Unravelling the role of lithium ions in reaction kinetics and properties of magnesium oxychloride cement

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-10-07 DOI:10.1016/j.conbuildmat.2025.143881

Tingjie Huang , Jionghuang He , Kai Zhang , Kaigui Kang , Qiang Yuan

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引用次数: 0

Abstract

Although lithium salts are recognized as important accelerators in modern cementitious systems, their specific effects and underlying mechanisms in magnesium oxychloride cement (MOC) remain unclear. This study investigates the influence of LiCl on the phase evolution, interparticle interactions, and microstructure of MOC, with the aim of elucidating the mechanisms by which LiCl regulates the fresh and hardened properties of MOC. The results demonstrate that LiCl profoundly alters MOC hydration by accelerating MgO dissolution and modulating the crystallization dynamics of Phase 5. While LiCl addition exerts minimal impact on flow behaviors, it significantly enhances the development of elasticity by suppressing interparticle repulsion and rapidly forming a cohesive hydrates network, thereby shortening setting times. The enhanced hydration kinetics promote the early-age compressive and flexural strengths. Moreover, LiCl facilitates the growth of densely interlocking needle-like Phase 5 crystals, generating a low-porosity matrix that further enhances both the mechanical properties and short-term water resistance of MOC. However, prolonged water exposure still induces considerable strength degradation of LiCl-modified MOC due to phase instability.

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锂离子在氯氧镁水泥反应动力学和性能中的作用

虽然锂盐在现代胶凝体系中被认为是重要的促进剂，但其在氯化镁氧水泥（MOC）中的具体作用和潜在机制尚不清楚。本研究探讨了LiCl对MOC的相演化、粒子间相互作用和微观结构的影响，旨在阐明LiCl调控MOC新鲜和硬化性能的机制。结果表明，LiCl通过加速MgO的溶解和调节第5相的结晶动力学，深刻地改变了MOC的水化。虽然LiCl的加入对流动行为的影响很小，但它通过抑制颗粒间的排斥作用，迅速形成一个有凝聚力的水合物网络，从而显著增强了弹性的发展，从而缩短了凝结时间。水化动力学的增强提高了早期抗压和抗折强度。此外，LiCl促进了紧密联锁的针状5相晶体的生长，产生了低孔隙率的基体，进一步提高了MOC的力学性能和短期耐水性。然而，由于相不稳定，长时间的水暴露仍然会导致licl改性MOC的强度下降。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.