预处理再生骨料混凝土的干燥收缩和弯拉强度研究

Study on Drying Shrinkage and Flexural Strength of Concrete with Pretreated Recycled Aggregate

分别采用复合胶凝材料净浆和渗透结晶材料对再生骨料进行预处理,研究了不同天然骨料取代率对再生骨料混凝土的干燥收缩和弯拉强度的影响规律。结果表明,在取代率不大于30%的前提下,天然骨料取代率对再生骨料混凝土的干燥收缩和弯拉强度影响不显著,干燥收缩增加值不超过10%、弯拉强度降低值不超过10%;同等条件下,再生骨料渗透结晶材料预处理优于复合胶凝材料净浆预处理。

Composite cementitious paste and infiltration crystallization material were used to pretreat recycled aggregate,respectively,and the influences of different natural aggregate replacement rates on the drying shrinkage and flexural strength of recycled aggregate concrete were studied.The results show that under the premise that the replacement rate is not more than 30%,the aggregate replacement rate has no significant effect on the drying shrinkage and flexural strength of the recycled aggregate concrete;the increase in drying shrinkage of recycled aggregate concrete is no more than 10%,and the flexural strength reduction is no more than 10%.Under the same conditions,the pretreatment effect of infiltration crystallization material is better than that of composite cementitious paste.