbjer, Mathias
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Kutti, Mathias
    Löfgren, Tomas
    Samuelson, Ingemar
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Energiteknik (ET).
    Armering av plattbärlagsskarv. Sammanfattning och dimensioneringsanvisnignar.2008Rapport (Refereegranskat)
  • 17.
    Flansbjer, Mathias
    et al.
    RISE - Research Institutes of Sweden, Säkerhet och transport, Safety.
    Lindqvist, Jan Erik
    RISE - Research Institutes of Sweden, Samhällsbyggnad, CBI Betonginstitutet.
    Meso Mechanical Study of Cracking Process in Concrete Subjected toTensile Loading2018Ingår i: Nordic Concrete Research, ISSN 0800-6377, Vol. 59, nr 2, s. 13-29Artikel i tidskrift (Övrigt vetenskapligt)
    Abstract [en]

    This project focused on how the cracking process in concrete is influenced by both the micro and meso structures of concrete. The aim was to increase knowledge pertaining to the effect of critical parameters on the cracking process and how this is related to the material's macroscopic properties. A methodology based on the combination of different experimental methods and measuring techniques at different scales was developed. Crack propagation during tensile loading of small-scale specimens in a tensile stage was monitored by means of Digital Image Correlation (DIC) and Acoustic Emission (AE). After testing, crack patterns were studied using fluorescence microscopy.

  • 18.
    Flansbjer, Mathias
    et al.
    RISE - Research Institutes of Sweden, Säkerhet och transport, Safety.
    Lindqvist, Jan Erik
    RISE - Research Institutes of Sweden, Samhällsbyggnad, CBI Betonginstitutet.
    Methodology for Mesomechanical Study of Concrete Material2017Konferensbidrag (Refereegranskat)
    Abstract [en]

    This project focuses on detailed studies of how the cracking process in concrete is influenced by the concrete micro- and mesostructure. The aim is to increase knowledge of how critical parameters affect the cracking process and how this is related to the material's macroscopic properties. A methodology based on the combination of different experimental methods and measuring techniques at different scale levels has been developed. Crack propagation during tensile loading of small-scale specimens in a tensile stage was monitored by means of Digital Image Correlation (DIC) and Acoustic Emission (AE). After the test, crack patterns were studied using fluorescence microscopy.

  • 19. Flansbjer, Mathias
    et al.
    Lindqvist, Jan Erik
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Metoder för detaljerade studier av sprickbildning2010Ingår i: Bygg & teknik, ISSN 0281-658X, Vol. 102, nr 7, s. 42-46Artikel i tidskrift (Övrigt vetenskapligt)
  • 20. Flansbjer, Mathias
    et al.
    Lindqvist, Jan Erik
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Metoder för detaljerade studier av sprickbildning2010Ingår i: Bygg och teknik, ISSN 0281-658X, Vol. 102, nr 7, s. 42-46Artikel i tidskrift (Övrigt vetenskapligt)
  • 21.
    Flansbjer, Mathias
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Lindqvist, Jan-Erik
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Brandteknik, material (BRm).
    Visual assessment of fire damaged concrete2011Ingår i: BrandPosten, nr 44, s. 12-13Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
    Abstract [sv]

    Fire can reduce the load-carrying capacity of concrete structures. A new innovative method, Optical Deformation Measurement, can be used to determine how far into the concrete damage has penetrated. The method involves measurements on test cores from the damaged structure.

  • 22.
    Flansbjer, Mathias
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Lindqvist, Jan-Erik
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Brandteknik, material (BRm).
    Johansson, Gabriel
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Löfgren, Michael
    Mechanical behaviour of concrete piles affected by sulphate attack2013Ingår i: Proceeding of the International IABSE Conference:, 2013, , s. 4Konferensbidrag (Refereegranskat)
  • 23.
    Flansbjer, Mathias
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Lindqvist, Jan-Erik
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Brandteknik, material (BRm).
    Silfwerbrand, Johan
    Quantitative fracture characteristics in shear load2011Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    Today, no general design method for shear strength capacity of RC beams can predict the failure load with a high degree of accuracy. The failure load between two beams cast from the same batch may vary as much as 30 percent. This project aims at investigating factors affecting the shear strength capacity based on an understanding of micro and meso scale material properties. Tests were performed on beams with two different types of aggregate and two different w/c. The crack propagation was monitored during the loading by means of DIC and AE. The results show that the use of natural aggregates or crushed aggregates as finer fractions strongly affect the shear strength capacity. From direct shear tests it was found that the scatter of the shear strength was much higher for the specimens with natural aggregates compared with crushed aggregates. The same tendency was found for the shear crack initiation load for the RC beams. The percentage of fractures propagating through aggregate, paste and the ITZ varied with w/c, type of aggregate and type of failure. Microscopy in combination with DIC and AE measurements makes it possible to determine at what stage different cracks have been formed and their relation to the micro structure.

