Influence of molar ratio on properties of MgO-hydromagnesite binder

IF 8.9 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2026-04-11 Epub Date: 2026-03-10 DOI:10.1016/j.conbuildmat.2026.145863

Zhen Li , Lulu Zhang , Zhongcheng Li , Yongbo Huang , Hao Tang , Jueshi Qian

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Abstract

The performance and quality of MgO-based cement largely depend on the molar ratio of its constituent reactants. The MgO-hydromagnesite (MgO-HY) system is a new type of low-carbon MgO-based cementitious material, but the influence of the key component ratio of MgO/hydromagnesite on its performance has not yet been studied. To clarify the performance characteristics of the MgO-HY system and optimize its composition ratio, this study investigates the MgO/hydromagnesite molar ratio (e.g. 8/1,16/1, 32/1, 64/1, 96/1 and 128/1) on properties of MgO-HY paste and mortar. The fluidity, setting time, compressive strength, dimensional stability, bulk density and permeable porosity of MgO-HY binder are tested. Mortar specimens with varying water-binder ratios are prepared and tested to evaluate their mechanical performance. The phase formation and micromorphology are analyzed to correlate microstructural development with macroscopic properties. Results demonstrate that higher MgO/hydromagnesite ratio promote the generation of hydrous carbonate containing brucite (HCB), which accelerates setting, improves strength and reduces drying shrinkage. However, beyond a molar ratio of 96/1, the effectiveness of HCB in filling pore space diminishes due to reduced crystal size, leading to decreased strength and slightly increased shrinkage. Optimal performance, characterized by high strength and minimal shrinkage, is observed within the molar ratio range of 32/1–96/1. Additionally, lowering the water-binder ratio significantly enhances mortar strength, achieving a maximum value of 51.8 MPa.

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摩尔比对氧化镁-氢菱镁矿粘结剂性能的影响

mgo基水泥的性能和质量在很大程度上取决于其组成反应物的摩尔比。MgO-氢菱镁矿（MgO- hy）体系是一种新型的低碳MgO基胶凝材料，但MgO/氢菱镁矿关键组分配比对其性能的影响尚未研究。为了明确MgO- hy体系的性能特点并优化其组成比例，本研究考察了MgO/氢菱镁矿摩尔比（如8/1,16/ 1,32 / 1,64 / 1,96 /1和128/1）对MgO- hy膏体和砂浆性能的影响。测试了MgO-HY粘结剂的流动性、凝结时间、抗压强度、尺寸稳定性、体积密度和渗透孔隙率。制备了不同水胶比的砂浆试件，并对其力学性能进行了测试。分析了相形成和微观形貌，将微观结构的发展与宏观性能联系起来。结果表明：较高的氧化镁/氢菱镁矿比促进含水镁石碳酸盐（HCB）的生成，加速了凝固，提高了强度，减少了干燥收缩率；然而，当摩尔比超过96/1时，由于晶体尺寸减小，HCB填充孔隙空间的有效性减弱，导致强度下降，收缩率略有增加。在32/1 ~ 96/1的摩尔比范围内，具有高强度和最小收缩率的最佳性能。降低水胶比显著提高砂浆强度，砂浆强度最大值为51.8 MPa。

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.