Improving the strength of cement mortar by adding ether organics to aluminum sulfate liquid accelerator

IF 3.4 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Materials and Structures Pub Date : 2024-05-18 DOI:10.1617/s11527-024-02383-1

Wan Zhang, Zhihong Wu, Wang Huang, Jiayuan Liu, Huafeng Zhou, Junlong Qiu

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Abstract

It is insufficient to enhance the strength of shotcrete by simply relying on the early strength component aluminum sulfate in the liquid accelerator. The introduction of organic additives can effectively compensate for this deficiency. In this study, three different structures of organic ethers, 18-crown-6 (ECS), tetraethylene glycol monomethyl ether (Tg), and ethylene glycol monomethyl ether (Eg), were added to an aluminum sulfate alkali-free liquid accelerator, and their effects were comprehensively investigated. The results revealed that these organic ethers were capable of bolstering the strength of the mortar after 28 d. The efficiency of these ether organics on the strength of cement mixed with the accelerator followed the order: ECS > Tg > Eg. Specifically, when the ECS content reached 0.3%, the compressive strength of the mortar at 1 d was measured at 8.07 MPa. In addition, changes in the phase composition and micromorphology were scrutinized through X-ray diffraction and scanning electron microscopy, culminating in the establishment of a mechanistic model elucidating the hydration process of organic ether accelerator cement.

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在硫酸铝液体促进剂中添加醚类有机物以提高水泥砂浆的强度

仅仅依靠液体促进剂中的早强成分硫酸铝来提高喷射混凝土的强度是不够的。引入有机添加剂可以有效弥补这一不足。本研究在无碱硫酸铝液体促进剂中添加了三种不同结构的有机醚，即 18-冠醚（ECS）、四甘醇单甲醚（Tg）和乙二醇单甲醚（Eg），并对其效果进行了全面研究。结果表明，这些有机醚在 28 d 后能够增强砂浆的强度：具体来说，当 ECS 含量达到 0.3% 时，1 d 后砂浆的抗压强度为 8.07 MPa。此外，还通过 X 射线衍射和扫描电子显微镜研究了相组成和微观形态的变化，最终建立了一个阐明有机醚促进剂水泥水化过程的机理模型。

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来源期刊

Materials and Structures 工程技术-材料科学：综合

CiteScore

6.40

自引率

7.90%

发文量

222

审稿时长

5.9 months

期刊介绍： Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.