地下管廊混凝土配合比设计

Mix Proportion Design of Underground Pipe Gallery Concrete

城市地下综合管廊解决以往管线直埋造成的环境、交通问题,具有美观、环保、检修方便的优势,预制水泥混凝土管廊对工地资源占用少,制作效率高,相比工地现浇更便捷、经济。工厂预制时,骨料级配、混凝土配合比对预制水泥混凝土管廊的性能有重要影响。因此,以粒径分别为5~10mm,10~20mm,10~30mm的碎石为材料,研究骨料级配、混凝土配合比对预制管廊用水泥混凝土性能的影响。结果表明当采用碎石粒径分别为10~31.5mm(25%),10~20mm(50%),5~10mm(25%)时最优;混凝土配合比为水泥∶水∶砂∶石子∶减水剂=1∶0.36∶1.137∶2.653∶0.025。

The urban underground comprehensive pipe gallery solves the environmental and traffic problems caused by direct pipeline burying in the past.This has the advantages of beauty,environmental protection and convenient maintenance.While the prefabricated cement concrete pipe gallery occupies less resources on the construction site,has high production efficiency,is more convenient and economic than the cast-in-place construction site.Aggregate gradation and concrete mix ratio have a significant impact on the performance of prefabricated cement concrete pipe gallery during factory prefabrication.Therefore,the impact of aggregate gradation and concrete mix ratio on the properties of cement concrete for prefabricated pipe corridors is studied using crushed stones with particle sizes of 5~10 mm,10~20 mm,and 10~30 mm in this paper.The results show that the density is the best,and the stacking void ratio is the smallest when the crushed stone particle size is 10~31.5 mm(25%),10~20 mm(50%),5~10 mm(25%)cement.The mixing ratio of concrete is water∶sand∶stone∶water reducing agent=1∶0.36∶1.137∶2.653∶0.025.