【摘要】 研究了一种性能优良的喷射混凝土用添加剂IVA,其pH值接近7在不同水泥中添加IVA进行的混凝土抗压强度测试及对比试验表明,IVA可显著提高水泥石早期抗压强度,不降低后期强度借助X射线衍射分析、扫描电镜微观分析等方法分析了添加剂增强作用机理,并进行了煤矿井下工业应用与试验验证.更多还原

【Abstract】 An alkali free inreasing viscosity flash setting admixture used in shotcrete is introduced in this paper. The agent possesses good properties and its pH value is about 7. The comparative experiments of the compressive strength among different kinds of cement pastes with adding IVA have been performed. It shows that IVA increases the early period compressive strength of hardened cement pastes, and it does not reduce the latter period strength. By means of X ray powdered crystal diffraction method and scanning electron microscope analysis, the rational explanation of IVAs strengthening mechanism to hardened cement pastes is obtained and presented. Applications of IVA in mine roadway and the in situ tests verified its good properties.更多还原