Comprehensive evaluation of carbonation and leaching reactions in lime-stabilised soils

Author:

Padmaraj Dhanalakshmi1ORCID,Arnepalli Dali Naidu1ORCID

Affiliation:

1. Department of Civil Engineering, Indian Institute of Technology Madras, Chennai, India

Abstract

The long-term performance of lime-stabilised earthworks is a major concern for the sustainability and durability of infrastructure. This paper presents a comprehensive investigation into the impact of carbonation and leaching on lime-stabilised soil by focusing on mechanical, chemical and microstructural changes. This study employed accelerated carbonation experiments with carbon dioxide levels at 3% for 7 days on lime-treated soil cured for up to 365 days. For leaching experiments, the treated samples were subjected to water percolation under a hydraulic head of 15 kPa for 14 pore volumes of flow. The results showed that carbonation reduced the compressive strength and stiffness of lime-treated soil, impacting its load-bearing capacity. The micro-level analyses revealed carbonation of cementitious gels and excess carbonate precipitation to cause a reduction in particle-to-particle bonding and loss of mechanical strength. The ingress of moisture into lime-stabilised soil led to leaching and the dissolution of cementitious gels. The effects of water percolation were insignificant for specimens cured for extended periods due to their reduced hydraulic conductivity, which resulted in enhanced cementation over leaching. Further, presaturation or treatment with a higher lime content reduced the extent of leaching. The study reveals that exposure of short-term-cured soil or soil treated with an inadequate lime content to carbon dioxide or moisture can affect their engineering properties, contrary to the design expectations.

Publisher

Emerald

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3