Potential use of phosphogypsum in paving blocks

IF 1.8 4区 材料科学 Q4 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY
Green Materials Pub Date : 2021-09-13 DOI:20.00001
Abdessattar Hamdi, Nejib Ben Jamaa, Imen Kallel Kammoun
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引用次数: 0

Abstract

The present work aims to contribute to finding more recycling routes for phosphogypsum (PG) and its potential uptake in the material construction industry as paving blocks. Laboratory testing was conducted to formulate mixes using PG as fine sand replacement. An optimal 20% substitution rate was proved. Industrially processed paving blocks were made for high-quality experimental investigation. The most interesting testing results of PG paving blocks are the low water absorption coefficient of 5.7% and excellent mechanical properties, including high compressive and flexural strengths at early age (20.7 and 4.65 MPa at 7 days, respectively). Compressive strength evolves with respect to the curing period: 26% increase at 28 days and 36% increase at 90 days; flexural strength evolves from 6% at 28 days to 10% at 90 days. The leaching test showed low levels of heavy metals released, and their concentrations were lower in the mix than in the raw PG. For all the aforementioned results, PG waste from a phosphate plant in Gabès, Tunisia was proved to have high potential for reuse in the manufacturing of paving blocks with low health risks and excellent properties. Reusing PG waste in paving blocks would thus contribute to solving an environmental issue and reduce the use of sand, which is prone to depletion as a non-renewable resource.
磷石膏在铺路砖中的潜在用途
目前的工作旨在为磷石膏(PG)找到更多的回收途径及其在建筑材料行业中作为铺路砖的潜力。用PG代替细砂进行了室内试验。最优替代率为20%。为进行高质量的实验研究,制作了工业加工的铺路砖。PG铺装块最有趣的测试结果是吸水系数低,为5.7%,力学性能优异,早期抗压强度和抗折强度高(7天时分别为20.7 MPa和4.65 MPa)。抗压强度随龄期的变化规律:龄期28天增加26%,龄期90天增加36%;抗弯强度从28天的6%发展到90天的10%。浸出试验表明,重金属释放水平较低,混合物中的重金属浓度低于原料PG中的重金属浓度。对于上述所有结果,证明来自突尼斯gabs一家磷肥厂的PG废物具有很高的再利用潜力,可用于制造具有低健康风险和优异性能的铺路砖。因此,在铺路砖中再利用PG废物将有助于解决环境问题,并减少沙子的使用,因为沙子是一种不可再生资源,容易枯竭。
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
Green Materials
Green Materials Environmental Science-Pollution
CiteScore
3.50
自引率
15.80%
发文量
24
期刊介绍: The focus of Green Materials relates to polymers and materials, with an emphasis on reducing the use of hazardous substances in the design, manufacture and application of products.
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