Microstructure and shear strength evolution of a lime-treated clay for use in road construction

Rosone, Marco; Celauro, Clara; Ferrari, Alessio

doi:10.1080/10298436.2018.1524144

Cited by 42 publications

(13 citation statements)

References 57 publications

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“…3. This result is consistent with the results obtained by [69], in which the change in shear strength of a particular plasticity clay stabilised by 2% quicklime has been almost steady with curing time, indicating the unsatisfactory amount of chemical stabilisers that are already consumed and the chemical reactions have stopped. Further, the obtained results for 3% cement stabilised specimens by which the UCS of natural soil increased slightly are comparable with the results revealed by [45].…”

Section: Unconfined Compressive Strength (Ucs) and Durabilitysupporting

confidence: 92%

Evaluation of cement stabilised residual soil on macro- and micro-scale for road construction

et al. 2022

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Lateritic soil is a kind of residual soil widespread in tropical countries. This soil usually possesses acceptable engineering properties to be laid under the construction projects. However, it needs treatment for transportation infrastructure such as railway and road subgrade and embankment, particularly when it is in fine-grained form. Thus, cement, one of the very common stabiliser agents in soil stabilisation, was selected to study its influence on lateritic soil at macro- and micro-levels. In order to achieve this goal, UCS, durability, FESEM and EDX tests were conducted. The results obtained indicate that the UCS increase occurs with an increase in cement content and curing time. It was also found that the shear modulus increases with cement content and curing time. The durability test results disclosed that 3% cement is not enough for soil stabilisation when used for projects in the areas subjected to cyclic wetting-drying cycles. The durability test results revealed that the UCS decreased for specimens treated with 6% cement, while on the other hand, the UCS increased for samples treated with 9% and 12% cement. The FESEM results revealed that the soil micro-structure changed with the addition of cement and curing time. The EDX results presented the chemical elements change upon adding cement and increasing curing time. Overall, it was found that cement-stabilised residual soil can be used for road construction. However, the cement percentage needed to stabilise residual soil differs depending on the standards.

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Section: Unconfined Compressive Strength (Ucs) and Durabilitysupporting

confidence: 92%

Evaluation of cement stabilised residual soil on macro- and micro-scale for road construction

et al. 2022

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“…Moreover, the effect of treatment is evident at higher pressures and ABCFS-IHL content by more compact structure due to the closing of macropores on their surface. Totally, treatment of clay with a higher amount of ABCFS-IHL has resulted in an increase in the tensile strength from about 8 to 286kPa after curing process which is due to the activity of the ACBFS with lime in enhancing pozzolanic reactions in the system (Falah et al., 2018; Rosone et al., 2018). The strength development can be described by the effect of ACBFS in hydration and pozzolanic reactions of the lime-treated clay up to 28-days curing periods.…”

Section: Resultsmentioning

confidence: 99%

Effect of Cutter Soil Mixing (CSM) method and curing pressures on the tensile strength of a treated soft clay

Rabbani

Lajevardi

Tolooiyan

et al. 2019

Heliyon

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This study presents a set of laboratory experiments to investigate the effect of Cutter Soil Mixing (CSM) method and curing pressures on the tensile strength of a soft clay treated with Air Cooled Blast Furnace Slag (ACBFS) and Industrial Hydrated Lime (IHL). High productivity, minimum vibration, using the in-situ soil as construction material, and high level of quality control are some of the main benefits of CSM method. Three different slurries containing various percentages of ACBFS and IHL were mixed with saturated soft clay due to CSM method to enhance its tensile strength and make it suitable for the construction of deep CSM panels. To simulate high pressure due to the self-weight of the deep CSM panels in the field, a number of high pressure curing devices were designed and built in the laboratory and used for 28 and 56 day pressurised curing of the treated samples. Then an indirect tensile strength test was performed on the treated samples to investigate the effect of mixing method, ACBFS-IHL content, curing pressure and curing time on the tensile strength of the treated material. Finally, X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) analysis were conducted to investigate the microstructural and properties of the treated clay. The outcomes demonstrate that using CSM method and curing pressures along with ACBFS-IHL as a chemical stabiliser, increases the tensile strength of treated soft clay up to 35 times, which is significantly higher than the use of chemical stabiliser alone. Moreover, the microstructural analysis results revealed that the main hydration products in the clay treated with ACBFS-IHL is gismondine (C–A–S–H) which is also considered to be responsible for the higher tensile development.

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“…Gao et al [31] mainly studied the relationship between hydromechanical behavior and microstructure of soil. Rosone et al [32,33] studied the relationship between mechanical properties and microstructure of lime-treated clay and proved the consistency between microstructure and mechanical properties. Chen et al [34] found that there was a unique linear relation between strength and the void ratio at failure to the reference void ratio.…”

Section: Introductionmentioning

confidence: 97%

The Dependence Between Shear Strength Parameters and Microstructure of Subgrade Soil in Seasonal Permafrost Area

et al. 2020

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Permafrost and seasonal permafrost are widely distributed in China and all over the world. The failure of soil is mainly shear failure, and the strength of soil mainly refers to the shear strength. The two most important parameters of shear strength are cohesion and angle of internal friction. In order to ensure the sustainability of road construction in seasonal permafrost area, the microstructure of subgrade soil was observed and analyzed. First, three subgrade soils with different plasticity indices were prepared for triaxial test and scanning electron microscope (SEM). Then, these specimens underwent freezing–thawing (FT) cycles and were obtained shear strength parameters by triaxial shear test. Next, the microstructure images of soil were obtained by SEM, and the microstructure parameters of soil were extracted by image processing software. Finally, the correlation method was used to analyze the dependence between the shear strength parameters and the microstructure parameters. Results revealed that subgrade soils with a higher plasticity index had higher cohesion and lower angle of internal friction. In addition, with the increase of the number of FT cycles, the diameter and number of soil particles and pores tend to increase, while the roundness, fractal dimension and directional probabilistic entropy of particles decreased. With the increase of the plasticity index, the particle and pore diameter decreased, but the particle and pore number increased. Besides, particle roundness had the greatest influence on the cohesion and angle of internal friction of shear strength parameters.

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Microstructure and shear strength evolution of a lime-treated clay for use in road construction

Cited by 42 publications

References 57 publications

Evaluation of cement stabilised residual soil on macro- and micro-scale for road construction

Evaluation of cement stabilised residual soil on macro- and micro-scale for road construction

Effect of Cutter Soil Mixing (CSM) method and curing pressures on the tensile strength of a treated soft clay

The Dependence Between Shear Strength Parameters and Microstructure of Subgrade Soil in Seasonal Permafrost Area

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