Effect of aluminum sulfate on the hydration of Portland cement, tricalcium silicate and tricalcium aluminate
Effect of aluminum sulfate on the hydration of Portland cement, tricalcium silicate and tricalcium aluminate
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硫酸铝对硅酸盐水泥、硅酸三钙、铝酸三钙水化的影响
DOI：
10.1016/j.conbuildmat.2019.117179
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发表时间：
2020-01-30
影响因子：
7.4
通讯作者：
Mei, Junpeng
中科院分区：
文献类型：
--
作者：
Liu, Xiaohai;Ma, Baoguo;Mei, Junpeng
无碱速凝剂主要成分为硫酸铝（AS），是喷射混凝土中广泛使用的化学外加剂。因此，AS对水泥水化的影响有待进一步研究。本研究重点关注 AS 对 C3S 和 C(3)A 水合反应的影响，并通过水合热、XRD、TGA 和热力学模型等各种测量结果进行说明。结果表明，AS在诱导期通过快速生成AFt来加速C3S水化，并在短暂阻碍后通过产生SO4-AFm和OH-AFm来促进C(3)A水化。这些便利措施被纳入促进水泥水化的过程中。研究结果可为加速器的开发提供指导。 (C) 2019 Elsevier Ltd. 保留所有权利。
Alkali-free accelerator, mainly composed of aluminum sulfate (AS), is a widely used chemical admixture in the sprayed concrete. Thus, the impact of AS on the cement hydration should be further studied. This research focused on the effect of AS on the hydration reaction of C3S and C(3)A, illustrated by various measurements, including hydration heat, XRD, TGA, and thermodynamic modeling. Results indicated that AS accelerated the C3S hydration by rapidly generating AFt in induction period, and facilitated the C(3)A hydration by producing SO4-AFm and OH-AFm after a short hinderance. These facilitations were integrated into the promotion on cement hydration. The findings could provide guidance for the development of accelerator. (C) 2019 Elsevier Ltd. All rights reserved.