Investigation of mechanical and durability properties of concrete made with a mixture of waste foundry sand and domestic treated wastewater

IF 1.6 Q3 ENGINEERING, CIVIL Australian Journal of Civil Engineering Pub Date : 2022-06-07 DOI:10.1080/14488353.2022.2083287
Asadollahfardi Gholamreza, Mojtaba Tayebi Jebeli, Amir Abbasi Khalil, H. Shahir
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引用次数: 2

Abstract

ABSTRACT Two crucial and challenging issues that threaten the environment are the significant amount of drinking water for concrete production and the vast quantity of waste foundry sand (WFS) generated each year. Using WFS and treated wastewater (TW) in concrete instead of sand and drinking water is a new method for solid waste recycling and water reuse. In this research study, two types of concrete mixtures were made by partial replacement of natural sand with WFS, and simultaneously using both the WFS and the TW as a part of sand and drinking water. Then, the mechanical properties and durability of mixtures were determined. The results indicated that increasing WFS and TW ratios decreased the workability of concrete. The sample contained 20% WFS plus 50% TW (W20-TW50) showed the best results, which increased compressive strength by 33.9, 19.2, and 6.2% at the age of 7, 28, and 90 days respectively, and decreased 30- minute and 24- hour water adsorption by 10.6 and 14.3% compared to the control samples. Furthermore, using WFS and TW simultaneously in concrete did not significantly impact on ultrasonic pulse velocity and rapid chloride migration. Scanning electron microscopy images indicated that the W20-TW50 sample had the best structural density and lowest pores.
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废铸造砂与生活废水混合配制混凝土的力学性能和耐久性研究
摘要:混凝土生产中大量的饮用水和每年产生的大量废铸造砂是威胁环境的两个关键和具有挑战性的问题。将WFS和处理过的废水(TW)用于混凝土中代替沙子和饮用水是固体废物回收和水再利用的一种新方法。在本研究中,通过用WFS部分替代天然砂,并同时使用WFS和TW作为砂和饮用水的一部分,制备了两种类型的混凝土混合物。然后,测定了混合物的力学性能和耐久性。结果表明,增加WFS和TW的比例会降低混凝土的工作性能。含20%WFS和50%TW的样品(W20-TW50)显示出最好的结果,与对照样品相比,在7天、28天和90天时的抗压强度分别提高了33.9%、19.2%和6.2%,30分钟和24小时的吸水率分别降低了10.6%和14.3%。此外,在混凝土中同时使用WFS和TW对超声波脉冲速度和氯离子快速迁移没有显著影响。扫描电子显微镜图像表明,W20-TW50样品具有最佳的结构密度和最低的孔隙。
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CiteScore
3.90
自引率
7.70%
发文量
31
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