Influence of Stone Powder on Properties of Concrete with Low Cementitious Materials

With the growing shortage of natural sand, mechanism sand become an important source of sand. And the large amount of low quality is a common phenomenon of the mechanism sand, which mainly reflecting in its bad gradation and grain shape and the results will lead to the cementitious materials and water consumed greatly. The influence of stone powder of high quality mechanism sand on C30 concrete properties is studied. The results show that the proper amount of stone powder could improve the gradation of mechanism sand, increase the paste volume and fill in the void among particles. The workability, compressive strength, permeability and frost resistance of the mechanism sand concrete will be improved on the basis of the content of stone powder, and the optimum range of stone powder content of mechanism sand is 9% to 15% for the C30 concrete. (paper)