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  • 301. Williams Portal, Natalie
    et al.
    Flansbjer, Mathias
    Alkali resistance of textile reinforcement for concrete facade panels2014In: Nordic Concrete Research, ISSN 0800-6377, Vol. 50, no 2, p. 61-64Article in journal (Refereed)
  • 302.
    Williams Portal, Natalie
    et al.
    Chalmers University of Technology, Sweden.
    Lundgren, Karin
    Chalmers University of Technology, Sweden.
    Wallbaum, Holger
    Chalmers University of Technology, Sweden.
    Malaga, Katarina
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Sustainable potential of textile-reinforced concrete2015In: Journal of materials in civil engineering, ISSN 0899-1561, E-ISSN 1943-5533, Vol. 27, no 7, article id 4014207Article in journal (Refereed)
    Abstract [en]

    The building construction industry is in need of sustainable materials and solutions. A novel building material, such as textile-reinforced concrete (TRC), could be used to meet this demand. Textile-reinforced concrete is a combination of fine-grained concrete and multiaxial textile fabrics that has been fundamentally researched over the past decade. TRC-based research has explored various facets of this composite material, such as its structural functionality, production, applicability, and design. One key aspect that is still missing, however, is a comprehensive review of the sustainable potential of this material in terms of its input–output and durability that suitably answers to requirement No. 7 of EU’s Construction Products Regulation. This article provides qualitative and quantitative evaluation of the sustainable potential and prospective development of TRC particularly reinforced by alkali-resistant (AR) glass, carbon, or basalt fibers. Based on the outcome of this evaluation, carbon textile fibers were observed to hold the optimal potential mechanical behavior; additionally, it was revealed through the conducted life-cycle assessment (LCA) that basalt had the least cumulative energy demand, whereas carbon had the least environmental impact.

  • 303.
    Yiming, Yao
    et al.
    Chalmers University of Technology, Sweden.
    Lyckfeldt, Ola
    RISE - Research Institutes of Sweden (2017-2019), Materials and Production, IVF.
    Tricoire, Aurelien
    GKN Aerospace Sweden AB, Sweden.
    Lundström, Dennis
    GKN Aerospace Sweden AB, Sweden.
    Klement, Uta
    Chalmers University of Technology, Sweden.
    Microstructure of plasma sprayed Al2O3-3wt%TiO2 coating using freeze granulated powder2016In: Journal of Materials Science and Chemical Engineering, ISSN 2327-6045, Vol. 4, no 7, p. 8-14Article in journal (Refereed)
    Abstract [en]

    This study is aiming at controlling the microstructure of plasma sprayed Al2O3-TiO2 composite coatings using freeze granulated powders. As sprayed and sintered Al2O3 + 3wt%TiO2 powders were air plasma sprayed with industry process parameters and compared with a commercial powder. The resulting coatings were investigated with respect to powder flowability, porosity and microstructure of the granules. The results showed that microstructure and melting fraction in the coatings could be tailored with the freeze granulation process and heat treatment conditions.

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  • 304.
    Zandi, Kamyab
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB. Chalmers University of Technology, Sweden.
    Corrosion-induced cover spalling and anchorage capacity2015In: Structure and Infrastructure Engineering, ISSN 1573-2479, E-ISSN 1744-8980, Vol. 11, no 12, p. 1547-1564Article in journal (Refereed)
    Abstract [en]

    The aim of this study is to enhance our understanding of anchorage capacity in reinforced concrete structures with corrosion-induced cover spalling. Our objectives were to study the influence of corrosion-induced cover spalling on bond strength, and to validate an existing one-dimensional (1D) analysis for anchorage capacity in such cases. Thus, earlier developed bond and corrosion models suited for detailed three-dimensional (3D) finite element (FE) analysis were first combined with a new computation scheme to simulate corrosion-induced cover spalling. The 1D and 3D FE analyses were validated through two types of experiments, i.e. eccentric pull-out tests and beam tests, as well as a comparison with an existing empirical model. The application of 3D FE analysis showed that the corrosion of stirrups advances the emergence of cracking and spalling, while bond strength is only slightly influenced by the corrosion of stirrups after cover spalling if yielding of stirrups has not taken place. Moreover, it was shown that stresses in the stirrups due to corrosion in adjacent bars rapidly diminished within a short distance from the main bar, and that the corrosion of stirrups influenced the shear capacity more prominently than the induced stresses in stirrups due to the corrosion of main bars.

  • 305.
    Zandi, Kamyab
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Effekterna av rostande armering kartlagda2012In: Betong, ISSN 1101-9190, no 1, p. 51-53Article in journal (Other academic)
  • 306.
    Zandi, Kamyab
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Kettil, P
    Modelling the structural behaviour of frost-damaged reinforced concrete structures2013In: Structure and Infrastructure Engineering, ISSN 1573-2479, E-ISSN 1744-8980, Vol. 9, no 5, p. 416-431Article in journal (Refereed)
    Abstract [en]

    A methodology is introduced to predict the mechanical behaviour of reinforced concrete structures with an observed amount of frost damage at a given time. It is proposed that the effects of internal frost damage and surface scaling can be modelled as changes of material and bond properties, and geometry, respectively. These effects were studied and suggestions were made to relate the compressive strength and dynamic modulus of elasticity, as the indicators of damage, to the response of the damaged concrete in compression and tension, and to the bond behaviour. The methodology was applied to concrete beams affected by internal frost damage, using non-linear finite element analyses. A comparison of the results with available experimental data indicated that the changes in failure mode and, to a rather large extent, the effect on failure load caused by internal frost damage can be predicted. However, an uncertainty was the extension and distribution of the damaged region which affected the prediction of the load capacity.

