{"title":"Synergistic effects of SMA fibers and fly ash on the material characterization of recycled aggregate concrete","authors":"Nejib Ghazouani , Ali Raza , Ahmed Babeker Elhag","doi":"10.1016/j.matlet.2024.137670","DOIUrl":null,"url":null,"abstract":"<div><div>This study focuses on improving the material characterization of Recycled Aggregate Concrete (RAC) while minimizing its environmental impact. It explores the interaction between Shape Memory Alloy (SMA) fibers and fly ash (FA) in RAC. Comprehensive microstructural and mineralogical analyses were conducted using Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD), along with thermal assessments via Thermogravimetric Analysis (TGA) and Differential Thermogravimetry (DTG). SEM images consistently revealed hydration products, including calcium hydroxide and ettringite, across all specimens. The results indicate that incorporating SMA fibers significantly enhances FA-containing RAC by improving mechanical strength, thermal regulation, matrix densification, and crack control, effectively addressing the inherent weaknesses of recycled aggregates.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"379 ","pages":"Article 137670"},"PeriodicalIF":2.7000,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials Letters","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0167577X2401810X","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
This study focuses on improving the material characterization of Recycled Aggregate Concrete (RAC) while minimizing its environmental impact. It explores the interaction between Shape Memory Alloy (SMA) fibers and fly ash (FA) in RAC. Comprehensive microstructural and mineralogical analyses were conducted using Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD), along with thermal assessments via Thermogravimetric Analysis (TGA) and Differential Thermogravimetry (DTG). SEM images consistently revealed hydration products, including calcium hydroxide and ettringite, across all specimens. The results indicate that incorporating SMA fibers significantly enhances FA-containing RAC by improving mechanical strength, thermal regulation, matrix densification, and crack control, effectively addressing the inherent weaknesses of recycled aggregates.
本研究的重点是改进再生骨料混凝土（RAC）的材料特性，同时最大限度地减少其对环境的影响。它探讨了形状记忆合金（SMA）纤维和粉煤灰（FA）在 RAC 中的相互作用。使用扫描电子显微镜（SEM）和 X 射线衍射（XRD）进行了全面的微观结构和矿物学分析，并通过热重分析（TGA）和差热分析（DTG）进行了热评估。所有试样的 SEM 图像都一致显示出水化产物，包括氢氧化钙和乙长石。研究结果表明，加入 SMA 纤维后，含 FA 的 RAC 在机械强度、热调节、基体致密化和裂纹控制方面都有明显改善，从而有效解决了再生骨料的固有缺陷。
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
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