Response surface methodology: a tool to optimise the contents of lime and polyethylene terephthalate (PET) fiber for stabilising a residual soil

IF 1.7 Q3 ENGINEERING, GEOLOGICAL

Geomechanics and Geoengineering-An International Journal Pub Date : 2021-07-26 DOI:10.1080/17486025.2021.1955155

Endene Emmanuel, Lee Li Yong, Nicholas Fogne Appiah, S. Gawu

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引用次数: 2

Abstract

ABSTRACT The possibility of stabilising a residual soil using lime and polyethylene terephthalate (PET) fibre by employing the central composite design technique in response surface methodology and using the desirability function to identify optimum additive combinations for the improvement in the strength properties of the treated soil was explored in this study. The effects of the independent variables (lime content, PET content, and curing duration) on the responses [unconfined compressive strength (UCS) and flexural strength (FS)] were investigated by analysis of variance (ANOVA). The results indicate that the developed mathematical models are statistically significant (p ≤ 0.05) through the analysis of variance, thus they are applicable for the optimisation process. Predicted values from the developed models were found to be in good agreement with their experimental counterparts. The optimum conditions were found to be 9% lime content, 1.9% PET fibre content, and 30 days curing duration, with a designated maximum desirability function (D = 0.996). Microstructural investigations revealed that the formation of calcium-aluminate-hydrate and calcium-silicate-hydrate were the key components liable for the improvement in the strength properties of the treated soil. The reported findings engaged the concurrent application of lime and PET fibre to improve the strength properties of residual soils.

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响应面法：一种优化石灰和聚对苯二甲酸乙二醇酯（PET）纤维含量以稳定残留土壤的工具

摘要:本研究探讨了利用石灰和聚对苯二甲酸乙二醇酯(PET)纤维稳定残余土壤的可能性，方法是采用响应面方法中的中心复合设计技术，并使用期望函数来确定最佳添加剂组合，以改善处理后土壤的强度特性。通过方差分析(ANOVA)研究了自变量(石灰含量、PET含量和养护时间)对响应[无侧限抗压强度(UCS)和抗弯强度(FS)]的影响。方差分析结果表明，所建立的数学模型具有统计学意义(p≤0.05)，适用于优化过程。从所建立的模型中得到的预测值与实验结果很好地吻合。最佳条件为石灰掺量9%、PET纤维掺量1.9%、养护时间30 D，且具有最大期望函数(D = 0.996)。微观结构研究表明，水合铝酸钙和水合硅酸钙的形成是处理后土壤强度性能提高的关键成分。报告的研究结果涉及石灰和PET纤维的同时应用，以提高残余土的强度特性。

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

Geomechanics and Geoengineering-An International Journal ENGINEERING, GEOLOGICAL-

CiteScore

3.80

自引率

0.00%

发文量

期刊介绍： Geomechanics is concerned with the application of the principle of mechanics to earth-materials (namely geo-material). Geoengineering covers a wide range of engineering disciplines related to geo-materials, such as foundation engineering, slope engineering, tunnelling, rock engineering, engineering geology and geo-environmental engineering. Geomechanics and Geoengineering is a major publication channel for research in the areas of soil and rock mechanics, geotechnical and geological engineering, engineering geology, geo-environmental engineering and all geo-material related engineering and science disciplines. The Journal provides an international forum for the exchange of innovative ideas, especially between researchers in Asia and the rest of the world.