高含量磷石膏胶凝材料的新设计理念：从填料模型到微观结构优化

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

Construction and Building Materials Pub Date : 2025-06-12 DOI:10.1016/j.conbuildmat.2025.142165

Zhengkang Yu , Zhijie Liu , Chiqiu Wu , Wei Lv , Jing He , Yisheng Li , Zhonghe Shui

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引用次数: 0

摘要

磷石膏由于其大规模生产和有限的应用，在资源利用方面面临着重大挑战。本研究旨在开发含有超过70 % PG的高含量磷石膏胶凝材料（HPCM），以及少量补充胶凝材料（SCMs）和水泥。提出了一种考虑固体颗粒尺寸和形貌特征的新型填料模型。采用Box-Behnken设计（BBD）评价了关键模型参数对HPCM填料密度（PD）的影响。在此基础上，利用偏高岭土（MK）对PG、SCMs和水泥的填料结构进行优化，确定了HPCM的最佳配合比。研究了SCMs组成和压实压力对HPCM物理性能、机械强度、水化产物和微观结构的影响。SCMs的颗粒级配对HPCM的PD有显著影响。当MK含量为5 %，压实压力为60 MPa时，HPCM的28d抗压强度最大，达到68.8 MPa。这种最佳的MK含量优化了孔隙结构，减少了PG再结晶，减少了裂纹的形成。当MK含量超过5 %时，水化产物的形成减少，且压实压力越高，水化产物的形成减少越明显。过高的压力降低了PG的再结晶，但限制了水化产物的发展，导致基体膨胀。该研究为优化HPCM的配合比设计提供了一种新的途径，有利于资源的可持续利用和环境的保护。

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A new design concept for high-content phosphogypsum cementitious materials: From packing model to microstructural optimization

Phosphogypsum (PG) faces significant challenges in resource utilization due to its large-scale production and limited applications. This study aims to develop high-content phosphogypsum cementitious materials (HPCM) containing over 70 % PG, along with small amounts of supplementary cementitious materials (SCMs) and cement. A novel packing model is proposed, incorporating the particle size and morphology characteristics of solid particles in HPCM. The Box-Behnken design (BBD) is employed to evaluate the effects of key model parameters on the packing density (PD) of HPCM. On this basis, metakaolin (MK) is used to optimize the packing structure of PG, SCMs, and cement, and the optimal mix proportion for HPCM is determined. The study investigates the effects of SCMs composition and compacting pressure on HPCM’s physical properties, mechanical strength, hydration products and microstructure. The particle gradation of SCMs significantly influences the PD of HPCM. The 28d compressive strength of HPCM reaches a maximum of 68.8 MPa when the MK content is 5 % and the compacting pressure is 60 MPa. This optimal MK content optimizes the pore structure and minimizes PG recrystallization, reducing crack formation. When the MK content exceeds 5 %, the formation of hydration products decreases, and this reduction becomes more significant under higher compacting pressure. Excessive pressure reduces PG recrystallization but limits hydration product development, causing matrix expansion. The study offers a novel approach for optimizing the mix design of HPCM, contributing to sustainable resource utilization and environmental protection.

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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.