  • 307.
    Zandi, Kamyab
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Lundgren, Karin
    Three-dimensional modelling of structural effects of corroding steel reinforcement in concrete2013In: Structure and Infrastructure Engineering, ISSN 1573-2479, E-ISSN 1744-8980, Vol. 9, no 7, p. 702-718Article in journal (Refereed)
    Abstract [en]

    The effect of corrosion products flowing through cracks becomes significant when large corrosion penetrations take place in reinforced concrete structures and wide cracks develop; this is favourable, as it decreases the splitting stress around the bar. The effect becomes more important when the corrosion rate is low, such as for natural corrosion. Acorrosion model describing the expansion due to voluminous corrosive products was previously developed. The model is here extended to include the flow of corrosion products through cracks. The volume flow of corrosion products through a crack is assumed to depend on the splitting stress and the crack width. The splitting stress is evaluated from the strain in the corrosion products, and the crack width is computed from the displacements across the crack. A one-dimensional flow model is used to formulate the flow phenomenon and to estimate the volume flow of corrosion products. The extended corrosion model, applied in detailed three-dimensional non-linear finite element analyses of highly corroded eccentric pull-out specimens, resulted in more corrosion cracks with smaller crack openings, which better corresponded to measurements of the tested specimens. Moreover, the results indicated the important effect of the flow phenomenon on the bond strength.

  • 308.
    Zandi, Kamyab
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Utgenannt, Peter
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Experimental study of the material and bond properties of frost-damaged concrete2011In: Cement and Concrete Research, ISSN 0008-8846, E-ISSN 1873-3948, Vol. 41, no 3, p. 244-254Article in journal (Refereed)
  • 309.
    Åkesson, Urban
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Döse, Magnus
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Olika stenmaterials inverkan på partikelmängd från dubbdäckslitage2010In: CBI-nytt, ISSN 0349-2060, no 1, p. 2-3Article in journal (Other academic)
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  • 310.
    Ålgårdh Karlsson, Joakim
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Medicinteknik. Uppsala University, Sweden.
    Horn, Timothy
    North Carolina State University, US.
    West, Harvey
    North Carolina State University, US.
    Aman, Ronald
    North Carolina State University, US.
    Snis, Anders
    Arcam AB, Sweden.
    Engqvist, Håkan
    Uppsala University, Sweden.
    Lausmaa, Jukka
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Medicinteknik.
    Harrysson, Ola
    North Carolina State University, US.
    Thickness dependency of mechanical properties for thin-walled titanium parts manufactured by Electron Beam Melting (EBM)®2016In: Additive Manufacturing, ISSN 2214-8604, E-ISSN 2214-7810, Vol. 12, p. 45-50Article in journal (Refereed)
    Abstract [en]

    Metal powder bed additive manufacturing technologies, such as the Electron Beam Melting process, facilitate a high degree of geometric flexibility and have been demonstrated as useful production techniques for metallic parts.However, the EBM process is typically associated with lower resolutions and higher surface roughness compared to similar laser-based powder bed metal processes. In part, this difference is related to the larger powder size distribution and thicker layers normally used. As part of an effort to improve the resolution and surface roughness of EBM fabricated components, this study investigates the feasibility of fabricating components with a smaller powder size fraction and layer thickness (similar to laser based processes). The surface morphology, microstructure and tensile properties of the produced samples were evaluated. The findings indicate that microstructure is dependent on wall-thickness and that, for thin walled structures, tensile properties can become dominated by variations in surface roughness.

  • 311.
    Ödman, Sven T. A
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Betongblandningens inverkan på krympningen1969In: Byggmästaren, ISSN 0562-102X, no 6, article id 57Article in journal (Other academic)
  • 312.
    Östlund, Åsa
    et al.
    Chalmers University of Technology, Sweden.
    Idström, Alexander
    Chalmers University of Technology, Sweden.
    Olsson, Carina
    Chalmers University of Technology, Sweden.
    Larsson, Per Tomas
    RISE, Innventia. KTH Royal Institute of Technology, Sweden.
    Nordstierna, Lars
    Chalmers University of Technology, Sweden.
    Modification of crystallinity and pore size distribution in coagulated cellulose films2013In: Cellulose, ISSN 0969-0239, E-ISSN 1572-882X, Vol. 20, no 4, p. 1657-1667Article in journal (Refereed)
    Abstract [en]

    In this study the effects of altering the coagulation medium during regeneration of cellulose dissolved in the ionic liquid 1-ethyl-3-methylimidazolium acetate, were investigated using solid-state NMR spectroscopy and NMR cryoporometry. In addition, the influence of drying procedure on the structure of regenerated cellulose was studied. Complete conversion of the starting material into regenerated cellulose was seen regardless of the choice of coagulation medium. Coagulation in water predominantly formed cellulose II, whereas coagulation in alcohols mainly generated non-crystalline structures. Subsequent drying of the regenerated cellulose films, induced hornification effects in the form of irreversible aggregation. This was indicated by solid-state NMR as an increase in signal intensity originating from crystalline structures accompanied by a decrease of signal intensity originating from cellulose surfaces. This phenomenon was observed for all used coagulants in this study, but to various degrees with regard to the polarity of the coagulant. From NMR cryoporometry, it was concluded that drying induced hornification generates an increase of nano-sized pores. A bimodal pore size distribution with pore radius maxima of a few nanometers was observed, and this pattern increased as a function of drying. Additionally, cyclic drying and rewetting generated a narrow monomodal pore size pattern. This study implies that the porosity and crystallinity of regenerated cellulose can be manipulated by the choice of drying condition.

4567 301 - 312 of 312
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