Accelerating strength development of cementitious mixtures using aluminum sulfate liquid accelerator with aluminium formate

IF 1.8 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Magazine of Concrete Research Pub Date : 2024-01-23 DOI:10.1680/jmacr.23.00170

Wan Zhang, Zhihong Wu, Wang Huang, Jiawei Wang, Yuexin Pan, Zhishun Li, Shufang Ren, Hongjin Xu

引用次数: 0

Abstract

The alkali-free liquid accelerator (ALSF) was prepared with aluminum sulfate and aluminum formate as the main components. The effects of ALSF on the setting of paste and the mechanical strength of mortar were studied, and the impact of ALSF on the early hydration behavior and hydration products of paste were investigated by isothermal calorimeter analysis, X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetric (TG) analysis. The results show that ALSF is excellent for the rapid setting and hardening of the cement. When the content of ALSF was 8 wt%, the initial setting time and final setting time of paste were 85 s and 180 s, respectively, and the 1 d and 28 d strengths of mortar were 9.52 MPa and 44.42 MPa, respectively. ALSF can accelerate the dissolution and hydration of C3A and C3S and promote the formation of 3CaO·Al2O3·3CaSO4·32H2O (ettringite), AFt formate, and portlandite.

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使用含有甲酸铝的硫酸铝液体促进剂加速水泥基混合物的强度发展

以硫酸铝和甲酸铝为主要成分制备了无碱液体促进剂（ALSF）。研究了 ALSF 对水泥浆凝结和砂浆机械强度的影响，并通过等温量热仪分析、X 射线衍射（XRD）、扫描电子显微镜（SEM）和热重（TG）分析研究了 ALSF 对水泥浆早期水化行为和水化产物的影响。结果表明，ALSF 对水泥的快速凝结和硬化有很好的作用。当 ALSF 含量为 8 wt% 时，浆体的初凝时间和终凝时间分别为 85 s 和 180 s，砂浆的 1 d 强度和 28 d 强度分别为 9.52 MPa 和 44.42 MPa。ALSF 可加速 C3A 和 C3S 的溶解和水化，促进 3CaO-Al2O3-3CaSO4-32H2O （乙特林岩）、甲酸 AFt 和硅酸盐的形成。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Magazine of Concrete Research 工程技术-材料科学：综合

CiteScore

4.60

自引率

11.10%

发文量

102

审稿时长

5 months

期刊介绍： For concrete and other cementitious derivatives to be developed further, we need to understand the use of alternative hydraulically active materials used in combination with plain Portland Cement, sustainability and durability issues. Both fundamental and best practice issues need to be addressed. Magazine of Concrete Research covers every aspect of concrete manufacture and behaviour from performance and evaluation of constituent materials to mix design, testing, durability, structural analysis and composite construction.