RESEARCH ON IMPROVING EARLY SHRINKAGE PERFORMANCE OF C50 CONCRETE WITH INTERNAL CURING AGENT
In order to control the shrinkage and development of cracks caused by volume shrinkage during the curing process of concrete,the improvement of early shrinkage performance of C50 concrete was analyzed by adding internal curing agents,that based on the commonly used and widely used C50 concrete in construction and road and bridge engineering.The results show that pre wetted SAP has good filling and nucleation effects,which can significantly improve the early strength and autogenous shrinkage of concrete.Increasing the pre wetting water content can increase the SAP particle size and weaken their filling and nucleation effects,that result in a decrease in compressive strength and an increase in drying shrinkage of concrete.The pre wetting water content of 9.4 kg/m3r has little effect on the compressive strength of C50 concrete,and can significantly improve the concrete volume stability.It can be seen that the reasonable use of internal curing agents can effectively improve the early shrinkage performance of C50 concrete.
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