Performance improvement of magnesium oxychloride cement through in situ polymerization regulated by crosslinker structure

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

Construction and Building Materials Pub Date : 2025-02-19 DOI:10.1016/j.conbuildmat.2025.140465

Wenguang Zhou, Mingyang Bai, Xingong Li, Yiqiang Wu, Tao Liu

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引用次数: 0

Abstract

The development of contemporary magnesium oxychloride cement (MOC) is often limited by the challenge of balancing water resistance with mechanical properties. This study investigates an approach to mitigate this trade-off through the in situ polymerization of acrylamide (AM) and acrylic acid (AA) monomer within MOC composites, facilitated by the crosslinkers N, N′-methylenebisacrylamide (MBA) or Poly(ethylene glycol) diacrylate (EDA). In this system, a polymer layer is formed, creating a highly entangled network that strengthens interfacial bonding between hydration products and polymers, reduces porosity, refines the pore size distribution, and enhances the compactness of the MOC matrix. The findings indicate that in situ polymerization MOC with 0.2 % MBA significantly outperformed pure MOC, exhibiting increased 28-d compressive strength (68.84 MPa vs. 61.40 MPa) and softening coefficient (0.83 vs. 0.18). Moreover, the prolonged setting time of MOC enhanced its workability during construction. This study provides a viable strategy for the development of high-performance MOC-based cements and highlights the importance of in situ polymerization in the fabrication of advanced cement composites.

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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.