  • 24.
    Flansbjer, Mathias
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Löfgren, I
    Forbes Olesen, J
    The WST-Method for Fracture Testing of Fibre-reinforced Concrete2005Rapport (Refereegranskat)
  • 25.
    Flansbjer, Mathias
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Magnusson, Jonas
    System design of Dome plug. Mechanical properties of rock-concrete interface2014Rapport (Refereegranskat)
  • 26.
    Flansbjer, Mathias
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Malaga, Katarina
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Blanksvärd, Thomas
    Petersson, Örjan
    Textile reinforced concrete sandwich panels2012Ingår i: fib Symposium 2012: Concrete Structures for Sustainable Community - Proceedings, 2012, , s. 169-172Konferensbidrag (Refereegranskat)
  • 27.
    Flansbjer, Mathias
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Malaga, Katarina
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Tammo, Kristian
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Blanksvärd, Thomas
    Alternative anchorage systems for textile reinforced concrete elements.2013Ingår i: First International Conference on Concrete Sustainability. Tokyo. 2013-05-27--29, JCI , 2013Konferensbidrag (Övrigt vetenskapligt)
  • 28.
    Flansbjer, Mathias
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Malaga, Katarina
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Williams Portal, Natalie
    Dias Ferreira Da Silva, Nelson
    Mueller, Urs
    Larraza, Inigo
    Chozas, Valle
    Vera, Jose
    Reactive powder concrete for facade elements – A sustainable approach2015Ingår i: VII International Congress on Architectural Envelopes. San Sebastian-Donostia, Spain. 2015-05-27--29, 2015Konferensbidrag (Övrigt vetenskapligt)
  • 29.
    Flansbjer, Mathias
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Silfwerbrand, Johan
    Lindqvist, Jan-Erik
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Brandteknik, material (BRm).
    Zandi Hanjari, Kamyab
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Structural analysis of concrete members with shear failure2012Ingår i: fib Symposium 2012: Concrete Structures for Sustainable Community - Proceedings, 2012, , s. 165-168Konferensbidrag (Refereegranskat)
  • 30.
    Flansbjer, Mathias
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Sjögren, Torsten
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Using digital image correlation techniques and finite element models for strain-field analysis of a welded aluminium struc2011Ingår i: Applied Mechanics and Materials, ISSN 1660-9336, E-ISSN 1662-7482, Vol. 70, s. 123-128Artikel i tidskrift (Refereegranskat)
  • 31.
    Flansbjer, Mathias
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Sjögren, Torsten
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Using digital image correlation techniques and finite element models for strain-field analysis of a welded aluminium structure2011Konferensbidrag (Refereegranskat)
  • 32.
    Flansbjer, Mathias
    et al.
    RISE - Research Institutes of Sweden, Säkerhet och transport, Safety.
    Williams Portal, Natalie
    RISE - Research Institutes of Sweden, Säkerhet och transport, Safety.
    3D Analysis of Strains in Fibre Reinforced Concrete Using X-Ray Tomography and Digital Volume Correlation2017Konferensbidrag (Refereegranskat)
    Abstract [en]

    In fibre reinforced concrete (FRC), understanding the underlying interaction mechanisms between discrete fibres and the surrounding concrete matrix can lead to the optimization of the fibre-matrix combination. This paper presents the initial development of a method enabling the analysis of this given interaction on ameso-mechanical level. The method is such that volume images are initially captured using X-ray Computed Tomography (XCT) on small-scale FRC specimens under loading which are thereafter analysed to measure full 3D strainand deformation via Digital Volume Correlation (DVC). It is anticipated that the method developed in this project can be a useful tool for the developmentof new innovative and high performance FRC.

  • 33.
    Flansbjer, Mathias
    et al.
    RISE - Research Institutes of Sweden, Säkerhet och transport, Safety.
    Williams Portal, Natalie
    RISE - Research Institutes of Sweden, Säkerhet och transport, Safety.
    Hall, Stephen
    Lund University, Sweden.
    Engqvist, Jonas
    Lund University, Sweden.
    Analysis of Failure Modes in Fiber Reinforced Concrete Using X-rayTomography and Digital Volume Correlation2018Konferensbidrag (Refereegranskat)
    Abstract [en]

    Pull-out mechanisms for different common steel fibers were investigatedusing adapted pull-out tests performed in-situ in an x-ray micro tomograph(µXRT). High-resolution volume images from the µXRT scans enable clearvisualization of aggregates, pores, the fiber and the fiber-matrix interface.Furthermore, the natural density speckle pattern from aggregate distributionand pores was found suitable for Digital Volume Correlation (DVC) analysis.From the DVC results it was possible to visualize and quantify the straindistribution in the matrix around the fiber at the different load levels up tofinal failure, being marked by either pull-out or fiber rupture. This studydemonstrates that strain measurements within the concrete matrix can beobtained successfully using µXRT imaging and DVC analysis, which leads to anincreased understanding of the interaction mechanisms in fibre reinforcedconcrete under mechanical loading.

