再生骨料透水混凝土抗压性能及透水性能试验研究

通过掺30%再生骨料和未掺再生骨料两种透水混凝土的抗压性能及透水性能对比试验,研究了水灰比、骨料粒径、砂率等因素对其抗压性能和透水性能的影响,确定了按体积法配制的合理性和最佳配合比。试验结果表明,采用5~10mm的骨料粒径、水灰比为0.3和目标孔隙率为15%时,掺30%再生骨料和未掺再生骨料两种透水混凝土抗压强度分别达到18.0MPa和19.2MPa,且透水系数均大于5mm/s。基于上述试验结果,分析了掺30%再生骨料和未掺再生骨料两种透水混凝土孔隙率与透水系数及抗压强度之间的关系,表明它们之间存在着相关性良好的函数关系,即可以通过调整孔隙率的大小来平衡抗压强度与透水系数,使之均满足实际工程要求。

Experimental Study of Compressive and Permeable Performance of Permeable Concrete with Recycled Aggregate

Through comparative experiment of compressive and permeable properties of two kinds permeable concrete (with or without 30％ recycled aggregate),the effect of water-cement ratio,aggregate particle diameter,and sand ratio on the compressive and permeable properties was studied,the rationality of mixture preparation by volume was validated,the optimal mixing proportion was determined.Experimental results indicate that when aggregate particle diameter in a range of 5 ～ 10mm,water-cement ratio is 0.3 and target porosity is 15％,the compressive strength of two types of permeable concrete (with or without 30％ recycled aggregate) can reach 18.0MPa and 19.2MPa respectively,and both permeation coefficients are larger than 5mm/s.Based on above experimental results,the relation among porosity,permeation coefficient and compressive strength of two types of permeable concrete (with or without 30％ recycled aggregate) was analyzed.There are good function relations among these factors,which indicates that through controlling porosity,both compressive strength and permeation coefficient can be adjusted to meet the engineering requirements.