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使用水泥-脱硫石膏混合物稳定高黏土含量红土用于道路基层应用

Stabilized High Clay Content Lateritic Soil Using Cement-FGD Gypsum Mixtures for Road Subbase Applications.

作者信息

Maichin Phattharachai, Jitsangiam Peerapong, Nongnuang Toon, Boonserm Kornkanok, Nusit Korakod, Pra-Ai Suriyavut, Binaree Theechalit, Aryupong Chuchoke

机构信息

Department of Civil Engineering, Faculty of Engineering, Chiang Mai University, Huai Kaew Road, Mueang, Chiang Mai 50200, Thailand.

Center of Excellence in Natural Disaster Management, Department of Civil Engineering, Faculty of Engineering, Chiang Mai University, Huai Kaew Road, Mueang, Chiang Mai 50200, Thailand.

出版信息

Materials (Basel). 2021 Apr 8;14(8):1858. doi: 10.3390/ma14081858.

DOI:10.3390/ma14081858
PMID:33918054
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8069758/
Abstract

With a lack of standard lateritic soil for use in road construction, suitable economical and sustainable soil-stabilization techniques are in demand. This study aimed to examine flue gas desulfurization (FGD) gypsum, a by-product of coal power plants, for use in soil-cement stabilization, specifically for ability to strengthen poor high-clay, lateritic soil but with a lower cement content. A series of compaction tests and unconfined compressive strength (UCS) tests were performed in conjunction with scanning electron microscope (SEM) analyses. Therefore, the strength development and the role of FGD gypsum in the soil-cement-FGD gypsum mixtures with varying cement and FGD gypsum contents were characterized in this study. The study results showed that adding FGD gypsum can enhance the strength of the stabilized substandard lateritic soil. Extra FGD gypsum added to the cement hydration system provided more sulfate ions, leading to the formation of ettringite and monosulfate, which are the hardening cementitious products from the cement hydration reaction. Both products contributed to the strength gain of the soil-cement-FGD gypsum material. However, the strength can be reduced when too much FGD gypsum is added because the undissolved gypsum has a weak structure. Examinations of FGD gypsum in the soil-cement-FGD gypsum mixtures by SEM confirmed that adding FGD gypsum can reduce the cement content in a soil-cement mix to achieve a given UCS value.

摘要

由于缺乏用于道路建设的标准红土，因此需要合适的经济且可持续的土壤稳定技术。本研究旨在考察燃煤电厂的副产品——烟气脱硫（FGD）石膏在土壤 - 水泥稳定化中的应用，特别是考察其增强劣质高粘土红土且降低水泥含量的能力。结合扫描电子显微镜（SEM）分析进行了一系列压实试验和无侧限抗压强度（UCS）试验。因此，本研究对不同水泥和FGD石膏含量的土壤 - 水泥 - FGD石膏混合物中强度发展以及FGD石膏的作用进行了表征。研究结果表明，添加FGD石膏可以提高稳定化不合格红土的强度。添加到水泥水化体系中的额外FGD石膏提供了更多的硫酸根离子，导致钙矾石和单硫型水化硫铝酸钙的形成，它们是水泥水化反应的硬化胶凝产物。这两种产物都有助于土壤 - 水泥 - FGD石膏材料强度的增加。然而，当添加过多FGD石膏时强度会降低，因为未溶解的石膏结构较弱。通过SEM对土壤 - 水泥 - FGD石膏混合物中的FGD石膏进行检测证实，添加FGD石膏可以降低土壤 - 水泥混合物中的水泥含量以达到给定的UCS值。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1ed3/8069758/7525e90b2c0b/materials-14-01858-g017.jpg
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