This is mainly because the stone powder in the mechanical sand plays a filling role and blocks the pores. With the increase of the content of stone powder, the pores are more and more obvious. Therefore, the smaller the permeability coefficient, the better the permeability resistance of concrete.
Of limestone powder to replace cement concrete impermeability performance study shows that the influence of the mechanism of sand stone itself does not belong to an inert material, however, it belongs to a kind of cementing material, in the midst of concrete mix played the role of micro aggregate, when the micro aggregate replace cement, cement hydration products of the corresponding reduction, concrete aggregate gap increases accordingly, This makes the compactness of concrete worse. Therefore, when limestone powder replaces cement, the permeability coefficient of concrete increases, and the impermeability becomes worse and worse. The results show that the method of adding stone powder can effectively improve the permeability resistance of concrete, and the permeability resistance is good. If the method of mixing stone powder in concrete is adopted, the impermeability of concrete will be adversely affected and the durability of concrete will decrease.
