再生骨料混凝土高温损伤研究

High-temperature Damage of Recycled Aggregate Concrete

研究了再生骨料取代率对再生混凝土在模拟火灾温度下的外观形貌、抗压强度、质量及孔结构的影响。结果表明:由于再生骨料取自建筑废料,其骨料品质较天然骨料有所降低,导致其暴露在高温时出现密集裂缝,甚至骨料剥落。骨料取代率不大于40%和温度低于400℃时,再生混凝土仍能保持其力学强度且无质量损失。当温度大于600℃时,孔隙率显著增加,细孔比例相对降低。

Aggregate structure. effect of RA （ Recycled Aggregate） replacement ratio on the properties of RAC （ Recycled crete） was studied, including skin morphology, compressive strength and mass pore results show that there is a thick distribution of cracks or even aggregate spalling, when it is exposed to high-temperature waste. It is observed that both remained, after exposure temperature exceeds 600 content of the mieropore. is helpful in texture of RA worse than NA, which stems from construction compressive strength and mass of the concrete are significantly the replacement ratio of 40% RA. However, the elevated increasing predominately porosity and reducing the relative content of the micropore.