Hydration Mechanism of Portland and Calcium Sulphoaluminate Cementitious Material

IF 1.6 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Journal of Advanced Concrete Technology Pub Date : 2023-12-13 DOI:10.3151/jact.21.983
Jiahe Wang, Yanbin Tan, Huajian Li, Yongjiang Xie, Zhongwei Feng
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Abstract

This paper discusses the hydration process of Portland cement (PC) and Calcium Sulphoaluminate cement (CSA) composite material at the early age. The setting time and mortar strength were tested, the hydration process was analyzed by isothermal calorimetry tests, and the hydration products were characterized by XRD, SEM analysis. The results show that: CSA can significantly improve the hydration rate of ultra-early age (2 h and 6 h) and improve the mechanical properties. But there are still interactions between the hydration of PC and CSA, including that the gypsum in CSA will inhibit the hydration of C3A in PC and the CH generated by PC will promote the rehydration of AH3. The inhibiting or promoting effect of CSA on hydration process changes with its content. The design method of PC-CSA composite material was proposed, and the reasonable mixing amount of PC or CSA was also suggested.

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硅酸盐和硫铝酸钙水泥基材料的水化机理
本文讨论了硅酸盐水泥(PC)和硫铝酸钙水泥(CSA)复合材料在龄期的水化过程。测试了凝结时间和砂浆强度,通过等温量热试验分析了水化过程,并通过 XRD 和 SEM 分析对水化产物进行了表征。结果表明CSA 能明显提高超早期龄期(2 h 和 6 h)的水化速率,改善力学性能。但 PC 与 CSA 的水化仍存在相互作用,包括 CSA 中的石膏会抑制 PC 中 C3A 的水化,而 PC 产生的 CH 会促进 AH3 的再水化。CSA 对水化过程的抑制或促进作用随其含量的变化而变化。提出了 PC-CSA 复合材料的设计方法,以及 PC 或 CSA 的合理混合量。
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来源期刊
Journal of Advanced Concrete Technology
Journal of Advanced Concrete Technology 工程技术-材料科学:综合
CiteScore
3.70
自引率
10.00%
发文量
45
审稿时长
3.5 months
期刊介绍: JACT is fast. Only 5 to 7 months from submission to publishing thanks to electronic file exchange between you, the reviewers and the editors. JACT is high quality. Peer-reviewed by internationally renowned experts who return review comments to ensure the highest possible quality. JACT is transparent. The status of your manuscript from submission to publishing can be viewed on our website, greatly reducing the frustration of being kept in the dark, possibly for over a year in the case of some journals. JACT is cost-effective. Submission and subscription are free of charge . Full-text PDF files are available for the authors to open at their web sites. Scope: *Materials: -Material properties -Fresh concrete -Hardened concrete -High performance concrete -Development of new materials -Fiber reinforcement *Maintenance and Rehabilitation: -Durability and repair -Strengthening/Rehabilitation -LCC for concrete structures -Environmant conscious materials *Structures: -Design and construction of RC and PC Structures -Seismic design -Safety against environmental disasters -Failure mechanism and non-linear analysis/modeling -Composite and mixed structures *Other: -Monitoring -Aesthetics of concrete structures -Other concrete related topics
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