钢筋混凝土结构物发生裂缝,不仅影响外观,而且是降低混凝土结构物耐久性的一个重要原因。混凝土发生裂缝有多种原因,但干燥收缩不是混凝土发生裂缝的一个主要原因。为此,降低混凝土干燥收缩即成为提高混凝土结构物耐久性的一项有效手段。为抑制混凝土发生收缩裂缝,作为混凝土的掺合料,一般都采用通过水化反应生成膨胀性化合物,使混凝土发生膨胀的材料,还有就是目前正在使用的具有降低干燥收缩功能的减缩剂以及减缩型高性能AE减水剂等有机系外加剂。为提高混凝土结构物的耐久性,在混凝土的外加剂中,还开 Reinforced concrete structure cracks, not only affect the appearance, but also to reduce the durability of concrete structures is an important reason. Concrete cracks occur for a variety of reasons, but dry shrinkage is not a major cause of cracks in concrete. Therefore, reducing the dry shrinkage of concrete becomes an effective way to improve the durability of concrete structures. In order to restrain the occurrence of shrinkage cracks in concrete, as a concrete admixture, a material that expansively expresses compounds by hydration reaction to cause expansion of concrete is generally used, and a shrinkage reducing agent that has been used to reduce drying shrinkage, Type high-performance AE superplasticizer and other organic additives. In order to improve the durability of concrete structures, concrete admixtures, also open