TY - JOUR

T1 - 高温后再生保温混凝土损伤劣化数值分析

AU - Liu, Shuyu

AU - Miao, Yanchun

AU - Li, Minghou

AU - Li, Beibei

AU - Селютина, Нина Сергеевна

AU - Smirnov, Ivan

AU - Liu, Yuanzhen

AU - Zhang, Yu

PY - 2024

Y1 - 2024

N2 - [Purposes] 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, we 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). [Methods] 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 commonly used at curent stage. [Findings] The results show that with the increase of fire temperature, the damage distributions of the RATIC specimens under load exhibit a gradually increasing trend, and the damage distribution of the specimens after 500 °C is more serious than that before 400 °C. The addition of GHB alleviates the damage and deterioration inside the concrete to a certain extent, while the addition of RCA exacerbates this phenomenon. In addition, the strength of RATIC specimens gradually decreases with the increase of porosity.

AB - [Purposes] 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, we 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). [Methods] 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 commonly used at curent stage. [Findings] The results show that with the increase of fire temperature, the damage distributions of the RATIC specimens under load exhibit a gradually increasing trend, and the damage distribution of the specimens after 500 °C is more serious than that before 400 °C. The addition of GHB alleviates the damage and deterioration inside the concrete to a certain extent, while the addition of RCA exacerbates this phenomenon. In addition, the strength of RATIC specimens gradually decreases with the increase of porosity.

KW - High temperature

KW - Porosity

KW - Random aggregate model

KW - Recycled aggregate concrete mixed with glazed hollow beads

KW - Uniaxial compression

UR - https://tyutjournal.tyut.edu.cn/englishpaper/show-2337.html

UR - https://www.mendeley.com/catalogue/80f92ef1-7808-33eb-ad42-b0e26cdf79ea/

U2 - 10.16355/j.tyut.1007-9432.20220064

DO - 10.16355/j.tyut.1007-9432.20220064

M3 - статья

VL - 55

SP - 892

EP - 904

JO - Journal of Taiyuan University of Technology

JF - Journal of Taiyuan University of Technology

SN - 1007-9432

IS - 5

ER -