Housing construction, the sand, sand, sand and the relationship between the difference
Sand is not sanding sand, which contains a lot of impurities, not directly for the project in the concrete, with the cement molecules can be combined to increase the diffusion of cement molecules, the formation of cement slurry, to enhance the hydration of cement fill the gap between the stone particles, together with the stone together to play a skeleton role, improve the density and strength of concrete has a certain role in the lubrication of concrete to improve the workability in the cement hydration process, effectively reduce the cement hydration heat, inhibit the physical and chemical reaction volume changes when the cracks in all kinds of mortar play a role in aggregate, and can effectively save cementing materials in the expansive soil, frozen soil and other poor soil layer as a cushion, played a protective role
Clean sand refers to the sand after sieving, can be used directly for the project
Sand and sand are the key: the appearance and grain gradation; sand, natural, washed by water after the particles, the appearance of rounded, more clean, evenly ordered particles; sand, should be commonly known as the local, Its appearance is rough, with a large amount of mud, grain gradation thick; sand washing, the Department of sand: the appearance of rough, angular, and more containing more processing stone powder
