Enhancing printability and mechanical performance of 3D printed magnesium phosphate cement through silica fume modification: Rheological, microstructural, and numerical insights

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

Construction and Building Materials Pub Date : 2025-04-19 DOI:10.1016/j.conbuildmat.2025.141302

Chaofan Wang , Bin Li , Bing Chen

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引用次数: 0

Abstract

This study explores the modification of 3D printed magnesium phosphate cement (MPC) using silica fume (SF) from rheological, microstructural and numerical perspectives, with the aim of enhancing its printability and mechanical performance. Results demonstrate that the incorporation of SF improved the yield stress and viscosity by forming compact flocculation structures. For hardened 3D printed MPC, SF reduced its mechanical anisotropy by enhancing its interlayer bonding. Microstructural analysis reveals that SF refined pores, suppressed dittmarite formation and promoted the formation of magnesium silicate hydrated (M-S-H) phase at interlayers, which is critical for the interlayer bonding enhancement. A discrete element method (DEM) model validates the critical influence of interlayer bonding on anisotropic behavior and reveals the failure mechanism of 3D printed MPC loaded in different loading directions. This work bridges the gap between rheology control and mechanical anisotropy in 3D printed MPC, offering valuable insights for advancing additive manufacturing in construction.

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通过硅灰改性提高 3D 打印磷酸镁水泥的可打印性和机械性能：流变学、微观结构和数值见解

本研究从流变学、微观结构和数值角度探讨了使用硅灰（SF）对 3D 打印磷酸镁水泥（MPC）进行改性的问题，旨在提高其可打印性和机械性能。结果表明，硅灰的加入通过形成紧凑的絮凝结构提高了屈服应力和粘度。对于硬化的三维打印 MPC，SF 通过增强层间粘合力降低了其机械各向异性。微观结构分析表明，SF 可细化孔隙，抑制闪长岩的形成，促进层间水合硅酸镁（M-S-H）相的形成，这对增强层间结合力至关重要。离散元素法（DEM）模型验证了层间结合对各向异性行为的关键影响，并揭示了以不同加载方向加载的三维打印 MPC 的失效机理。这项研究填补了三维打印 MPC 中流变控制与机械各向异性之间的空白，为推进建筑增材制造提供了宝贵的见解。

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.