再生骨料混凝土力学性能和耐久性的试验研究

Experimental Study on Mechanical Properties and Durability of Recycled Aggregate Concrete

通过对再生骨料混凝土(RAC)系列试验,研究了再生骨料取代量对混凝土力学性能和耐久性的影响。结果表明,RAC的力学性能随着再生骨料取代量的增加而降低,但降低幅度随龄期的延长而有所减小;在微观结构上,RAC与普通混凝土非常相近。RAC的单轴受压应力-应变曲线与普通混凝土相似。再生骨料取代率低于60%时,RAC的耐久性与普通混凝土相当。

The influence of the replacement ratio of natural aggregate by the recycled aggregate on the mechanical properties and durability of RAC is studied by testing of a series of Recycled Aggregate Concrete （RAC）. The results show that the strength of RAC decreases with the increase of the content of recycled aggregate, but the decreasing extent will become less with the prolonging of the age. The microstructure of RAC is similar to that of ordinary concrete, as the same, the uniaxial compressive stress-strain curve of RAC is similar to that of ordinary concrete too. And the durability of RAC will approach to that of ordinary concrete if the content of recycled aggregate is not more than 60%.