Effect of extended mellowing on strength and swelling behavior of a high sulfated soil

IF 1.3 Q3 ENGINEERING, GEOLOGICAL

Proceedings of the Institution of Civil Engineers-Ground Improvement Pub Date : 2022-05-16 DOI:10.1680/jgrim.22.00017

Rubén Alejandro Quiñónez Samaniego, G. Bruschi, H. C. Scheuermann Filho, Mariana Tonini de Araújo, L. Festugato, N. Consoli

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引用次数: 2

Abstract

Troublesome events are related to the stabilization of sulfate-rich soils with calcium-based materials. To overcome these inconveniences, researches have been conducted applying modified and alternative treatments to soils containing low and high sulfate levels. This paper intends to assess the effects of mellowing period (2 and 4 days), Portland cement content (5%, 7% and 9%), density (15.75kN.m−3, 16.60kN.m−3, and 17.50kN.m−3) and curing time (14 and 28 days) on the performance of a clayey soil from the Paraguayan Chaco region containing high amounts of sulfates. A complete factorial design set was carried out to assess the unconfined compressive strength and the one-dimensional free vertical swelling of compacted soil-cement-lime mixtures. Results showed a positive effect of the mellowing period relative to the swelling of the stabilized soil. In addition, the curing period, the amount of cement and the dry unit weight were the most influential factors regarding the unconfined compressive strength. The stabilization method addressed in this research, i.e., extended mellowing combined with lime and Portland cement, seems to be of great importance for practical purposes on the stabilization of soils containing high amounts of sulfates.

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延长软化对高硫酸盐土强度和膨胀特性的影响

麻烦的事件与钙基材料稳定富含硫酸盐的土壤有关。为了克服这些不便，人们对高、低硫酸盐土壤进行了改良和替代处理研究。本文拟对软化期(2天和4天)、波特兰水泥掺量(5%、7%和9%)、密度(15.75kN)等因素的影响进行评价。m−3、16.60 kn。m−3和17.50kN.m−3)和固化时间(14天和28天)对含有大量硫酸盐的巴拉圭查科地区粘土的性能的影响。采用全因子设计对土-水泥-石灰混合料的无侧限抗压强度和一维自由垂直膨胀进行了评价。结果表明，相对于稳定土的膨胀，软化期有积极的影响。此外，养护时间、水泥掺量和干重是影响无侧限抗压强度的主要因素。本研究中提出的稳定方法，即石灰和波特兰水泥的延伸软化，似乎对含有大量硫酸盐的土壤的稳定具有重要的实际意义。

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

Proceedings of the Institution of Civil Engineers-Ground Improvement ENGINEERING, GEOLOGICAL-

CiteScore

3.10

自引率

8.30%

发文量

期刊介绍： Ground Improvement provides a fast-track vehicle for the dissemination of news in technological developments, feasibility studies and innovative engineering applications for all aspects of ground improvement, ground reinforcement and grouting. The journal publishes high-quality, practical papers relevant to engineers, specialist contractors and academics involved in the development, design, construction, monitoring and quality control aspects of ground improvement. It covers a wide range of civil and environmental engineering applications, including analytical advances, performance evaluations, pilot and model studies, instrumented case-histories and innovative applications of existing technology.