Experimental Study on the Dry Shrinkage Properties of Nano Concrete Materials

This paper focuses on the effect of adding nano-CaCO3 and nano-SiO2 to concrete with different dosages on its shrinkage performance, studies have shown that: nano materials on the drying shrinkage of concrete will produce certain negative effect, make the drying shrinkage of concrete increases, so need through the selection of the aggregate, the optimization of mixture ratio and effective maintenance means to reduce the drying shrinkage of concrete, such as the nano materials minimizes the negative effect on the drying shrinkage of concrete; In this paper, the effects of two kinds of nano materials on concrete properties are comprehensively compared. The results show that the improvement of mechanical properties and durability of concrete by NS is slightly better than that of NC under the appropriate dosage, but the selling price of NC is much lower than that of NS. Besides, the fluidity of concrete after adding NC is better than that of concrete mixed with NS, and the drying shrinkage rate of concrete at each age is lower.