Soft Clay Modified with Municipal Solid Waste and Stabilized with Nano-MgO for Pavement Subgrade and Embankment Fill Applications

IF 4.9 2区工程技术 Q1 ENGINEERING, CIVIL

Transportation Geotechnics Pub Date : 2024-05-01 DOI:10.1016/j.trgeo.2024.101261

Ali Ohadian , Navid Khayat , Mehdi Mokhberi , Suksun Horpibulsuk

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引用次数: 0

Abstract

Municipal solid waste (MSW) is the largest group of non-hazardous waste. Four percentages of MSW replacement (15 %, 25 %, 35 %, and 45 % by weight) were used for chemical modification of soft clay at 1, 14, and 28 days of curing. The MSW replacement at optimum (15 % and 25 %) to the clay enhanced unconfined compressive strength (UCS) and California bearing ratio (CBR) by 1.28 and 3.34 times, respectively. Also, the nanomagnesium (Nano-MgO) was used as an additive at small contents i.e., 0.25, 0.5, 0.75, and 1 % to improve the mechanical properties of MSW-soft clay blends. The optimum MSW replacement ratios with 1 % Nano-MgO significantly improves UCS and CBR of the soft clay when compared to clay stabilized with 1 % Nano-MgO. The UCS and CBR improvement mechanism was investigated via microstructural analysis of the MSW-soft clay stabilized with Nano-MgO. The improved structure of stabilized specimens was found to be due to flocculation, cation exchange, and cementation bond formation with brucite mineral. However, the X-ray diffraction tets results indicated the presence of the Palygorskite mineral in the specimen containing very high MSW replacement ratio, which retarded the Nano-MgO stabilization process. At optimum MSW replacement ratio (15 % and 25 %), Nano-MgO could effectively improve mechanical properties of soft clay for sustainable road construction.

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用城市固体废弃物改性并用纳米氧化镁稳定的软粘土在路面基层和路堤填料中的应用

城市固体废物（MSW）是最大的一类无害废物。在软粘土固化 1、14 和 28 天时，使用了四种比例的城市固体废物替代物（按重量计分别为 15%、25%、35% 和 45%）对其进行化学改性。以最佳比例（15 % 和 25 %）添加到粘土中的城市固体废弃物分别提高了无压抗压强度（UCS）和加州承载比（CBR）的 1.28 倍和 3.34 倍。此外，纳米镁（Nano-MgO）作为添加剂，以较小的含量（即 0.25%、0.5%、0.75% 和 1%）改善了 MSW-软粘土混合物的机械性能。与使用 1 % 纳米氧化镁稳定的粘土相比，使用 1 % 纳米氧化镁的最佳城市固体废弃物替代率可明显改善软粘土的 UCS 和 CBR。通过对使用纳米氧化镁稳定的 MSW 软粘土进行微观结构分析，研究了其 UCS 和 CBR 改善机理。研究发现，稳定试样结构的改善是由于絮凝、阳离子交换以及与青金石矿物形成胶结键。然而，X 射线衍射测试结果表明，在含有极高的 MSW 替代率的试样中，存在白云石矿物，这阻碍了纳米氧化镁的稳定过程。在最佳的 MSW 替代率（15% 和 25%）下，纳米氧化镁可有效改善软粘土的机械性能，从而实现可持续的道路建设。

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

Transportation Geotechnics Social Sciences-Transportation

CiteScore

8.10

自引率

11.30%

发文量

194

审稿时长

51 days

期刊介绍： Transportation Geotechnics is a journal dedicated to publishing high-quality, theoretical, and applied papers that cover all facets of geotechnics for transportation infrastructure such as roads, highways, railways, underground railways, airfields, and waterways. The journal places a special emphasis on case studies that present original work relevant to the sustainable construction of transportation infrastructure. The scope of topics it addresses includes the geotechnical properties of geomaterials for sustainable and rational design and construction, the behavior of compacted and stabilized geomaterials, the use of geosynthetics and reinforcement in constructed layers and interlayers, ground improvement and slope stability for transportation infrastructures, compaction technology and management, maintenance technology, the impact of climate, embankments for highways and high-speed trains, transition zones, dredging, underwater geotechnics for infrastructure purposes, and the modeling of multi-layered structures and supporting ground under dynamic and repeated loads.