Influence of recycled fines on strength and alkali–silica reactivity in cement composites

IF 0.8 Q4 ENGINEERING, ENVIRONMENTAL

Proceedings of the Institution of Civil Engineers-Waste and Resource Management Pub Date : 2023-07-01 DOI:10.1680/jwarm.22.00002

Natália Salamoni, Gustavo Toigo, Joana Sousa-Coutinho

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Abstract

This study evaluated characteristics of mortars using recycled construction and demolition waste (CDW) from the industry as fine recycled aggregate in replacement of natural sand (NS). Mixes with replacements in volume of 20 and 100% CDW and a control mix with just NS were tested for their compressive and flexural strength and alkali–silica reactivity (ASR). For mechanical strength, experimental results showed satisfactory performance for 20% CDW content. Concerning the ASR test, mortars with CDW performed better than the control, demonstrating a general innocuous behaviour for ASR. Scanning electron microscopy and energy-dispersive X-ray analysis were performed on aggregate and mortar samples before and after the ASR test and confirmed the results, demonstrating that the attack was more severe in the samples with the greatest amount of siliceous material in the aggregate. The results demonstrate the viability of the use of CDW fine aggregate replacement in mortars, envisaging the possibility of its incorporation in concrete.

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再生细粉对水泥复合材料强度和碱-硅反应性的影响

本研究评估了用工业回收建筑和拆除垃圾(CDW)作为细再生骨料替代天然砂(NS)的砂浆特性。研究人员测试了含有20%和100% CDW替代品的混合物，以及只含有NS的对照混合物的抗压、抗折强度和碱-硅反应性(ASR)。在机械强度方面，试验结果表明，当CDW含量为20%时，力学性能较好。在ASR测试中，带有CDW的迫击炮的表现优于对照，显示出对ASR的一般无害行为。对ASR试验前后的骨料和砂浆样品进行扫描电镜和能量色散x射线分析，证实了结果，表明骨料中硅质物质含量最大的样品受冲击更严重。结果表明，使用CDW细骨料替代砂浆的可行性，设想其掺入混凝土的可能性。

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

Proceedings of the Institution of Civil Engineers-Waste and Resource Management ENGINEERING, ENVIRONMENTAL-

CiteScore

1.70

自引率

14.30%

发文量

期刊介绍： Waste and Resource Management publishes original research and practice papers on all civil engineering and construction related aspects of the resource management cycle, from the minimization of waste, through the re-use and recycling, to the management and disposal of residual wastes. Associated legislation, standards, socio-economic considerations and links with sustainable consumption and production are included. The range of subjects covered encompasses, but is not restricted to, strategies for reducing construction waste through better design, improved recovery and re-use, more efficient resource management, the performance of materials recovered from wastes, and, the procurement, planning, design, construction, operation and logistics of waste and resource management facilities.