Meso-Research on Frost Resistance of Recycled Thermal Insulation Concrete

Abstract

Abstract: Due to the addition of recycled coarse aggregate and glazed hollow bead insulation aggregate, the complex pore structure is formed in recycled aggregate thermal insulation concrete (RATIC). In order to further reveal the deterioration mechanism of recycled thermal insulation concrete caused by freeze-thaw action, the crack development law and pore characteristics of RATIC specimens with different replacement rates of recycled coarse aggregate under freeze-thaw action were analyzed by CT scanning microscopic test based on the macro test. The test results show that the interface transition zone between new and old cement mortar is the weak link of RATIC under freeze-thaw cycles, and most cracks in the specimens originate from the interface transition zone between new and old cement mortar. The relative porosity of specimens is the best index to quantitatively reflect the internal failure law of RATIC specimens.

Key words: recycled aggregate thermal insulation concrete, freeze-thaw cycle, replacement rate of recycled coarse aggregate, frost resistance, meso-research

CLC Number:

TU528.01

WANG Xianxing, LIU Yuanzhen, ZHAO Yu, DAI Xiaowei. Meso-Research on Frost Resistance of Recycled Thermal Insulation Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(11): 3601-3607.

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