Reduction of pavement thickness using a subgrade layer treated by different techniques

IF 0.5 Q3 ENGINEERING, MULTIDISCIPLINARY

Acta Polytechnica Pub Date : 2022-10-31 DOI:10.14311/ap.2022.62.0567

R. Zehawi, Y. A. Kareem, Emad Y. Khudhair

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引用次数: 0

Abstract

A range of stabilisers for poor quality subgrade soils have been developed to promote road constructions. Many of them are becoming more popular depending on their effectiveness. The purpose behind this research is to identify the relative efficacy of many physical and chemical stabilisation techniques for enhancing the properties of three types of local Iraqi subgrade soils. The comparison of the samples is based on the CBR tests. The AASHTO (1993) flexible pavement design was used to compute the pavement thickness requirements. The soil samples A, B and C have a natural CBR values of 3.8, 3.9 and 4, respectively, on which the physical stabilisers of Powdered rock (PR), grained recycled concrete (GRC), and recycled crumb rubber grains (CR) were employed, while Quicklime (QL) and activated fly ash (AFA) were both utilised as chemical stabilisers. The stabilisation with 15 % of AFA proved to be the most applicable method for soil types A and B for reducing the pavement thickness requirements by 51 % and 32 %, respectively, with a reasonable financial feasibility for both. The same feasibility is proven when stabilising soil type C with 15 % of GRC, which reduces the pavementthickness by 25.7 %.

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采用不同技术处理的路基层降低路面厚度

已经开发了一系列用于劣质路基土壤的稳定剂，以促进道路建设。它们中的许多正变得越来越受欢迎，这取决于它们的有效性。这项研究的目的是确定许多物理和化学稳定技术对提高伊拉克当地三种路基土壤性质的相对效力。样本的比较基于CBR试验。AASHTO（1993）柔性路面设计用于计算路面厚度要求。土壤样品A、B和C的天然CBR值分别为3.8、3.9和4，其上使用了粉状岩石（PR）、颗粒再生混凝土（GRC）和再生橡胶屑颗粒（CR）的物理稳定剂，而生石灰（QL）和活性粉煤灰（AFA）均用作化学稳定剂。15%的AFA稳定被证明是A和B类土壤最适用的方法，可将路面厚度要求分别降低51%和32%，这两种方法在财务上都具有合理的可行性。当用15%的GRC稳定C类土壤时，也证明了同样的可行性，这将使路面厚度减少25.7%。

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

Acta Polytechnica ENGINEERING, MULTIDISCIPLINARY-

CiteScore

1.90

自引率

12.50%

发文量

审稿时长

24 weeks

期刊介绍： Acta Polytechnica is a scientific journal published by CTU in Prague. The main title, Acta Polytechnica, is accompanied by the subtitle Journal of Advanced Engineering, which defines the scope of the journal more precisely - Acta Polytechnica covers a wide spectrum of engineering topics, physics and mathematics. Our aim is to be a high-quality multi-disciplinary journal publishing the results of basic research and also applied research. We place emphasis on the quality of all published papers. The journal should also serve as a bridge between basic research in natural sciences and applied research in all technical disciplines. The innovative research results published by young researchers or by postdoctoral fellows, and also the high-quality papers by researchers from the international scientific community, reflect the good position of CTU in the World University Rankings. We hope that you will ﬁnd our journal interesting, and that it will serve as a valuable source of scientiﬁc information.