当前位置: X-MOL 学术Road Mater. Pavement Design › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Compaction delay and its effect on the geotechnical properties of lime treated semi-arid soils
Road Materials and Pavement Design ( IF 3.7 ) Pub Date : 2020-07-02 , DOI: 10.1080/14680629.2020.1784256
Arif Ali Baig Moghal 1 , Mohammed Ashfaq 1 , Ali Abdul Kareem Hamood Al-Obaid 2 , Mohammad Farid Abbas 3, 4 , Ahmed Mohammed Al-Mahbashi 2 , Abdullah Ali Shaker 2
Affiliation  

Quality construction control requires ensuring that compacted fills are properly placed without any significant delay between mixing and compaction of the wet soil mixture. When chemical treatment is resorted to meet the shortcomings in the use of locally available materials, the delay in compaction (time elapsed between mixing and compaction of the wet soil mixture) plays a significant role as it dictates the final in-site density values achieved. In this study, the effect of delay in compaction on the density and moisture content relationships was evaluated for the delay periods of 1hr, 4hr, 24 hr and 7 days. The study was even extended to lime treated soils (at 2% and 4% by dry weight of soil). The time lag which occurs immediately after the onset of wet mixing and compaction often results in variation in geotechnical properties. Accordingly, an attempt was also made to study the effect of delay in compaction on the hydraulic conductivity, compressibility and unconfined compressive strength (UCS) behaviour of plastic clays sourced from the semi-arid region. In order to understand the variations in microstructure, MIP tests (Mercury Intrusion Porosimetry) were conducted at higher delay periods when treated with lime. From the results, it was observed that delay in compaction led to an increase in the hydraulic conductivity and compressibility of both soils. Furthermore, the UCS of both the soils showed a decreasing trend with the increase in the delay period. The agglomeration of clay particles leads to the formation of clods at higher delay periods which resist the compaction energy resulting in reduced density values which in-turn affect the geotechnical properties.



中文翻译:

压实延迟及其对石灰处理过的半干旱土壤岩土特性的影响

质量施工控制要求确保正确放置压实的填充物,在湿土壤混合物的混合和压实之间没有任何明显的延迟。当采用化学处理来解决使用当地可用材料的缺点时,压实延迟(湿土壤混合物的混合和压实之间经过的时间)起着重要作用,因为它决定了所达到的最终现场密度值。在这项研究中,在 1 小时、4 小时、24 小时和 7 天的延迟期间,评估了压实延迟对密度和含水量关系的影响。该研究甚至扩展到石灰处理的土壤(按土壤干重计 2% 和 4%)。湿拌和压实开始后立即发生的时间滞后通常会导致岩土特性的变化。因此,还尝试研究压实延迟对源自半干旱地区的塑性粘土的导水率、可压缩性和无侧限抗压强度 (UCS) 行为的影响。为了了解微观结构的变化,当用石灰处理时,MIP 测试(水银侵入孔隙率测定法)在较长的延迟期间进行。从结果可以看出,压实延迟导致两种土壤的导水率和可压缩性增加。此外,随着延迟时间的增加,两种土壤的UCS均呈下降趋势。粘土颗粒的团聚导致在较高延迟时间形成土块,从而抵抗压实能量,导致密度值降低,进而影响岩土特性。

更新日期:2020-07-02
down
wechat
bug