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  • Effect of severe chloride environment on the flexural behaviour of hybrid concrete systems
    Mag. Concr. Res. (IF 2.088) Pub Date : 2020-06-26
    Luaay Hussein; Lamya Amleh; Hocine Siad; Mohamed Lachemi

    This paper reports an investigation into the effect of a severe chloride environment on the flexural behaviour and microstructure of concrete composites combining normal- or high-strength concrete and ultra-high-performance fibre-reinforced concrete (UHPFRC). The normal- or high-strength concrete layers were used in the compression area while the UHPFRC, with three different fibre contents (1, 1·5

    更新日期:2020-06-30
  • Watching the bonding between steel rebar and concrete with in situ X-ray imaging
    Mag. Concr. Res. (IF 2.088) Pub Date : 2020-06-26
    Rudney Bostel; Ana Carolina Parapinski Dos Santos; Joao Bernardino Lopes; Fabio Luiz Willrich; Marcelo Goncalves Hönnicke

    Pull-out tests combined with an in situ radiographic movie are presented in order to investigate bond properties between steel rebar and concrete during tests on concrete reinforcement samples. Rebar relative displacement and other theoretically anticipated properties during the loading process, such as regions inside the concrete with maximum compression and longitudinal cracks, could be visualised

    更新日期:2020-06-30
  • Influence of bond property of longitudinal bars on seismic behaviour of reinforced-concrete columns
    Mag. Concr. Res. (IF 2.088) Pub Date : 2020-06-26
    Junhua Wang; Yuping Sun

    Four circular fly-ash concrete columns reinforced by steel rebars with different bond levels were tested to investigate the influence of bond strength of longitudinal steel rebar on the seismic behaviours of reinforced-concrete (RC) members. Furthermore, a fibre-element method considering steel bond slip was used to investigate the influence of bond properties of steel rebar on seismic responses of

    更新日期:2020-06-30
  • Bond model of 15·2 mm strand with consideration of concrete creep and shrinkage
    Mag. Concr. Res. (IF 2.088) Pub Date : 2020-06-26
    Rahman S. Kareem; Ahmed Al-Mohammedi; Canh N. Dang; José R. Martí-Vargas; William Micah Hale

    The bond between prestressing strands and concrete in the transfer zone of pretensioned concrete members is a complicated mechanism. Concrete creep and shrinkage are dominant time-dependent factors that affect the strand bond. In this study, a semi-analytical bond stress–slip model was developed, based on test results of the standard test for strand bond for 15·2 mm strands. Effects of concrete creep

    更新日期:2020-06-30
  • Deformations of reinforced-concrete beam–column joint assemblies
    Mag. Concr. Res. (IF 2.088) Pub Date : 2020-06-10
    Jung-Yoon Lee; Jongwook Park; Changhyuk Kim

    Beam–column joints are generally recognised as critical regions in the analysis and design of moment-resisting reinforced-concrete (RC) frames subjected to both lateral and vertical loads. Such joints should be designed and detailed to ensure that they have adequate overstrength and allow adjacent beams to reach their full ductile capacities. To develop an improved method for predicting the deformation

    更新日期:2020-06-10
  • Parametric study on bond of GFRP bars in alkali-activated cement concrete
    Mag. Concr. Res. (IF 2.088) Pub Date : 2020-06-10
    Biruk Hailu Tekle; Amar Khennane

    Bond behaviour plays an important role in the design and performance of reinforced-concrete structures. In this study, finite-element modelling is used to perform a parametric study. The bond between the glass fibre-reinforced polymer (GFRP) bar and alkali-activated cement concrete is modelled by surface-based cohesive behaviour. The accuracy of the model is validated by comparing model predictions

    更新日期:2020-06-10
  • A multi-variable study of factors affecting the complex resistivity of conductive mortar
    Mag. Concr. Res. (IF 2.088) Pub Date : 2020-06-10
    Stephen Davey; Kevin Paine; Manuchehr Soleimani

    Twenty-four mortar mixes were tested to assess the effects of mix design factors on complex electrical resistivity. Of these mixes, six were conventional and 18 were conductive mixes, containing varying quantities of either graphite or carbon fibre powder additions, which have been shown in previous studies to reduce the resistivity of cementitous materials. Complex resistance measurements from 20 Hz

    更新日期:2020-06-10
  • Mechanical and durability properties of magnesium silicate hydrate binder concrete
    Mag. Concr. Res. (IF 2.088) Pub Date : 2020-06-10
    Hung Tran; Allan Scott; Rajesh Dhakal

    Mechanical and durability properties of concrete made with magnesium–silicate–hydrate (M–S–H) binder systems were tested in comparison with Portland cement. The M–S–H binary binder system included 60% magnesium oxide (MgO) and 40% silicon oxide (SiO2), while the ternary system replaced 10% of the M–S–H binder with 10% crushed quartz filler. It was found that the compressive strength of M–S–H concrete

    更新日期:2020-06-10
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