Durability behaviour of self-compacting concrete containing high-volume fly ash and alternative aggregates

IF 1.5 4区 工程技术 Q3 ENGINEERING, CIVIL Proceedings of the Institution of Civil Engineers-Engineering Sustainability Pub Date : 2022-10-24 DOI:10.1680/jensu.22.00059
K. Kumar, K. Kapoor, R. Singh, Paramveer Singh
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引用次数: 1

Abstract

This study presents utilisation of High-Volume Fly Ash (HVFA) in design of Self-Compacting Concrete (SCC) containing alternative aggregate particles. The class-F Fly Ash was used in a binary blend of Portland Cement at a fixed dosage of 50% by weight of powder and natural coarse and fine aggregates were replaced with coarse and fine Recycled Concrete Aggregates (RCAs), respectively, at replacement levels of 0%, 50% and 100% by volume. Durability properties of the SCC mixes were studied using rapid chloride penetration test, initial surface absorption test and capillary suction test. Results of the study showed that concrete mix made with replacement of natural coarse aggregates with 50% coarse RCAs, concrete mix made replacement of natural fine aggregates with 50% fine RCAs and concrete mix made with replacement of both natural coarse and fine aggregates with the respective RCAs at 50% replacement level exhibits satisfactory performance without compromising their fresh and hardened state properties. Furthermore, the incorporation of HVFA in SCCs improved the hardened state properties at later ages of curing due to the secondary pozzolanic reaction.
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含大体积粉煤灰和替代骨料的自密实混凝土耐久性性能
本研究提出了利用大体积粉煤灰(HVFA)设计自密实混凝土(SCC)含有替代骨料颗粒。将f类粉煤灰用于波特兰水泥的二元混合料中,按粉末重量的固定剂量为50%,并用粗粒和细粒再生混凝土骨料(RCAs)分别以0%、50%和100%的体积替代天然粗粒和细粒骨料。采用快速氯化物渗透试验、初始表面吸收试验和毛细吸力试验研究了SCC混合料的耐久性能。研究结果表明,用50%粗RCAs替代天然粗骨料制成的混凝土配合比,用50%细RCAs替代天然细骨料制成的混凝土配合比,以及分别用50%替代水平的RCAs替代天然粗骨料和细骨料制成的混凝土配合比,在不影响其新鲜和硬化状态性能的情况下,表现出令人满意的性能。此外,由于二次火山灰反应,在SCCs中掺入HVFA改善了固化后期的硬化状态性能。
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来源期刊
CiteScore
3.70
自引率
16.70%
发文量
44
审稿时长
>12 weeks
期刊介绍: Engineering Sustainability provides a forum for sharing the latest thinking from research and practice, and increasingly is presenting the ''how to'' of engineering a resilient future. The journal features refereed papers and shorter articles relating to the pursuit and implementation of sustainability principles through engineering planning, design and application. The tensions between and integration of social, economic and environmental considerations within such schemes are of particular relevance. Methodologies for assessing sustainability, policy issues, education and corporate responsibility will also be included. The aims will be met primarily by providing papers and briefing notes (including case histories and best practice guidance) of use to decision-makers, practitioners, researchers and students.
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