膨胀剂对混凝土抗裂防渗的贡献

通过常规实验和基础实验，采用对比的方法，研究了膨胀剂的适宜掺量和对水泥砂浆强度的影响。结果表明，加入膨胀剂能补偿部分收缩，有效抑制或减少裂缝的产生，提高混凝土的耐久性；试验条件下试验所用膨胀剂的适宜掺量应小于6％：对补偿收缩混凝土，其限制膨胀率应作为第一性指标。

Contribution of expansion agent to crack resistance and penetration resistance of concrete

By routine test and base experience, with contrastive method, the appropriate mix content and the effect to concrete strength of a kind of expansion agent were studied. The result shows that, when expansion agent is added, shrinkage can be compensated at some extent and crack can be restrained or reduced effectively and then the concrete ageing resistance can be enhanced, and under experiment condition, the appropriate mix content of the expansion agent should be less than 6%, finally, for compensation shrinkage concrete, the restrictive expansion rete should be the primary index.