低Ca/Si比的C-S-H凝胶产物在抑制AAR中的作用

Effect of low Ca/Si ratio of C-S-H gels on restraining expansion due to alkali-aggregate reaction

碱是混凝土发生碱-集料(AAR)反应的重要因素之一。许多资料报道低Ca/Si比的C-S-H凝胶对碱有强烈的吸附作用。从C-S-H凝胶的组成出发,指出低Ca/Si比的C-S-H凝胶在抑制AAR中的作用,解释了低Ca/Si的C-S-H凝胶对碱的吸附能力强的原因及其影响因素。为在实际工程应用中掺加混合材来抑制AAR反应,提高混凝土耐久性有重大指导意义。

Alkali is one of the important factors that can cause alkali-aggregate reaction(AAR). Many papers have declared that low Ca/Si ratio of C-S-H gels has great absorptivity of alkali. Based on the composition of C-S-H gels, this paper points out that low Ca/Si ratio of C-S-H gels has effectiveness on restraining expansion due to AAR. It also explains why low Ca/Si ratio of C-S-H gels has great absorptivity of alkali and the affective factors. This can serve as instrnction on using admixture in cementitious materials on restraining expansion due to AAR and improving the durability of concrete.