The Influences and Effect Mechanism of Low Temperature Curing on the Performances of Basic Magnesium Sulfate Cement

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.21.995
Keyue Fang, Chengyou Wu, Hongdu Chen
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Abstract

Due to lightweight, high-strength, and high toughness properties, Basic magnesium sulfate cement (BMSC) can be widely used in producing various structural and decorative products. Most current research only focuses on the performance of BMSC under room temperature. However, low temperature environments may have a serious impact on the performance of BMSC, such as during cold seasons or in salt lake cold regions with abundant magnesium resources, so the performance of BMSC in low temperature environment needs to be explored to expand its application. This study investigated the influence of different low temperatures (−5 to 20°C) on the compressive strength and water resistance of BMSC cement. The phase composition, microstructure and pore structure of BMSC has been analyzed using XRD, QXRD, TG/DTA, SEM, BSEM/EDS Mapping and MIP. The Results indicate that the low hydration rate, precipitation of magnesium sulfate, increase in porosity and decrease in 517 phase content are the main reasons for the low strength of BMSC under low temperature curing. Although hardened BMSCs cured at low temperatures can continue to hydrate in water to form strength phases, corrosion and cracking may occur. Replacing light burned magnesite with high active magnesium oxide can significantly improve the mechanical properties of low temperature cured BMSC. However, low temperatures reduced the crystallinity of the 517 phase, thereby increasing its water solubility and lead to poor water resistance of BMSC.

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低温固化对碱式硫酸镁水泥性能的影响及作用机制
碱式硫酸镁水泥(BMSC)具有轻质、高强度和高韧性等特性,可广泛用于生产各种结构和装饰产品。目前大多数研究只关注 BMSC 在室温下的性能。然而,低温环境可能会对硫酸镁水泥的性能产生严重影响,例如在寒冷季节或镁资源丰富的盐湖寒冷地区,因此需要探索硫酸镁水泥在低温环境下的性能,以扩大其应用范围。本研究探讨了不同低温(-5 至 20°C)对 BMSC 水泥抗压强度和耐水性的影响。使用 XRD、QXRD、TG/DTA、SEM、BSEM/EDS 制图和 MIP 分析了 BMSC 的相组成、微观结构和孔隙结构。结果表明,水化率低、硫酸镁析出、孔隙率增加和 517 相含量减少是低温固化下 BMSC 强度低的主要原因。虽然低温固化的硬化 BMSC 可继续在水中水化形成强度相,但可能会发生腐蚀和开裂。用高活性氧化镁替代轻烧菱镁矿可显著改善低温固化 BMSC 的机械性能。然而,低温会降低 517 相的结晶度,从而增加其水溶性,导致 BMSC 的耐水性变差。
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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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