Synthesis of geopolymer composites utilizing PVA-modified basalt fibers and foundry waste: Fundamental properties, cracking resistance and fracture toughness

IF 10.8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement & concrete composites Pub Date : 2025-03-15 DOI:10.1016/j.cemconcomp.2025.106046

Yuwei Zhang, Chengliang Zhou, Yafeng Gong, Fei Wu, Yuheng Liu, Jiaxiang Song, Fuyu Wang

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引用次数: 0

Abstract

Coal gangue/slag-based geopolymer composites (CSGC) have garnered significant attention in sustainable construction due to their low-carbon footprint, but their high brittleness remains a critical limitation. This study addresses this challenge by modifying basalt fiber (BF) with polyvinyl alcohol (PVA) to enhance CSGC. A novel porosity detection program, with an average accuracy exceeding 98 % for pores larger than 10 pixels (0.4 mm), was developed to analyze pore evolution. Combined with a multi-scale testing approach, the study evaluates shrinkage, fracture toughness, compressive strength, and flexural strength of fiber-reinforced CSGC. Results revealed that PVA coating enhanced fiber-CSGC matrix bonding via chemical crosslinking, such as O-Al-O bonds, and mechanical interlocking, achieving 15.9 % and 19.1 % improvements in the 28-d flexural and compressive strength of modified basalt fibers (MBF)-reinforced CSGC, respectively. Acoustic emission (AE) analysis indicated that fibers shifted the dominant cracking mode from shear to a mixed tensile-shear mode (20.99 % tensile cracks), thereby enhancing CSGC toughness. Moreover, double-K fracture model analysis, based on digital image correlation (DIC) test results, confirmed that MBF outperforms unmodified fibers in toughening effects, with increases of 50.0 % and 32.4 % in initiation and unstable fracture toughness, respectively. This study presents an effective strategy for reducing brittleness in geopolymers through interface-engineered fiber reinforcement, which is expected to promote the development of high-performance, sustainable construction materials.

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利用聚乙烯醇改性玄武岩纤维和铸造废料合成地聚合物复合材料：基本性能、抗裂性和断裂韧性

煤矸石/矿渣基地聚合物复合材料（CSGC）由于其低碳足迹在可持续建筑中引起了广泛关注，但其高脆性仍然是一个关键限制。本研究通过用聚乙烯醇（PVA）改性玄武岩纤维（BF）来增强CSGC来解决这一挑战。开发了一种新的孔隙度检测程序，对于大于10像素（0.4 mm）的孔隙，平均精度超过98%，用于分析孔隙演化。结合多尺度试验方法，研究评估了纤维增强CSGC的收缩率、断裂韧性、抗压强度和抗弯强度。结果表明，PVA涂层通过O-Al-O键和机械互锁等化学交联方式增强了纤维与CSGC基体的结合，改性玄武岩纤维（MBF）增强CSGC的28 d抗折强度和抗压强度分别提高了15.9%和19.1%。声发射（AE）分析表明，纤维将主要的剪切开裂模式转变为拉伸-剪切混合模式（占拉伸裂纹的20.99%），从而提高了CSGC的韧性。此外，基于数字图像相关（DIC）测试结果的双k断裂模型分析证实，MBF的增韧效果优于未改性纤维，其起裂韧性和不稳定断裂韧性分别提高了50.0%和32.4%。本研究提出了一种通过界面工程纤维增强来降低地聚合物脆性的有效策略，有望促进高性能、可持续建筑材料的发展。

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来源期刊

Cement & concrete composites 工程技术-材料科学：复合

CiteScore

18.70

自引率

11.40%

发文量

459

审稿时长

65 days

期刊介绍： Cement & concrete composites focuses on advancements in cement-concrete composite technology and the production, use, and performance of cement-based construction materials. It covers a wide range of materials, including fiber-reinforced composites, polymer composites, ferrocement, and those incorporating special aggregates or waste materials. Major themes include microstructure, material properties, testing, durability, mechanics, modeling, design, fabrication, and practical applications. The journal welcomes papers on structural behavior, field studies, repair and maintenance, serviceability, and sustainability. It aims to enhance understanding, provide a platform for unconventional materials, promote low-cost energy-saving materials, and bridge the gap between materials science, engineering, and construction. Special issues on emerging topics are also published to encourage collaboration between materials scientists, engineers, designers, and fabricators.