It was found originally that environment atmosphere could effect the entrained air content of concrete.
首次发现环境气压能够影响混凝土的含气量。
The air entraining concrete's shrinkage and creep were less than concrete which not content air entrained agent, and the durability performance was improved obviously.
混凝土的收缩和徐变较不引气混凝土相比较小；耐久性能明显改善。
The air entraining concrete's shrinkage and creep were less than concrete which not content air entrained agent, and the durability performance was improved obviously.
混凝土的收缩和徐变较不引气混凝土相比较小；耐久性能明显改善。
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