  • 34.
    Flansbjer, Mathias
    et al.
    RISE - Research Institutes of Sweden, Säkerhet och transport, Safety.
    Williams Portal, Natalie
    RISE - Research Institutes of Sweden, Säkerhet och transport, Safety.
    Hall, Stephen
    Lund University, Sweden.
    Engqvist, Jonas
    Lund University, Sweden.
    Analysis of Fiber-matrix Interaction in FRC using X-ray Tomography and Digital Volume Correlation2019Ingår i: proc. of 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures (FraMCoS-X), Bayonne, France: International Association of Fracture Mechanics for Concrete and Concrete Structures , 2019, , s. 8Konferensbidrag (Refereegranskat)
    Abstract [en]

    Fiber pull-out is generally considered to be the dominating failure mechanism in fiber reinforced concrete (FRC). Accordingly, pull-out tests are typically performed to characterize the fiber-matrix interaction. However, little direct insight can be gained on the actual mechanisms ofthe pull-out from such a test. Deeper understanding could however be gained through the addition of non-destructive techniques to pull-out tests to enable the visualization and quantification of the mechanical interaction. Pull-out mechanisms for different common steel fibers were investigated using adapted pull-out tests performed in-situ in an X-ray micro tomography (µXRT). High resolution volume images from the µXRT scans enable clear visualization of aggregates, pores, fiber and fiber-matrix interface. Furthermore, the natural density speckle pattern from aggregate distribution and pores was found to be suitable for Digital Volume Correlation (DVC) analysis. From the DVC results it was possible to visualize and quantify the strain distribution in the matrix around the fiber at different load levels up to final failure, being marked by either pull-out or fiber rupture. The load transfer mechanism was initially dominated by shear along the fiber. As the load increased, slip occurred in the end-hook region and mechanical locking became the governing mechanism. This study demonstrates that strain measurements within the concrete matrix and passive end-slip can be obtained successfully using µXRT imaging and DVC analysis, which leads to an increased understanding of the interaction mechanisms in fiber reinforced concrete under mechanical loading.

  • 35.
    Flansbjer, Mathias
    et al.
    RISE - Research Institutes of Sweden, Säkerhet och transport, Safety.
    Williams Portal, Natalie
    RISE - Research Institutes of Sweden, Säkerhet och transport, Safety.
    Vennetti, Daniel
    RISE - Research Institutes of Sweden, Säkerhet och transport, Safety.
    Verification of the structural performance of textile reinforced reactive powder concrete sandwich facade elements2019Ingår i: Applied Sciences, E-ISSN 2076-3417, Vol. 9, nr 12, artikel-id 456Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    As a part of the SESBE (Smart Elements for Sustainable Building Envelopes) project, non-load bearing sandwich elements were developed with Textile Reinforced Reactive Powder Concrete (TRRPC) for outer and inner facings, Foam Concrete (FC) for the insulating core and Glass Fiber Reinforced Polymer (GFRP) continuous connectors. The structural performance of the developed elements was verified at various levels by means of a thorough experimental program coupled with numerical analysis. Experiments were conducted on individual materials (i.e., tensile and compressive tests), composites (i.e., uniaxial tensile, flexural and pull-out tests), as well as components (i.e., local anchorage failure, shear, flexural and wind loading tests). The experimentally yielded material properties were used as input for the developed models to verify the findings of various component tests and to allow for further material development. In this paper, the component tests related to local anchorage failure and wind loading are presented and coupled to a structural model of the sandwich element. The validated structural model provided a greater understanding of the physical mechanisms governing the element's structural behavior and its structural performance under various dead and wind load cases. Lastly, the performance of the sandwich elements, in terms of composite action, was shown to be greatly correlated to the properties of the GFRP connectors, such as stiffness and strength

