The mix proportion design of pervious concrete with different aggregate gradation was carried out by volume method,and the porosity of control test group was kept the same.Test the compressive strength of the pervious concrete 28 d,and combined with the failure characteristics of block,the result showed with the increase of small particle size aggregate content,the overall compressive strength increased,the compressive strength which 5~10 mm aggregate content is 75% was 34.06% higher than which 5~10 mm aggregate content is 25% .With the increase of fine aggregate content,in pervious concrete compression,the phenomenon of stress concentration that happened to the end or corner was reduced,and the block bearing surface area stably increased,so that the compressive strength of pervious concrete can be improved,the highest compressive strength was up to 18.5 MPa.Therefore,permeable concrete should be selected the packed dense aggregate to ensure its uniform strength and spatial distribution.%采用体积法进行不同骨料级配透水混凝土的配合比设计,控制试验组的孔隙率保持相同.测试透水混凝土28 d抗压强度,并结合试块破坏的特征,分析得出:随着小粒径骨料含量的增多,抗压强度总体增高,5~10 mm骨料含量为75%的抗压强度比含量为25%高34.06%;随着细小骨料含量的增多,透水混凝土受压时端部或角部的应力集中现象减弱,而试块承压面面积趋于稳定增大,从而使透水混凝土的抗压强度得以提高,抗压强度最高时可达18.5 MPa.因此透水混凝土宜采用堆积比较密实的小粒径骨料以保证其强度空间分布均匀.
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