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坑砂一直被用于制作下水管的密实填充料。然而这类密实砂质填料易被渗漏流所冲蚀,从而导致路基下沉并使冲出的砂石流入下水道中,另外,酸性土壤和渗透到地下的氯化物也会引起下水管的腐蚀。因此开发一种新型的流动性好的填料以取代传统砂石很有必要。 在美国,受控低强度材料,即人们所熟知的易流动填料、控制密度填料等,已经证明可适用于管道垫层、填隙和控制侵蚀等。与传统砼相比,这些易流动填料的抗压强度较低,因而混合物的耐久性就不能和砼相提并论,但作为回填料还是能满足预期要求的。并且对易流动的
Pit sand has always been used to make dense packing materials for sewage pipes. However, this kind of dense sand filler is easily eroded by the leakage flow, which causes the subgrade to sink and the rushed sand into the sewer. In addition, acidic soils and chlorides that penetrate into the ground can also cause corrosion of the sewage pipes. . Therefore, it is necessary to develop a new type of fluidity filler to replace the traditional sand. In the United States, controlled low-strength materials, known as easy flow fillers, controlled density fillers, etc., have been shown to be suitable for pipe cushioning, caulking, and controlled erosion. Compared with conventional crucibles, these flowable fillers have lower compressive strength, so the durability of the mix cannot be compared with that of plutonium, but it can still meet the expected requirements as a backfill. And for easy flow