再生粗、细骨料对混凝土透气性能的影响

Effect of Recycled Coarse and Fine Aggregate on Air Permeability of Concrete

采用C30混凝土制备的再生粗、细骨料对不同强度等级及不同置换率再生混凝土进行了抗透气性能试验研究.结果表明:当粗骨料为再生粗骨料、细骨料为天然砂时,再生粗骨料置换率对再生混凝土透气系数的影响较小;当粗骨料采用天然碎石时,再生细骨料置换率对再生混凝土透气系数的影响较大,其透气系数随着再生细骨料置换率增加而增大.

Recycled coarse and fine aggregates prepared by used C30 concrete was used to study the air per- meability resistance of recycled concrete with different strength grades and different replacement rate. Re- sults show that： with use of recycled coarse aggregate as coarse aggregate and natural sand as fine aggre- gate, the replacement rate of recycled coarse aggregate have little effect on air permeability coefficient of re- cycled concrete; but with use of natural gravel as coarse aggregate, the replacement rate of recycled fine ag- gregate have significant impact on air permeability coefficient of recycled concrete, its air permeability coef- ficient increases as the replacement rate of recycled fine aggregate increase.