Compressive and Tensile Strength of Nano-clay Stabilised Soil Subjected to Repeated Freeze–Thaw Cycles

IF 0.7 Q4 MECHANICS Studia Geotechnica et Mechanica Pub Date : 2023-09-01 DOI:10.2478/sgem-2023-0009
M. Roustaei, Mahdi Sabetraftar, E. Taherabadi, M. Bayat
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Abstract

Abstract Improvement of the mechanical properties of clayey soils by additional elements to enhance the strength under numerous freezing and thawing cycles has been considered as a serious concern for engineering applications in cold regions. The objective of the current study is to investigate the effect of nano-clay as a stabiliser on the mechanical properties of clay. To this end, the clay specimens were prepared by adding various percentages of nano-clay ranging from 0.5% to 3% by dry weight of soil and were experimentally tested under the uniaxial compression and tensile splitting tests under different curing times (0, 7 and 28 days) after experiencing various freeze–thaw cycles ranging from 0 to 11. It can be concluded from the results that nano-clay particles may be used as a stabiliser in geotechnical applications to improve soil property. The results indicate that the optimum moisture content (OMC) of specimens increases and the maximum dry density (MDD) decreases with the increasing nano-clay content. The specimens containing about 1% nano-clay recorded maximum values of unconfined compressive strength (UCS) as well as tensile strength. For example, the addition 1% nano-clay increased the UCS and tensile values of clay specimens under the curing time of 28 days by 34% and 247%, respectively. In addition, the long-term durability of specimens against freeze–thaw cycles increases further with the addition of nano-clay content ranging from 2% to 3%.
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反复冻融循环作用下纳米粘土稳定土的抗压和抗拉强度
利用附加元素改善粘性土的力学特性,提高其在多次冻融循环下的强度,已成为寒冷地区工程应用的一个重要问题。本研究的目的是研究纳米粘土作为稳定剂对粘土力学性能的影响。为此,在土壤干重的0.5% ~ 3%范围内添加不同比例的纳米粘土制备粘土试件,并在0 ~ 11次冻融循环后,进行不同养护时间(0、7、28天)的单轴压缩和拉伸劈裂试验。研究结果表明,纳米粘土颗粒可作为稳定剂应用于岩土工程中,以改善土壤的性质。结果表明:随着纳米粘土含量的增加,试样的最佳含水率(OMC)增大,最大干密度(MDD)减小;当纳米粘土含量约为1%时,试件的无侧限抗压强度和抗拉强度均达到最大值。例如,添加1%的纳米粘土可使粘土试件在28 d养护下的单抗强度和拉伸值分别提高34%和247%。此外,当纳米粘土含量在2% ~ 3%之间时,试件抗冻融循环的长期耐久性进一步提高。
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来源期刊
CiteScore
1.30
自引率
16.70%
发文量
20
审稿时长
16 weeks
期刊介绍: An international journal ‘Studia Geotechnica et Mechanica’ covers new developments in the broad areas of geomechanics as well as structural mechanics. The journal welcomes contributions dealing with original theoretical, numerical as well as experimental work. The following topics are of special interest: Constitutive relations for geomaterials (soils, rocks, concrete, etc.) Modeling of mechanical behaviour of heterogeneous materials at different scales Analysis of coupled thermo-hydro-chemo-mechanical problems Modeling of instabilities and localized deformation Experimental investigations of material properties at different scales Numerical algorithms: formulation and performance Application of numerical techniques to analysis of problems involving foundations, underground structures, slopes and embankment Risk and reliability analysis Analysis of concrete and masonry structures Modeling of case histories
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