Expansive clay subgrade soil improvement using municipal solid waste fly ash: Experimental and numerical approach

Q2 Environmental Science Environmental Challenges Pub Date : 2024-08-01 DOI:10.1016/j.envc.2024.100998
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引用次数: 0

Abstract

The expansive soil under investigation has caused damage to lightweight structures due to its swelling and shrinkage characteristics in response to changing moisture content. The study aims to assess the impact of municipal solid waste (MSW) fly ash on the engineering properties of subgrade expansive soils and its influence on pavement structure deformation. The influence of municipal solid waste fly ash on expansive soils was evaluated using laboratory tests and finite element methods. The Abaqus software was used to investigate the effects of MSW fly ash on pavement structure deformation. The input parameters employed for this analysis were elastic modulus, Poisson ratio, load, contact area dimension, and pavement layer thickness. To mitigate this issue, MSW fly ash was used as a stabilizing agent at varying percentages (5 %, 10 %, 15 %, 20 %, 25 %, and 30 % of the dry mass of the soil sample).According to the AASHTO soil classification, the soil is classified as A-7, has a high free swell, a low soaked CBR value, and a high soaked CBR swell, and does not meet the ERA manual standard for subgrade materials. The laboratory tests shown several improvements in the engineering properties of expansive soil when MSW fly ash were mixed. These improvements included a reduction of soaked CBR swelling, free swell index, plasticity index, specific gravity, optimum moisture content. Additionally, the maximum dry density and soaked CBR values increased. Numerical analysis using Abaqus software focused on vertical deformation of the pavement structure. The results showed that as the percentage of MSW fly ash in form 0 % to 25 % of soil dry weight, the vertical deformation of the pavement structure decreased from 0.84 mm to 0.67 mm. This demonstrates that the addition of MSW fly ash reduced the deformation of expansive sub-grade soil and improved the engineering qualities of pavement structure. In conclusion, the study revealed that the use of MSW fly ash as stabilizing agent effectively reduced the deformation of expansive subgrade soil and improved the engineering qualities of pavement structure.

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利用城市固体废物粉煤灰改良膨胀性粘土路基土壤:实验和数值方法
调查中的膨胀土由于其在含水量变化时的膨胀和收缩特性,对轻质结构造成了破坏。本研究旨在评估城市固体废物粉煤灰对基层膨胀土工程特性的影响及其对路面结构变形的影响。研究采用实验室测试和有限元方法评估了城市固体废物粉煤灰对膨胀土的影响。使用 Abaqus 软件研究了城市固体废弃物粉煤灰对路面结构变形的影响。分析中使用的输入参数包括弹性模量、泊松比、荷载、接触面积尺寸和路面层厚度。根据 AASHTO 土壤分类,该土壤属于 A-7,具有高自由膨胀、低浸透 CBR 值和高浸透 CBR 膨胀,不符合 ERA 手册中的基层材料标准。实验室测试表明,掺入 MSW 粉煤灰后,膨胀土的工程特性有了一些改善。这些改进包括降低了浸水 CBR 膨胀率、自由膨胀指数、塑性指数、比重和最佳含水量。此外,最大干密度和浸水 CBR 值也有所增加。使用 Abaqus 软件进行的数值分析侧重于路面结构的垂直变形。结果表明,随着城市固体废弃物粉煤灰占土壤干重的比例从 0% 增加到 25%,路面结构的垂直变形从 0.84 mm 减小到 0.67 mm。这表明,添加 MSW 粉煤灰可减少膨胀性路基土的变形,改善路面结构的工程质量。总之,研究表明,使用 MSW 粉煤灰作为稳定剂可有效减少膨胀性基层土的变形,改善路面结构的工程质量。
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来源期刊
Environmental Challenges
Environmental Challenges Environmental Science-Environmental Engineering
CiteScore
8.00
自引率
0.00%
发文量
249
审稿时长
8 weeks
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