混凝土的干缩会引起结构抗剪能力的下降,从而导致破坏模式的改变,即从弯曲破坏变为脆性的剪切破坏。膨胀混凝土通过在其硬化过程中的膨胀有效地减少了干缩对混凝土的不良影响,克服了一般混凝土的这一缺陷。而低水灰比膨胀混凝土的再膨胀,不仅能提高裂缝构件的耐腐性,而且还能提高结构的抗剪能力和延性。 Shrinkage of concrete causes a decrease in the shear capacity of the structure, resulting in a change in the failure mode, ie, a shear failure that changes from a bending failure to a brittle failure. Expansive concrete effectively reduces the adverse effects of shrinkage on concrete through its expansion during its hardening process, and overcomes this defect of ordinary concrete. However, the re-expansion of low water-cement ratio concrete can not only improve the corrosion resistance of the cracked components, but also improve the shear resistance and ductility of the structure.