Influence of magnesium oxychloride cement mortar with different strength grades: Fly ash as compensation material

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2024-11-29 DOI:10.1016/j.conbuildmat.2024.139354

Weixin Zheng , Jing Wen , Baolan Li , Jinmei Dong , Chenggong Chang , Yuanrui Li , Qiang Wang

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引用次数: 0

Abstract

Magnesium oxychloride cement (MOC) is widely used due to its high solid waste utilization efficiency. However, the demand for cement raw materials (MgO and MgCl₂) in the lower strength gradation remains low, leading to excessive sand particles in the slurry, thus reducing the working performance of the MOC mortar. Fly ash (FA) has been used in the construction industry to improve the workability of the slurry. The focus and innovation of this work involved using FA as a compensation material to produce MOC mortar materials with different strength levels. In this study, FA was used as compensation material to form MOC mortar with different strength grades, and the effects of FA on the MOC mortar flow performance, setting time, hydration heat release, strength development, phase composition, pore structure, and micromorphology were investigated. Combined with the experimental analysis and referring to the strength grade law of silicate concrete, the grade classification of MOC mortar with FA as the compensation material could be simply divided by adding 20 %, 30 %, 40 %, and 50 % FA, which could serve as a reference for the use design of MOC in different environments.

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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.