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粒度和孔隙率/粘结剂指数对哥伦比亚胶结砂无侧限抗压强度、刚度及微观结构的影响

Effect of Grain Size and Porosity/Binder Index on the Unconfined Compressive Strength, Stiffness and Microstructure of Cemented Colombian Sands.

作者信息

López Luis Carlos Suárez, Vergara Jesús Alberto Alcalá, de la Rosa Yamid E Nuñez, Arrieta Alvaro, Baldovino Jair de Jesús Arrieta

机构信息

Civil Engineering Program, Universidad de Cartagena, Cartagena de Indias 130015, Colombia.

Faculty of Engineering and Basic Sciences, Fundación Universitaria Los Libertadores, Bogota 110231, Colombia.

出版信息

Materials (Basel). 2024 Oct 24;17(21):5193. doi: 10.3390/ma17215193.

DOI:10.3390/ma17215193
PMID:39517469
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11547140/
Abstract

Artificial cementation of granular soils results in improved stabilization, increased stiffness, and greater mechanical strength. The porosity index and volumetric cement content η/Civa is presented as a key measure to study the evolution of different soil stabilization types. However, this index had not been previously studied or adjusted for sands in Colombia. Therefore, this study evaluates the applicability of the η/Civa index on unconfined compressive strength (qu) and stiffness (Go), complemented by microstructural analysis, in four sandy soils from Luruaco (Atlántico), Lorica (Córdoba), Medellín (Antioquia), and Bogotá D.C. The soils were stabilized with Type III Portland cement in dosages of 3%, 5%, 7%, and 9%, and subjected to UCS, ultrasound, and SEM-EDS tests after a curing period of 7 days. It was found that increasing cement content results in higher qu values for the samples, and higher molding density also leads to higher qu values. Additionally, the grain size distribution influenced the adjustment of parameter "". In the sands from Bogotá and Lorica, with high uniformity, the value of "" was 1.00. In contrast, mineralogy and particle shape played a predominant role in the sands from Medellín and Luruaco, where the coefficient of uniformity is higher, suggesting a possible inverse relationship between particle angularity and the value of "".

摘要

粒料土的人工胶结可提高稳定性、增加刚度并增强机械强度。孔隙率指数和体积水泥含量η/Civa被作为研究不同土壤稳定类型演变的关键指标。然而，此前尚未针对哥伦比亚的砂土对该指标进行研究或调整。因此，本研究评估了η/Civa指标在无侧限抗压强度（qu）和刚度（Go）方面的适用性，并辅以微观结构分析，研究对象为来自鲁拉科（大西洋省）、洛里卡（科尔多瓦省）、麦德林（安蒂奥基亚省）和波哥大特区的四种砂土。使用III型波特兰水泥对土壤进行稳定处理，水泥用量分别为3%、5%、7%和9%，养护7天后进行无侧限抗压强度试验、超声测试和扫描电子显微镜-能谱分析测试。研究发现，增加水泥含量会使样品的qu值更高，更高的成型密度也会导致更高的qu值。此外，粒度分布会影响参数“”的调整。在均匀性较高的波哥大和洛里卡的砂土中，“”的值为1.00。相比之下，在均匀系数较高的麦德林和鲁拉科的砂土中，矿物学和颗粒形状起主要作用，这表明颗粒棱角性与“”的值之间可能存在反比关系。

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