Now, people in order to build a house, need a lot of sand, the results of a lot of river bed dig deep, and destroyed the environment. Why can not you substitute sand in the desert? Where the number of sand with how much, you can also move directly with the machine, rather than dig out and then transported.
When the flow of concrete mixture requirements are certain, it is clear that the use of coarse sand than the required sand slurry for the province, and hardened cement content less, can improve the density of concrete, but the coarse sand, and make concrete The mixture is easy to produce segregation, bleeding phenomenon, affecting the uniformity of concrete, so mixed with concrete sand, should not be too small, it should not be too thick
In the concrete, the surface of the sand is wrapped by the cement slurry, the larger the total surface area of the sand, the more the required cement slurry
Desert sand is too fine the smaller the particle size, the larger the total surface area
