Experimental Study on the Effect of Fly Ash Content on Shrinkage Performance of Concrete
In order to study the effect of fly ash on shrinkage performance of concrete,concrete with different fly ash content was tested for shrinkage performance,and its mechanism was analyzed by SEM test and XRD test.The results show that fly ash can effectively inhibit the shrinkage and deformation of concrete,and the higher the fly ash content,the more obvious the inhibition effect.Compared with ordinary con-crete,the specimens with 30%fly ash content reduced their self-shrinking deformation by 31.74%at 72 h.At 180 d,the dry shrinkage de-formation of the specimen with 30%fly ash content was reduced by 23.87%.Through SEM and XRD tests,it is found that fly ash can produce more C-S-H gel by secondary reaction with basic substances inside concrete,so as to improve the performance of concrete.
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