Enhancing temperature resistance of calcium aluminate cement through carbonated steel slag

IF 6.7 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of building engineering Pub Date : 2025-02-03 DOI:10.1016/j.jobe.2025.111956

Zhaohou Chen , Jiangshui Cui , Yang Liu , Xiaohuan Jing , Bingyang He , Daqiang Cang , Lingling Zhang

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引用次数: 0

Abstract

The conversion from metastable phase to stable phase in calcium aluminate cement (CAC) caused by temperature increase can lead to an increase in porosity and a decrease in compressive strength. This study investigated the effects of carbonated steel slag (CSS) on the hydration, microstructure, and resistance to temperature fluctuations of CAC at temperatures ranging from 20 °C to 70 °C. The results showed that the incorporation of CSS leads to the formation of carbonate-AFm (or AFt) phases (hemicarboaluminate (Hc) and monocarboaluminate (Mc)). The increase of CSS content promotes the hydration of CA and CA₂ to Hc and Mc (Hc/Mc), and weakens the hydration to C₃AH₆ and AH₃ at 70 °C. Therefore, the impact of the conversion from CAH₁₀ phase to C₃AH₆ phase on CAC is weakened. As the CSS content increases from 0 to 40 %, the loss of compressive strength of the samples decreases from 45.7 % to 10.4 % at 70 °C for 7 days, corresponding to a 77.2 % increase in temperature fluctuation resistance. Meanwhile, the addition of CSS can alleviate the increase in pore volume of CAC at 70 °C, and even lead to a decrease in CSS-40 sample.

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来源期刊

Journal of building engineering Engineering-Civil and Structural Engineering

CiteScore

10.00

自引率

12.50%

发文量

1901

审稿时长

35 days

期刊介绍： The Journal of Building Engineering is an interdisciplinary journal that covers all aspects of science and technology concerned with the whole life cycle of the built environment; from the design phase through to construction, operation, performance, maintenance and its deterioration.