应用环保型土工聚合物粘结剂提高膨胀土的强度和膨胀特性

IF 1.5 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY
Opu Chandra Debanath, Md. Aftabur Rahman, Sultan Mohammad Farook, Mohammed Russedul Islam
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引用次数: 0

摘要

膨胀性土壤在水分的作用下会明显膨胀,这往往会导致上层建筑的坍塌。在许多情况下,都会采用传统的稳定技术,尽管这种稳定技术的环境问题非常令人担忧。有鉴于此,我们尝试采用一种新方法来稳定不同类型的膨胀性土壤,这种方法使用了一种以粉煤灰为主要成分的非传统粘结剂土工聚合物。通过一系列实验室实验,确定了土工聚合物所占比例从 0% 到 30% 不等的处理土的工程特性。实验调查包括无压抗压强度、压实度、阿特伯极限和膨胀压力等测试。随着土工聚合物比例的增加,强度有了显著提高,膨胀压力也大大降低。此外,还进行了一系列加州承载比(CBR)测试,以评估其是否适合用于道路建设。经文献研究证明,稳定剂的最佳用量为 20%。此外,经过处理的样品的扫描电子显微镜(SEM)图像显示了土壤基质的微观结构变化,这与强度和膨胀行为的改善密切相关。因此,根据我们的实验结果,20% 的土工聚合物含量足以提高膨胀性土壤的工程特性,处理后的土壤可直接用作路基或基层材料。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Application of Ecofriendly Geopolymer Binder to Enhance the Strength and Swelling Properties of Expansive Soils
The expansive soil swells significantly in the presence of moisture, which often leads to the failure of superstructures. Conventional stabilization techniques are applied in many instances, although environmental issues are of significant concern for such stabilization. Keeping this in mind, an attempt is made to apply a new approach for stabilizing different types of expansive soils, treated with a nonconventional binder geopolymer that utilizes fly ash as the main ingredient. A series of laboratory experiments are run to determine the engineering properties of treated soils with varying percentages of geopolymer from 0% to 30%. The experimental investigation involved tests such as unconfined compressive strength, compaction, Atterberg limits, and swelling pressure. Significant strength development occurs with increasing percentages of geopolymer, and their swelling pressures decrease considerably. Additionally, a series of California Bearing Ratio (CBR) tests were undertaken to assess the suitability for road construction. The optimum dosage of the stabilizing agent is found to be 20%, as justified by studies in the literature. Furthermore, scanning electronic microscope (SEM) images of the treated samples revealed microstructural changes in the soil matrix, which strongly correlate with the improvement of strength and swelling behavior. Hence, based on our experimental results, 20% geopolymer content is sufficient for enhancing the engineering properties of expansive soils, and the treated soils can directly be used as subgrade or sub-base material.
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来源期刊
Advances in Civil Engineering
Advances in Civil Engineering Engineering-Civil and Structural Engineering
CiteScore
4.00
自引率
5.60%
发文量
612
审稿时长
15 weeks
期刊介绍: Advances in Civil Engineering publishes papers in all areas of civil engineering. The journal welcomes submissions across a range of disciplines, and publishes both theoretical and practical studies. Contributions from academia and from industry are equally encouraged. Subject areas include (but are by no means limited to): -Structural mechanics and engineering- Structural design and construction management- Structural analysis and computational mechanics- Construction technology and implementation- Construction materials design and engineering- Highway and transport engineering- Bridge and tunnel engineering- Municipal and urban engineering- Coastal, harbour and offshore engineering-- Geotechnical and earthquake engineering Engineering for water, waste, energy, and environmental applications- Hydraulic engineering and fluid mechanics- Surveying, monitoring, and control systems in construction- Health and safety in a civil engineering setting. Advances in Civil Engineering also publishes focused review articles that examine the state of the art, identify emerging trends, and suggest future directions for developing fields.
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