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采用预湿粘土质陶粒作为自养护粗集料,以其等体积的取代碎石掺入补偿收缩混凝土中,测试不同龄期的补偿收缩混凝土自由收缩的变化情况。表明在预湿陶粒自养护的作用下,A、B和C三种膨胀剂配制的补偿收缩混凝土在前4d龄期间均会出现不同程度的膨胀,而基准样出现收缩;在5-11d龄期间,补偿收缩混凝土均出现微量收缩,而基准样出现显著收缩;在12-28d龄期间补偿收缩混凝土收缩显著,但收缩量小于基准样;在28-56d龄期间补偿收缩混凝土收缩值与基准样相差无几,甚至低于基准样。
The pre-wet clay ceramic was used as self-curing coarse aggregate, and its equal volume of replacement gravel was incorporated into the compensated shrinkage concrete to test the free shrinkage of the compensated shrinkage concrete at different ages. It shows that under the effect of self-curing of pre-wetted ceramsite, the compensated shrinkage concrete formulated with three kinds of expansive agents A, B and C will expand to some extent during the first 4 days of age and the reference sample shrinks; During the period of 28-28 days, the shrinkage of shrinkage-compensated concrete was significantly smaller than that of the reference sample. During the period of 28-56 days, the shrinkage of compensated shrinkage concrete was significantly lower than that of the reference sample Almost the same, or even lower than the benchmark.