陶泥对混凝土抗冻性能影响

摘要

为探讨陶泥作为辅助胶凝材料对混凝土抗冻性能的影响,采用快冻法进行混凝土抗冻试验.设计两类混凝土,即未掺引气剂和掺引气剂,每类中分别包含12组混凝土,其中,基准混凝土1组,陶泥和粉煤灰分别取代水泥10%,20%,30%,40%的混凝土各4组;陶泥和粉煤灰共同取代水泥( 10%(陶泥)+20%(粉煤灰) ,20%(陶泥)+10%(粉煤灰) ,20%(陶泥)+20%(粉煤灰) )的混凝土3组.试验结果表明:未掺引气剂时,以陶泥取代水泥量30%的混凝土抗冻性能最佳,其他取代量的混凝土抗冻性能与基准混凝土抗冻性能相当;取代水泥量为20%时,陶泥混凝土抗冻性能略低于粉煤灰混凝土抗冻性能,其他取代量时,陶泥混凝土抗冻性能与粉煤灰混凝土抗冻性能相当;复掺陶泥和粉煤灰的混凝土的抗冻性能与相同取代量的单掺陶泥或粉煤灰的混凝土的抗冻性能相当;掺加引气剂可以显著提高陶泥混凝土的抗冻性能.故陶泥取代水泥后,混凝土抗冻性没有降低,并且在某些取代量时有所提高.%The paper discussed the effects of ceramic polishing powder, a type of supplementary cementing material, on concrete frost resistance. More specifically, two kinds of concrete ( without air entraining admixture and with air entraining admixture) were developed, and for each case, there were 12 groups of concrete, including 1 group of control concrete, 4 groups of concrete mixed with ceramic polishing powder, 4 groups of concrete mixed with fly ash, and 3 groups of concrete mixed with ceramic polishing powder and fly ash simultaneously, but the cement substitution rate in each group were different. The concrete frost resistance tests were carried out, and some valuable results are obtained. Firstly, when there is not mixed air entraining admixture, the frost resistance of concrete with ceramic polishing powder is the best one, in which the substitution rate of cement with ceramic polishing powder is 30%, and with other substitution rate, the frost resistance of concrete with ceramic polishing powder is the same as that of control concrete. Secondly, when there is not mixed air entraining admixture, the frost resistance of concrete with fly ash is better than that of concrete with ceramic polishing powder, in which the substitution rate of cement with fly ash is 20%, and with other substitution rate, the frost resistance of concrete with ceramic polishing powder is the same as that of concrete with fly ash. In addition, when there is not mixed air entraining admixture, the frost resistance of concrete mixed with ceramic polishing powder and fly ash simultaneously is the same as that of concrete mixed with either. Finally, air entraining admixture can improve the frost resistance of ceramic polishing powder concrete obviously. Therefore, frost resistance of concrete mixed with ceramic polishing powder is the same as or better than that of control concrete.