Introduction
Bimonthly, started in 1957
Administrator
Shanxi Provincial Education Department
Sponsor
Taiyuan University of Technology
Publisher
Ed. Office of Journal of TYUT
Editor-in-Chief
SUN Hongbin
ISSN: 1007-9432
CN: 14-1220/N
Administrator
Shanxi Provincial Education Department
Sponsor
Taiyuan University of Technology
Publisher
Ed. Office of Journal of TYUT
Editor-in-Chief
SUN Hongbin
ISSN: 1007-9432
CN: 14-1220/N
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home> Online First
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Numerical Analysis of Damage and Deterioration of Recycled Aggregate Concrete Mixed with Glazed Hollow Beads after High
DOI:
10.16355/j.tyut.1007-9432.20220664
abstract:
In recent years, with the frequent occurrence of building fires, the problem of the degradation of concrete macro-scale mechanical properties, resulted from the damage and deterioration of the internal micro-scale structure due to high temperature, has attracted widespread attention. The internally porous and highly thermally stable glazed hollow beads (GHB) can reduce the high temperature damage and deterioration of concrete to a certain extent, and improve the fire resistance of concrete. In order to further clarify the mechanism of GHB in improving the fire resistance of concrete, starting from the meso-scale concrete, this study firstly proposed a modeling method for RATIC meso-scale model that can take into account the initial defects and the replacement rate of recycled coarse aggregate (RCA). Afterwards, the effects of RCA replacement rates (0, 50%, 100%), GHB contents (0, 70%, 100%), and porosity (0, 2%, 4%) on the mechanical properties of RATIC after high temperature were explored by utilizing the plastic damage model which was commonly used at this stage. The results show that with the increase of the fire temperature, the damage distributions of the RATIC specimens under the load exhibit a gradually increasing trend, and the damage distribution of the specimens after 500
℃is more serious than that before 400℃. The addition of GHB alleviates the damage and deterioration inside the concrete to a certain degree, while the addition of RCA exacerbates this phenomenon. In addition, the strength of RATIC specimens gradually decreases with the increase of porosity.
Keywords:
Recycled aggregate concrete mixed with glazed hollow beads; random aggregate model;uniaxial compression; high temperature; porosity