Improvement of the negative-temperature properties of calcium sulphoaluminate cement by three multifunctional chemical admixtures

IF 6.2 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Developments in the Built Environment Pub Date : 2024-09-08 DOI:10.1016/j.dibe.2024.100537

Hanlin Chen , Zhonghua Li , Guobing Ying

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引用次数: 0

Abstract

The construction of concrete in cold climates is associated with a significant energy consumption and an extensive carbon footprint. This is attributed to the production of raw materials and the necessity for additional measures to prevent frost damage. Finding suitable and environmental-friendly cementitious materials and admixtures for cold weather is a relatively straightforward and cost-effective solution. In this study, calcium sulphoaluminate cement (CSA) was selected, and low doses of three admixtures (lithium carbonate (Li₂CO₃), calcium mitrite (Ca(NO₂)₂), and calcium chloride (CaCl₂)) were used at low dosages to modify the properties of CSA at sub-zero temperatures. The results showed that: The addition of Li₂CO₃ to CSA can significantly increase the early hydration of CSA, improve the early mechanical properties, shorten the curing time, and significantly reduce the content of frozen water in the pores. Ca(NO₂)₂ ensured the sustained late-stage development of CSA strength, which reached 90.5 MPa at −7+28 d; CaCl₂ significantly lowered the freezing point of the cement paste and also improved the mid and late-stage strength.

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用三种多功能化学外加剂改善硫铝酸钙水泥的负温性能

在寒冷气候条件下建造混凝土需要消耗大量能源，并产生大量碳足迹。这主要归因于原材料的生产和采取额外措施防止冻害的必要性。为寒冷气候寻找合适且环保的胶凝材料和外加剂是一个相对直接且具有成本效益的解决方案。本研究选择了硫铝酸钙水泥（CSA），并使用低剂量的三种外加剂（碳酸锂（Li2CO3）、亚硝酸钙（Ca（NO2）2）和氯化钙（CaCl2））来改变 CSA 在零下温度下的性能。结果表明在 CSA 中添加 Li2CO3 可显著增加 CSA 的早期水化，改善早期力学性能，缩短固化时间，并显著降低孔隙中的冻水含量。Ca(NO2)2 保证了 CSA 后期强度的持续发展，在 -7+28 d 时达到 90.5 MPa；CaCl2 显著降低了水泥浆的凝固点，也提高了中后期强度。

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来源期刊

Developments in the Built Environment Multiple-

CiteScore

7.40

自引率

1.20%

发文量

审稿时长

22 days

期刊介绍： Developments in the Built Environment (DIBE) is a recently established peer-reviewed gold open access journal, ensuring that all accepted articles are permanently and freely accessible. Focused on civil engineering and the built environment, DIBE publishes original papers and short communications. Encompassing topics such as construction materials and building sustainability, the journal adopts a holistic approach with the aim of benefiting the community.