稻壳灰具有优良的微集料填充效应和火山灰活性,按一定比例掺量加入到混凝土中能够有效改善混凝土的多项性能.本文采用不同比例稻壳灰等量部分替代水泥制备稻壳灰混凝土,并对其耐久性(抗渗性能、耐磨性性能)和微观性能(扫描电镜(SEM)分析、EDS分析和纳米压痕)进行了细致的测试和研究.试验结果表明,稻壳灰的加入能够显著改善混凝土的耐久性和微观性能,随着稻壳灰掺量不断增加,稻壳灰混凝土的抗渗性能也不断增强,当稻壳灰掺量为20％时,其耐久性能达到最佳状态;SEM、EDS分析表明稻壳灰混凝土的微观结构中无明显孔隙存在,且有大量水化硅酸钙凝胶生成;纳米压痕结果表明稻壳灰加入有效提高了水泥的水化速率,增加了高密度水化硅酸钙凝胶的数量,增加了混凝土结构紧密性和完整性.
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