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利用再生骨料制备透水混凝土,具有良好的生态效应和社会效益。本试验采用附加水量法,按不同净浆水灰比及净浆对骨料空隙的填隙系数配制一系列试样,观察无砂透水混凝土试样的积浆情况并测试抗压强度。试验发现,净浆水灰比偏大时易造成透水混凝土积浆堵孔,水灰比偏小时则成型效果差,两种情况均对强度不利。透水混凝土属于骨架空隙结构,强度与灰水比的关系不符合鲍罗米公式。在不积浆条件下,净浆强度与流动性矛盾达到平衡时的水灰比为最佳水灰比(约0.30),此时试样不易积浆且强度达到最高(10.2MPa)。透水平衡时,每平方米地面透水流量将近0.3m~3/min,将在海绵城市系统中发挥很好的调蓄作用。
The use of recycled aggregate preparation of pervious concrete, has a good ecological effect and social benefits. In this experiment, a series of samples were prepared according to the different water-cement ratio and the interstitial coefficient of the aggregate to the void of the aggregate. The grouting condition of the non-water-permeable concrete specimens was observed and the compressive strength was tested. It was found that when the ratio of the water-cement paste is too large, it is easy to cause blockage of pervious concrete grout. When the water-cement ratio is too small, the molding effect is poor, and both cases are unfavorable to the strength. Permeable concrete is a skeleton void structure, the relationship between strength and gray water ratio does not comply with Bowron formula. Under the condition of no accumulation of slurry, the optimum ratio of water to cement (about 0.30) is obtained when the contradiction between the strength and the fluidity of the paste reaches equilibrium. At this time, the sample is hard to be grouted and the strength reaches the highest (10.2 MPa). Water permeable balance, per square meter of ground permeable flow nearly 0.3m ~ 3 / min, will play a good role in the sponge city system regulation and storage.