磷石膏作为添加剂用于稳定软质高岭土的潜力:增强地基层

IF 2.7 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Dounia Azerkane, Meriam El Ouahabi, Achraf Harrou, Faiçal El Khazanti, El Khadir Gharibi
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引用次数: 0

摘要

通过水工石灰的化学稳定可以提高粘性土的抗剪性能。研究了磷石膏(PG)废料和石灰对软质高岭土的稳定作用。这种方法通过将PG废物整合到富含高岭土中来提高其稳定性,从而重新利用通常储存在桩中的PG废物。采用结构、微观、岩土和力学表征技术来加深对土壤稳定机制及其在道路建设中的潜在应用的理解。高岭石与石灰缺乏火山灰反应性,但土壤中的结晶和无定形硅铝酸盐促进水化硅酸钙凝胶的形成,从而将土壤颗粒粘结在一起。将PG添加到土壤-石灰混合物中,可以通过钙矾石和CSH凝胶的形成以及磷石膏的结晶针状来稳定土壤。机械抗压强度由90%土+ 10%石灰的原土砂浆的0.35 MPa提高到68%土+ 10%石灰+ 32% PG的混合料的0.80 MPa,在高岭土中添加PG获得的抗压机械强度超过了道路路面结构设计要求的最小阈值0.66 MPa。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Potential use of phosphogypsum as an additive for stabilizing soft kaolinite soils: enhancement of the foundation layer

The shear resistance of clayey soils can be improved through chemical stabilization with hydraulic lime. This study examines the stabilization of soft kaolin clayey soils by adding phosphogypsum (PG) waste and lime. This approach reuse of PG waste, typically stored in piles, by integrating it into kaolin-rich soils to improve their stability. Structural, microscopic, geotechnical, and mechanical characterization techniques were employed to enhance the understanding of soil stabilization mechanisms and their potential applications in road construction. Kaolinite lacks pozzolanic reactivity with lime, but crystalline and amorphous aluminosilicates in the soil facilitate the formation of calcium silicate hydrate (CSH) gel, which binds soil particles cohesively. The addition of PG to the soil-lime mixture allows soil stabilization through the formation of ettringite and CSH gel, and the crystalline needle-like of phosphogypsum. The mechanical compressive strength increases from 0.35 MPa for raw earth mortar consisting of 90% soil and 10% lime to 0.80 MPa for a mixture consisting of 68% soil, 10% lime and 32% PG. The compressive mechanical strength obtained by adding PG to kaolin clay exceeds the minimum threshold of 0.66 MPa required for the structural design of road pavements.

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来源期刊
CiteScore
5.30
自引率
16.10%
发文量
205
审稿时长
4.8 months
期刊介绍: The Journal of Material Cycles and Waste Management has a twofold focus: research in technical, political, and environmental problems of material cycles and waste management; and information that contributes to the development of an interdisciplinary science of material cycles and waste management. Its aim is to develop solutions and prescriptions for material cycles. The journal publishes original articles, reviews, and invited papers from a wide range of disciplines related to material cycles and waste management. The journal is published in cooperation with the Japan Society of Material Cycles and Waste Management (JSMCWM) and the Korea Society of Waste Management (KSWM).
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