Synergistic effects of hybrid fibers and elevated temperature on strength and phase assemblage of granite Waste-Based geopolymer composites

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Letters Pub Date : 2025-08-15 Epub Date: 2025-04-15 DOI:10.1016/j.matlet.2025.138583

Ahmed Babeker Elhag , Nejib Ghazouani , Mohamed Hechmi El Ouni , Ali Raza

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Abstract

This study investigates the synergistic effects of hybrid fibers and elevated temperatures on the mechanical performance and phase behavior of granite waste-based geopolymer composites (GC). The influence of 1 % polyethylene fiber (PF) and 0.5 % Kevlar fiber (KF) on strength and thermal resistance was evaluated through compressive and flexural tests at ambient and elevated temperatures (250 °C, 500 °C, 1000 °C). Microstructural characterization was conducted using SEM, EDS, and XRD. Thermal curing at 100 °C for 12 h yielded optimal strength retention, with compressive strength increasing by up to 184.3 % at 500 °C. KF-reinforced composites exhibited superior thermal stability, retaining 180.38 % of their initial strength at 1000 °C. SEM and EDS analyses revealed structural modifications after heating, while XRD confirmed the transformation of crystalline phases into amorphous forms, contributing to enhanced strength. Si/Al ratios indicated the formation of silica-rich aluminosilicate gels, improving thermal stability.

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混杂纤维和高温对花岗岩废基地聚合物复合材料强度和相组合的协同效应

本文研究了混杂纤维和高温对花岗岩废基地聚合物复合材料力学性能和物相行为的协同效应。1%聚乙烯纤维（PF）和0.5%凯夫拉纤维（KF）对强度和耐热性的影响通过室温和高温（250°C, 500°C, 1000°C）的压缩和弯曲试验来评估。采用SEM、EDS、XRD等手段进行了微观结构表征。在100°C下热固化12 h，获得了最佳的强度保持，在500°C下抗压强度增加了184.3%。kf增强复合材料表现出优异的热稳定性，在1000℃时保持了初始强度的180.38%。SEM和EDS分析显示加热后的结构发生了变化，而XRD证实了晶相转变为非晶态，从而提高了强度。硅铝比表明形成了富硅铝硅酸盐凝胶，提高了热稳定性。

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来源期刊

Materials Letters 工程技术-材料科学：综合

CiteScore

5.60

自引率

3.30%

发文量

1948

审稿时长

50 days

期刊介绍： Materials Letters has an open access mirror journal Materials Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Materials Letters is dedicated to publishing novel, cutting edge reports of broad interest to the materials community. The journal provides a forum for materials scientists and engineers, physicists, and chemists to rapidly communicate on the most important topics in the field of materials. Contributions include, but are not limited to, a variety of topics such as: • Materials - Metals and alloys, amorphous solids, ceramics, composites, polymers, semiconductors • Applications - Structural, opto-electronic, magnetic, medical, MEMS, sensors, smart • Characterization - Analytical, microscopy, scanning probes, nanoscopic, optical, electrical, magnetic, acoustic, spectroscopic, diffraction • Novel Materials - Micro and nanostructures (nanowires, nanotubes, nanoparticles), nanocomposites, thin films, superlattices, quantum dots. • Processing - Crystal growth, thin film processing, sol-gel processing, mechanical processing, assembly, nanocrystalline processing. • Properties - Mechanical, magnetic, optical, electrical, ferroelectric, thermal, interfacial, transport, thermodynamic • Synthesis - Quenching, solid state, solidification, solution synthesis, vapor deposition, high pressure, explosive