未分类题

下列混凝土外加剂中，不能提高混凝土抗渗性的是哪一种? A.膨胀剂 B.减水剂 C.缓凝剂 D.引气剂

A.膨胀剂
B.减水剂
C.缓凝剂
D.引气剂

【参考答案】

C
提示：缓凝剂只改变凝结时间，通常对混凝土的抗渗性没有影响。
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