透水混凝土制备及抗堵塞性能的研究

摘要

以建筑混凝土废弃物破碎制成的再生骨料为骨架、以普通硅酸盐水泥和强凝胶为胶凝材料,添加少量高性能减水剂和一定量的短切纤维,制备再生骨料透水混凝土.试验结果表明:1、再生骨料透水混凝土比碎石或卵碎石骨料透水混凝土的耐磨性、抗压强度及抗弯拉强度略低,透水系数介于两者之间;单一粒级堵塞剂滞留在再生骨料透水混凝土表面的占比也介于另外两种透水混凝土之间,且透水恢复比比较低;2、短切纤维掺量增加,再生骨料透水混凝土的耐磨性、抗压强度及抗弯拉强度升高,透水系数降低;单一粒级堵塞剂随着纤维添加量增加更容易滞留于再生骨料透水混凝土表面,经冲洗表面透水恢复比比较高.%Pervious recycled aggregate concrete was prepared by the recycled aggregate crushed by construction waste as the skeleton,adding the ordinary Portland cement and strong gel as gelled material,and adding a small amount of high performance water reducing agent and a certain amount of shot-cut fiber.Results showed that:1.Compared with pervious gravel concrete or pervious broken pebbles concrete,pervious recycled aggregate concrete has a bit lower abrasion resistance,compressive strength and flexural strength,while the value of permeability coefficient is between the above two samples.The content of single particle size blockage staying on the surface of the pervious recycled aggregate concrete is also between the pervious gravel concrete and the pervious broken pebbles concrete,and the permeability coefficient recovery ratio is lower.2.With the increasing of content of short-cut fiber,the abrasion resistance,compressive strength and flexural strength of pervious recycled aggregate concrete increases,and the permeability coefficient decreases.The single particle size blockage is more easily to stay on the surface of the pervious recycled aggregate concrete with the increase of fiber content.And the permeability coefficient recovery ratio of pervious recycled aggregate concrete is higher after washing.