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  • 351.
    Xi, Fengming
    et al.
    Chinese Academy of Sciences, China; Shenyang Jianzhu University, China.
    Davis, Steven J.
    Chinese Academy of Sciences, China; University of California, US.
    Ciais, Philippe
    LSCE Climate and Environment Sciences Laboratory, France.
    Crawford-Brown, Douglas
    LSCE Climate and Environment Sciences Laboratory, France.
    Guan, Dabo
    University of Cambridge, UK.
    Pade, Claus
    University of East Anglia, UK.
    Shi, Tiemao
    Danish Technological Institute, Denmark.
    Syddall, Mark
    Shenyang Jianzhu University, China.
    Lv, Jie
    University of Cambridge, UK.
    Ji, Lanzhu
    Shenyang Agricultural University, China.
    Bing, Longfei
    Chinese Academy of Sciences, China.
    Wang, Jiaoyue
    Chinese Academy of Sciences, China.
    Wei, Wei
    Chinese Academy of Sciences, China.
    Yang, Keun-Hyeok
    Kyonggi University, South Korea.
    Lagerblad, Björn
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB, Hållbara byggnadsverk.
    Galan, Isabel
    University of Aberdeen, UK.
    Andrade, Carmen
    Eduardo Torroja Institute for Costruction Sciences, Spain.
    Zhang, Ying
    Shenyang Pharmaceutical University, China.
    Liu, Zhu
    California Institute of Technology Pasadena, US; Harvard University, US.
    Substantial global carbon uptake by cement carbonation2016In: Nature Geoscience, ISSN 1752-0894, E-ISSN 1752-0908, Vol. 9, no 12, p. 880-883Article in journal (Refereed)
    Abstract [en]

    Calcination of carbonate rocks during the manufacture of cement produced 5% of global CO 2 emissions from all industrial process and fossil-fuel combustion in 2013. Considerable attention has been paid to quantifying these industrial process emissions from cement production, but the natural reversal of the process - carbonation - has received little attention in carbon cycle studies. Here, we use new and existing data on cement materials during cement service life, demolition, and secondary use of concrete waste to estimate regional and global CO 2 uptake between 1930 and 2013 using an analytical model describing carbonation chemistry. We find that carbonation of cement materials over their life cycle represents a large and growing net sink of CO 2, increasing from 0.10 GtC yr â '1 in 1998 to 0.25 GtC yr â '1 in 2013. In total, we estimate that a cumulative amount of 4.5 GtC has been sequestered in carbonating cement materials from 1930 to 2013, offsetting 43% of the CO 2 emissions from production of cement over the same period, not including emissions associated with fossil use during cement production. We conclude that carbonation of cement products represents a substantial carbon sink that is not currently considered in emissions inventories.

  • 352.
    Zandi Hanjari, Kamyab
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    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).
    Silfwerbrand, Johan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Structural analysis of concrete members with shear failure2012In: fib Symposium 2012: Concrete Structures for Sustainable Community - Proceedings, 2012, , p. 165-168p. 165-168Conference paper (Refereed)
    Abstract [en]

    The paper aims to improve the knowledge of the shear response in reinforced concrete and the influence of aggregate interlock using non-linear finite element analysis. The influence of aggregate types on shear response of concrete was studied with finite element analysis of reinforced concrete beams failed in shear. The influence of aggregate interlock was investigated using different smeared crack approaches, i.e. multi directional, fixed and rotating crack models. The results from analysis are verified with the result from mechanical testing with respect to stiffness, capacity and crack pattern.

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  • 353.
    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.

  • 354.
    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)
  • 355.
    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.

  • 356.
    Zandi, Kamyab
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB. Chalmers University of Technology, Sweden.
    Lundgren, K.
    Chalmers University of Technology, Sweden.
    Numerical 3D modelling of anchorage, corrosion and spalling2015In: Concrete - Innovation and Design: fib Symposium Proceedings, Technical University of Denmark , 2015, p. 331-332Conference paper (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 objective was to study the influence of corrosion-induced cover spalling on bond strength. Thus, earlier developed bond and corrosion models suited for detailed 30 fnite element (FE) analysis were first combined with a new computation scheme to simulate corrosion-induced cover spalling. The 30 FE analyses were validated through experiments. The application of 30 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 early yielding of stirrups had not taken place. Moreover, it was shown that stresses in the stirrups due to corrosion in adjacent bars rapidly diminished within a short distance fom the main bar, and that the corrosion of stirrups influenced the shear capacity more prominent than the induced stresses in stirrups due to the corrosion of main bars.

  • 357.
    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.

  • 358.
    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)
  • 359.
    Zhang, Emma Qingnan
    et al.
    Chalmers University of Technology, Sweden.
    Tang, Luping
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB, Hållbara byggnadsverk. Chalmers University of Technology, Sweden.
    Zack, Thomas
    University of Gothenburg, Sweden.
    Carbon fiber as anode material for cathodic prevention in cementitious materials2016In: International Conference on Durability of Concrete Structures (ICDCS 2016), Purdue University Press, 2016, p. 300-308Conference paper (Refereed)
    Abstract [en]

    Cathodic prevention (CPre) technique is a promising method and has been used for the past two decades to prevent steel from corrosion in concrete structures. However, wide application of this technique has been restricted due to high costs of anode materials. In order to lower the cost and further improve this technique, carbon fiber composite anode has been introduced as an alternative anode material with affordable price and other outstanding properties. This paper presents the study of using carbon fiber mesh as anode material for long-term cathodic prevention system and the effect of accelerated current on macro- And microstructure of cementitious materials. In the study, electrochemically accelerated tests were developed for the purpose of shortening the experimental time into a manageable range. An estimation tool was used to predict the service life as well. Chemical and microstructure analyses were carried out by laser-ablation inductively-coupled-plasma mass-spectroscopy (LA-ICP-MS) and scanning electron microscope (SEM). Results indicate that calcium to silicon (Ca/Si) ratio and ion re-distribution in the current-affected zone around the anode were changed due to migration and electrochemical reactions. The predicted service life was in general longer than 100 years. Based on the results from this work, it can be concluded that carbon fiber mesh is suitable for the application as anode in long-term cathodic prevention system in cementitious materials.

  • 360.
    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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  • 361.
    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)
5678 351 - 361 of 361
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