窑灰作为混凝土掺和料的水化特性

Hydration Characteristics of Cement Kiln Dust as Cementitions Materials

以粉煤灰、矿渣和窑灰与普通硅酸盐水泥组成的复合体为试验对象,采用无电极电阻率测试仪、水化热测定法和扫描电镜(SEM)等研究了不同体系的水化特性,并测定了砂浆的抗折和抗压强度.研究结果表明,窑灰中的可溶性碱和硫酸盐成份,能为激发粉煤灰和矿渣的潜在活性提供必要的碱性环境,提高了大掺量混合材体系的早期强度.

In this paper, cement kiln dust （CKD）, fly ash and slag were mixed with Portland cement to compose a complex system. The hydration characteristics of the system were then investigated using a non-contacting resistivity meter and by means of hydration heat test and SEM. Moreover, the folding resistance and compressive resistance of the mortar were measured. The results show that the water-soluble alkali and sulfate compounds in CKD provide an alkali environment for the activation of the latent activity of fly ash and slag, and help to improve the early-stage strength of the blending system with large doping amount.