Investigating the Consolidation Behaviour of Cement-Bentonite Barrier Materials Containing PFA and GGBS

Q3 Engineering

Open Civil Engineering Journal Pub Date : 2023-03-01 DOI:10.28991/cej-2023-09-03-02

M. A. Walenna

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引用次数: 0

Abstract

Cement-Bentonite (CB) barriers are expected to become a sustainable and reliable engineering solution. The deformation of CB is of interest to engineers to comprehend, particularly how CB responds to changes in loading during its construction and service life. The purpose of this study was to examine how samples of CB mixtures behaved during consolidation. This study investigated: (1) the influence of curing time and constituent materials on the consolidation properties of CB samples, (2) the volumetric change and the rate of volumetric change in response to a specific loading condition via consolidation tests. For this purpose, a laboratory consolidation test with a load range of 50 to 3200 kPa was carried out in accordance with BS 1377-7:1990 using the oedometer apparatus. This study discovered that the consolidation characteristics of CB samples are similar to those of overconsolidated soil. The CB sample became more resistant to consolidation under varying loads as curing progressed. The presence of more bentonite resulted in an increase in the recompression index. The inclusion of GGBS contributed to the consolidation characteristics of CB through the following mechanisms: (1) the significant decrease of the degree of consolidation with a curing period longer than 28 days, despite the slow strength development of the early-age curing; (2) the increase of the preconsolidation pressure; and the addition of GGBS was found to be more effective than the addition of more bentonite in increasing the preconsolidation pressure. Doi: 10.28991/CEJ-2023-09-03-02 Full Text: PDF

查看原文本刊更多论文

含PFA和GGBS的水泥-膨润土阻隔材料固结性能研究

水泥-膨润土(CB)屏障有望成为一种可持续、可靠的工程解决方案。CB的变形是工程师们感兴趣的，特别是CB在施工和使用寿命期间对载荷变化的响应。本研究的目的是研究炭黑混合物样品在固结过程中的表现。本研究通过固结试验研究了:(1)固化时间和组成材料对炭黑试样固结性能的影响;(2)在特定加载条件下的体积变化率和体积变化率。为此，根据BS 1377- 7:20 90，使用里程表设备，在50至3200 kPa的载荷范围内进行了实验室固结试验。研究发现，CB试样的固结特性与超固结土相似。随着固化的进行，炭黑试样在不同载荷下的抗固结性增强。膨润土的存在导致再压缩指数的增加。GGBS的掺入对CB固结特性的影响机制如下:(1)尽管早期养护强度发展缓慢，但龄期大于28 d时，CB固结程度显著降低;(2)预固结压力增大;在提高预固结压力方面，添加GGBS比添加更多的膨润土更有效。Doi: 10.28991/CEJ-2023-09-03-02全文:PDF

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来源期刊

Open Civil Engineering Journal Engineering-Civil and Structural Engineering

CiteScore

1.90

自引率

0.00%

发文量

期刊介绍： The Open Civil Engineering Journal is an Open Access online journal which publishes research, reviews/mini-reviews, letter articles and guest edited single topic issues in all areas of civil engineering. The Open Civil Engineering Journal, a peer-reviewed journal, is an important and reliable source of current information on developments in civil engineering. The topics covered in the journal include (but not limited to) concrete structures, construction materials, structural mechanics, soil mechanics, foundation engineering, offshore geotechnics, water resources, hydraulics, horology, coastal engineering, river engineering, ocean modeling, fluid-solid-structure interactions, offshore engineering, marine structures, constructional management and other civil engineering relevant areas.