Influence of Expansive Agent on Concrete Performance in Northwest Cold Region

In this study, the effects of expansion agents on the compressive strength and frost resistance of concrete in the cold region of Northwest China were studied, and the effects of different amounts of expansion agents on the compressive strength and freeze-thaw cycle performance of concrete were analyzed experimentally, and the improvement mechanism of expansion agents on the frost resistance of concrete was revealed by combining the mass loss rate, relative dynamic elastic modulus attenuation and microstructure analysis. The results show that 10% expansion agent can improve the working properties of concrete, improve its compressive strength, and enhance the ability to resist freeze-thaw cycles. The expansion agent can effectively reduce freeze-thaw damage by compensating for shrinkage and optimizing the pore structure, thereby improving the frost resistance of concrete in the low temperature environment in the cold region of Northwest China.