Effect of crumb rubber and polyethylene fiber on the strength and toughness of fly ash/slag-based geopolymer concrete

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

Construction and Building Materials Pub Date : 2024-11-14 DOI:10.1016/j.conbuildmat.2024.139133

Ibrahim Wahab Adebayo , Guangcheng Long , Zhuo Tang , Mohammad Osman Ghone , Saifurahman Zaland , Mustapha Jamaa Garba , Kai Yang , Khalid Akhunzada , Usman Abdulfatai Oluwasina

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引用次数: 0

Abstract

Although geopolymer concrete has been regarded as an eco-friendly alternative to traditional concrete, it exhibits the same features of high brittleness or low ductility as traditional concrete. To address these challenges and promote sustainability, this study investigated the effects of crumb rubber (CR) and polyethylene (PE) fiber on the physical properties, strength, and toughness of fly ash/slag-based geopolymer concrete, in which CR produced from recycled rubber was replaced by natural sand at volume fractions of 5 %, 10 %, and 15 %, while PEF was added at volume fractions of 0.25 %, 0.5 %, and 0.75 %. The test results show that while the mechanical strength of CR specimens was low, their toughness and failure characteristics improved. PEF greatly enhanced the mechanical strength and toughness, which enhanced the failure mode. Notably, the synergistic impact of mixing CR and PEF produced better results than using these toughening materials separately, hybrid mix of 5 % CR and 0.75 % PEF were found to provide optimum toughness and moderate strength. These results were validated by microstructural analysis, highlighting the enhanced bonding with PEF and the negative impact of excessive CR on the concrete matrix.

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碎屑橡胶和聚乙烯纤维对粉煤灰/矿渣土工聚合物混凝土强度和韧性的影响

尽管土工聚合物混凝土被认为是传统混凝土的环保型替代品，但它与传统混凝土一样具有高脆性或低延展性的特点。为了应对这些挑战并促进可持续发展，本研究调查了碎屑橡胶（CR）和聚乙烯（PE）纤维对粉煤灰/矿渣基土工聚合物混凝土的物理性能、强度和韧性的影响，其中用天然砂替代回收橡胶生产的 CR，体积分数分别为 5%、10% 和 15%，而聚乙烯纤维的体积分数分别为 0.25%、0.5% 和 0.75%。试验结果表明，虽然 CR 试样的机械强度较低，但其韧性和破坏特性得到了改善。PEF 大大提高了机械强度和韧性，从而改善了破坏模式。值得注意的是，与单独使用这两种增韧材料相比，混合 CR 和 PEF 的协同效应产生了更好的结果，5% CR 和 0.75% PEF 的混合体可提供最佳的韧性和适中的强度。这些结果得到了微观结构分析的验证，凸显出 PEF 增强了粘结力，而过量的 CR 则对混凝土基体产生了负面影响。

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.