Rheological and mechanical properties of 3D printable magnesium oxysulfate cements

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

Construction and Building Materials Pub Date : 2025-02-28 DOI:10.1016/j.conbuildmat.2025.140618

Qiyan Li , Xiaodong Wen , Xiaojian Gao

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引用次数: 0

Abstract

Magnesium oxysulfate cement (MOS) offers a promising alternative to 3D-printed Portland cement due to its rapid hardening and high strength. The layer-to-layer interfacial bonding of the 3D printed specimen is closely related to the rheological performance of fresh mixtures. This paper investigates the influence of rheological properties on the printability and mechanical performance of 3D printable magnesium oxysulfate cement (3DP-MOS) paste. The results show that an increase in the magnesium-to-sulfur ratio reduces fluidity and lowers the minimum water content of MOS mortar, enhancing packing density, accelerating early hydration, and improving printability, extrusion stability and structural integrity. MOS mortar with a molar ratio (MgO: MgSO₄·7H₂O: H₂O) of 15:1:12 or 21:1:15 demonstrates optimal flow performance and setting time. Dynamic yield stress values ranging from 587.9 to 888.7 Pa and a consistency factor of 2.0–36.8 in 3DP-MOS mortar ensure stable extrusion width and stacking height, closely aligning with the intended design and ensuring both precision and structural integrity in 3D-printed structures. Additionally, higher dynamic yield stress and a lower consistency factor promote uniform deposition and a denser microstructure in 3D-printed MOS materials, enhancing mechanical properties.

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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.