In order to avoid cracking, expanding admixtures are usually added to high p er formance concrete(HPC) in construction, but the effect isn′t as obvious as expe cte d. HPC′s early strength increases rapidly, and so does its early shrinkage. Pla i n concrete expanding admixtures expand slowly, and cann′t compensate for HPC′s early shrinkage. The test studied the effects of expanding admix tures of various additive rates and fineness on HPC. The testing result shows that finer expanding admixtures co mpensate better for HPC′s early shrinkage.%在工程中为了防止高性能混凝土的裂缝产生,普遍采用掺加普通混凝土膨胀剂的方法,其效果不甚理想.高性能混凝土早期强度增长较快,其早期收缩也较大.而普通混凝土膨胀剂的膨胀速度较小,不能补偿高性能混凝土的早期收缩.试验研究了不同掺量和不同细度的膨胀剂对高性能混凝土的影响.试验证明较高细度的膨胀剂对高性能混凝土早期收缩有较好的补偿作用.
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