Evaluation of Conventional and Sustainable Modifiers to Improve the Stiffness Behavior of Weak Sub-Grade Soil

Jaffar, Syed Taseer Abbas; Abid, Malik Muneeb; Khan, Sikander Zaman; Jafri, Turab H.; Rehman, Zia ur; Tariq, Muhammad Atiq Ur Rehman; Ng, A. W. M

doi:10.3390/su14052493

Cited by 9 publications

(7 citation statements)

References 32 publications

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“…In order to investigate the impact of repeated cyclic stress amplitude on the cyclic and post-cyclic behavior in more detail, the repeated cyclic stress amplitudes range from 0.124 kN to 0.25 kN. According to previous studies [42,43], the conclusion that the confining pressures of 50 kPa, 100 kPa, and 150 kPa can represent the actual confining pressures of traffic loading can be achieved. Moreover, in order to investigate the influence law of confining pressure on the cyclic and post-cyclic behavior in more detail, the maximum confining pressure is 300 kPa.…”

Section: Test Procedures and Experimental Schemementioning

confidence: 99%

Cyclic and Post-Cyclic Behaviors of Stabilized Sand-Containing Soft Soil in Coastal Areas

Zhao

et al. 2022

Sustainability

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Land resources are being depleted due to global climate change, and as a result, infrastructures such as expressways and high-speed railways have no option but to be built in soft soil regions. Hence, the cyclic and post-cyclic behaviors of soft soil are vitally important. However, little attention has been devoted to this issue. In the current study, a series of cyclic triaxial tests and standard monotonic loading tests were carried out in order to investigate the cyclic and post-cyclic behavior of stabilized sand-containing soft soil. In addition, the stiffness evolution index model was proposed to describe the characteristics of stiffness evolution. The results show that for a given number of loading cycles, stiffness almost linearly decreases with the increase in sand content. The higher the confining pressure is, the greater the stiffness is. The cement content has the greatest impact on the stiffness evolution index. The stiffness evolution index model can provide a good description of experimental data. The initial value of post-cyclic axial strain is non-zero due to the accumulative strain caused by previous cyclic loading. Post-cyclic stress increases rapidly within a small range of strain and can reach peak stress with great speed. The post-cyclic initial tangent modulus increases from 1602 kPa to 4803 kPa as the cement content increases from 6% to 12%.

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Section: Test Procedures and Experimental Schemementioning

confidence: 99%

Cyclic and Post-Cyclic Behaviors of Stabilized Sand-Containing Soft Soil in Coastal Areas

Zhao

et al. 2022

Sustainability

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“…Furthermore, in order to study the impact of repeated cyclic stress amplitude on the accumulative strain in more detail, the repeated cyclic stress amplitudes used in this paper were 0.124 kN, 0.15 kN, 0.17 kN, 0.19 kN, 0.22 kN, and 0.25 kN. Based on previous studies [38,41,43], a general conclusion that the confining pressures of 50 kPa, 100 kPa, and 150 kPa can represent the actual confining pressures of traffic loading has been accepted. Furthermore, in order to study the impact of confining pressure on the accumulative strain in more detail, the confining pressures used in this paper were 50 kPa, 100 kPa, 150 kPa, 200 kPa, 250 kPa, and 300 kPa.…”

Section: Specimen Preparation and Experimental Schemementioning

confidence: 99%

Accumulative Strain of Sand-Containing Soft Soil Reinforced by Cement and Sodium Silicate under Traffic Loading

Chen

et al. 2022

Sustainability

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The accumulative strain of sand-containing soft soil is crucial to the stability of the construction of embankment engineering such as expressways and high-speed railways. However, little attention has been devoted to the accumulative strain of sand-containing soft soil. In the current study, a series of cyclic triaxial tests were performed to investigate the accumulative strain of sand-containing soft soil reinforced by cement and sodium silicate under traffic loading. In addition, the accumulative strain model was proposed to describe the characteristic of accumulative strain. The results show that for the specimens with a high sand content (25%, 30%, and 35%), the accumulative strain increases obviously with the increase of the sand content. For the specimen with a cement content of 3%, the accumulative strain increases distinctly with the increasing loading time. The accumulative strain is strongly influenced by confining pressure. When the repeated cyclic stress amplitude is greater than 0.17 kN, the increase rate of accumulative strain is greater. The shorter the curing time is, the greater the accumulative strain is. The calculated results of the accumulative strain model show a good agreement with test data. Hence, the accumulative strain model can better describe the characteristic of accumulative strain.

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“…It was revealed that lime can improve the stiffness of the subgrade better than other modifiers. It was also concluded that optimum moisture content increases with an increasing lime percentage and decreases with increasing marble and sand percentages [30].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Resilience Characteristics of Unbound Granular Materials for Sustainable Pavements

et al. 2022

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In this study, a comprehensive laboratory testing program was designed to study the resilience characteristics of unbound granular materials (aggregate base coarse) using the repeated load triaxial test (RLTT). During the experimental program, the resilient modulus of unbound granular material was examined using different moisture content levels, material gradation using Fuller’s equation, and stress levels. The results show that the moisture content, material gradation, and stress level have a major influence on the resilient modulus of unbound granular materials. Furthermore, a linear model has been developed between moisture content and the resilient modulus. The model significantly predicts the change in resilient modulus by changing moisture content. The study also aimed to improve the modified Uzan model by adding the effect of moisture content. An improved modified Uzan stress moisture model has been developed, which shows a strong relationship between the resilient modulus, stress, and moisture content. This study can be used as a benchmark for validating other numerical data.

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Evaluation of Conventional and Sustainable Modifiers to Improve the Stiffness Behavior of Weak Sub-Grade Soil

Cited by 9 publications

References 32 publications

Cyclic and Post-Cyclic Behaviors of Stabilized Sand-Containing Soft Soil in Coastal Areas

Cyclic and Post-Cyclic Behaviors of Stabilized Sand-Containing Soft Soil in Coastal Areas

Accumulative Strain of Sand-Containing Soft Soil Reinforced by Cement and Sodium Silicate under Traffic Loading

Investigation of Resilience Characteristics of Unbound Granular Materials for Sustainable Pavements

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