  • 36.
    Flansbjer, Mathias
    et al.
    RISE - Research Institutes of Sweden, Säkerhet och transport, Safety.
    Williams Portal, Natalie
    RISE - Research Institutes of Sweden, Säkerhet och transport, Safety.
    Vennetti, Daniel
    RISE - Research Institutes of Sweden, Säkerhet och transport, Safety.
    Mueller, Urs
    RISE - Research Institutes of Sweden, Samhällsbyggnad, CBI Betonginstitutet.
    Composite Behaviour of Textile Reinforced Reactive Powder Concrete Sandwich Façade Elements2018Ingår i: International Journal of Concrete Structures and Materials, ISSN 1976-0485, E-ISSN 2234-1315, Vol. 12, nr 1, artikel-id 71Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Within the EC funded project smart elements for sustainable building envelopes, carbon textile reinforcement was incorporated into reactive powder concrete, namely textile reinforced reactive powder concrete (TRRPC), to additionally improve the post-cracking behaviour of the cementitious matrix. This high-performance composite material was included as outer and inner façade panels in prefabricated and non-load bearing sandwich elements along with low density foamed concrete (FC) and glass fibre reinforced polymer continuous connecting devices. Experiments and finite element analysis (FEA) were applied to characterize the structural performance of the developed sandwich elements. The mechanical behaviour of the individual materials, components and large-scale elements were quantified. Four-point bending tests were performed on large-scale TRRPC-FC sandwich element beams to quantify the flexural capacity, level of composite action, resulting deformation, crack propagation and failure mechanisms. Optical measurements based on digital image correlation were taken simultaneously to enable a detailed analysis of the underlying composite action. The structural behaviour of the developed elements was found to be highly dependent on the stiffness and strength of the connectors to ensure composite action between the two TRRPC panels. As for the FEA, the applied modelling approach was found to accurately describe the stiffness of the sandwich elements at lower load levels, while describing the stiffness in a conservative manner after the occurrence of connector failure mechanisms. © 2018, The Author(s).

  • 37.
    Jacobsson, Lars
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Flansbjer, Mathias
    Borehole KFM01D Shear tests on sealed joints. Forsmark site investigation2006Rapport (Refereegranskat)
  • 38.
    Jacobsson, Lars
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Flansbjer, Mathias
    Borehole KFM05A. Normal stress test with direct and indirect deformation measurement together with shear tests on joints. Forsmark site investigation2005Rapport (Refereegranskat)
  • 39.
    Jacobsson, Lars
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Flansbjer, Mathias
    Borehole KFM06A. Normal loading and shear tests on joints. Forsmark site investigation2005Rapport (Refereegranskat)
  • 40.
    Jacobsson, Lars
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Flansbjer, Mathias
    Borehole KFM08A. Normal loading and shear tests on joints. Forsmark site investigation2005Rapport (Refereegranskat)
  • 41.
    Jacobsson, Lars
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Flansbjer, Mathias
    Borehole KFM09A Normal loading and shear tests on joints. Forsmark site investigation2006Rapport (Refereegranskat)
  • 42.
    Jacobsson, Lars
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Flansbjer, Mathias
    Borehole KLX03A. Normal loading and shear tests on joints. Oskarshamn site investigation2005Rapport (Refereegranskat)
  • 43.
    Jacobsson, Lars
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Flansbjer, Mathias
    Borehole KLX06A. Normal loading and shear tests on joints. Oskarshamn site investigation2005Rapport (Refereegranskat)
  • 44.
    Jacobsson, Lars
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Flansbjer, Mathias
    Borehole KLX07A. Shear tests on sealed joints. Oskarshamn site investigation2006Rapport (Refereegranskat)
  • 45.
    Jacobsson, Lars
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Flansbjer, Mathias
    Borehole KLX10. Normal loading and shear tests on joints. Oskarshamn site investigation2006Rapport (Refereegranskat)
  • 46.
    Jacobsson, Lars
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Flansbjer, Mathias
    Borehole KLX12A. Normal loading and shear tests on joints. Oskarshamn site investigation2006Rapport (Refereegranskat)
  • 47.
    Jacobsson, Lars
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Flansbjer, Mathias
    Borehole KLX13A. Shear tests on sealed joints. Oskarshamn site investigation2006Rapport (Refereegranskat)
  • 48.
    Jacobsson, Lars
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Flansbjer, Mathias
    Äspö Pillar Stability Experiment. Samples from TASQ tunnel at Äspö HRL. Normal loading and shear tests on joints2005Rapport (Refereegranskat)
  • 49.
    Jacobsson, Lars
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Flansbjer, Mathias
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Andersson, Lars
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Appelquist, Karin
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Normal Loading and Shear Tests on Rock2016Rapport (Övrigt vetenskapligt)
  • 50.
    Jacobsson, Lars
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Flansbjer, Mathias
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Andersson, Lars
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Appelquist, Karin
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Normal Loading and Shear Tests on Rock Joints from Olkiluoto2016Rapport (Övrigt vetenskapligt)
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