湿润和干燥周期对荼秸灰稳定膨胀土行为的影响

IF 1.5 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY
Sisay Birhanu Moges, Eleyas Assefa, S. M. Assefa
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引用次数: 0

摘要

本研究探讨了湿润和干燥循环对茶草灰稳定膨胀土的影响,重点是提高其在路基应用中的机械性能。膨胀土的特点是持续膨胀和收缩,需要通过循环测试来建立平衡和临界密度。研究了茶草灰对土壤破坏的缓解作用及其对膨胀土机械属性的影响。根据 AASHTO 和 USCS 标准,实验室结果将天然膨胀土分别归类为 A-7-5 和 CH。使用一维里程计仪器,对茶草灰稳定膨胀土进行了六次湿润-干燥循环,以观察其在平衡状态下的行为。扫描电子显微镜显示,土壤颗粒与茶草灰之间存在无序粘结,随着湿润-干燥循环次数的增加,这种无序粘结会加剧。对不同固化时间的样品进行了 X 射线衍射分析,结果表明,随着固化时间的延长,阳离子交换和胶凝反应会加剧,从而降低土壤的膨胀性。96 小时袜状加利福尼亚承载比(CBR)测试评估了路基强度。天然土壤的 CBR 值低于埃塞俄比亚道路管理局(ERA)对小容量道路的标准。与此相反,用 10%、15% 和 20% 的茶草灰稳定的膨胀性土壤的 CBR 值大幅提高(分别为 3.7、6.7 和 8.9),达到了埃塞俄比亚公路局的标准。这表明,红茶秸秆灰稳定剂可使膨胀性土壤适用于低容量路基,符合 ERA 标准。这项综合研究为茶草灰作为膨胀性土壤的有效稳定剂的潜在用途提供了宝贵的见解,为膨胀性土壤地区的道路建设提供了可持续的解决方案。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of Wetting and Drying Cycle on the Behavior of Teff Straw Ash-Stabilized Expansive Soil
This study explores the impact of wetting and drying cycles on teff straw ash-stabilized expansive soil, with a focus on enhancing its mechanical properties for road subgrade applications. Expansive soil, characterized by continuous swell and shrink behavior, undergoes cyclic testing to establish equilibrium and critical density. The mitigating effects of teff straw ash on soil damage and its influence on expansive soil’s mechanical attributes are investigated. Laboratory results classify natural expansive soil as A-7-5 and CH according to AASHTO and USCS standards, respectively. Using a one-dimensional odometer apparatus, six wetting–drying cycles are conducted on teff straw ash-stabilized expansive soil to observe its behavior at equilibrium. Scanning electron microscopy reveals a disordered bond between soil particles and teff straw ash, intensifying with increased wetting–drying cycles. X-ray diffraction analysis is performed on samples subjected to different curing times, indicating heightened cation exchange and pozzolanic reactions as curing duration increases, thereby reducing soil expansiveness. A 96-hr socked California Bearing Ratio (CBR) test assesses subgrade strength. The CBR values for natural soil fall below the Ethiopian Road Authority (ERA) standards for low-volume roads. In contrast, expansive soil stabilized with teff straw ash at 10%, 15%, and 20% exhibits substantial increases in CBR values (3.7, 6.7, and 8.9, respectively), meeting the ERA standards. This suggests that teff straw ash stabilization renders expansive soil suitable for low-volume road subgrades, aligning with ERA standards. This comprehensive study provides valuable insights into the potential use of teff straw ash as an effective stabilizer for expansive soils, offering sustainable solutions for road construction in regions characterized by expansive soil challenges.
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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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