Mechanical behavior and durability of a typical frictional cohesive soil from Rio Grande do Sul/Brazil improved with Portland cement

Junior, Tennison Freire de Souza; Heineck, Karla Salvagni; Silva, Cezar Falavigna; Rosa, Francisco Dalla

doi:10.1016/j.trgeo.2022.100751

Cited by 3 publications

(2 citation statements)

References 18 publications

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“…Research studies have investigated the mechanical behavior of soil with the purpose of improving its performance and durability, but also for reducing its cost and environmental impact [24][25][26][27][28]. Current findings have indicated the optimal conditions for stabilizing soils, while considering the percentage of addition (waste) and its physicochemical and mineralogical characteristics [29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Effect of Binary Fly Ash-Lime Mixture on the Bearing Capacity of Natural Soils: A Comparison with Two Conventional Stabilizers Lime and Portland Cement

et al. 2023

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This study evaluates a binary mixture of fly ash and lime as a stabilizer for natural soils. A comparative analysis was performed on the effect on the bearing capacity of silty, sandy and clayey soils after the addition of lime and ordinary Portland cement as conventional stabilizers, and a non-conventional product of a binary mixture of fly ash and Ca(OH)2 called FLM. Laboratory tests were carried out to evaluate the effect of additions on the bearing capacity of stabilized soils by unconfined compressive strength (UCS). In addition, a mineralogical analysis to validate the presence of cementitious phases due to chemical reactions with FLM was performed. The highest UCS values were found in the soils that required the highest water demand for compaction. Thus, the silty soil added with FLM reached 10 MPa after 28 days of curing, which was in agreement with the analysis of the FLM pastes, where soil moistures higher than 20% showed the best mechanical characteristics. Furthermore, a 120 m long track was built with stabilized soil to evaluate its structural behavior for 10 months. An increase of 200% in the resilient modulus of the FLM-stabilized soils was identified, and a decrease of up to 50% in the roughness index of the FLM, lime (L) and Ordinary Portland Cement (OPC)-stabilized soils compared to the soil without addition, resulting in more functional surfaces.

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Section: Introductionmentioning

confidence: 99%

Evaluation of the Effect of Binary Fly Ash-Lime Mixture on the Bearing Capacity of Natural Soils: A Comparison with Two Conventional Stabilizers Lime and Portland Cement

et al. 2023

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“…Cohesion is the component of a rock's or soil's shear strength that is unaffected by interparticle friction [1]. In general, shear strength under zero normal stress, or the intersection of a material's failure envelope with the shear stress axis in the shear stress-normal stress space, is referred to as cohesion in soil mechanics [2]. On the other hand, drained cohesion is defined as cohesiveness under saturated drained conditions, while apparent cohesion is defined as cohesion under variably saturated conditions [3].…”

Section: Introductionmentioning

confidence: 99%

Modeling the impact of soil cohesiveness on embankment stability under rapid drawdown

Mkilima

2022

tbus

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For embankment slope stability, soil cohesivity is one of the most important shear strength parameters. The effect of cohesiveness on the slope stability of a homogeneous embankment dam under rapid drawdown loading conditions was examined in this study. With the use of numerical modeling in GeoStudio, different situations were explored based on cohesiveness (0 kN/m2, 5 kN/m2, 10 kN/m2, and 15 kN/m2) under a 1 m per day drawdown rate. The factor of safety value obtained from the long-term steady-state condition under 15 kN/m2 cohesion was equivalent to a 116.8% increase from the one obtained under 0 kN/m2 cohesion. The factor of safety values obtained after subjecting the embankment to different soil cohesion levels yielded a p-value of 1.91 x 10-41, according to the Analysis of Variance. The calculated p-value (alpha value) is less than 0.05, suggesting that the differences between the examined cohesiveness values based on the list of the factor of safety values are statistically significant. The findings derived in this study show that it is significant to capture the effect of material characteristics during the design phase of an embankment dam.

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Study on Properties of Magnesium Oxychloride Cement Solidified Soil

Wang

Zhang²,

Yan

et al. 2022

Advances in Materials Science and Engineering

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Due to the poor performance of ordinary Portland cement (OPC) as a solidified soil road and the large pollution in the production process, environment-friendly magnesium oxychloride cement (MOC) was used as the soil curing agent to prepare the solidified soil, exploring the optimal ratio of various raw materials when MOC is used as a curing agent. Analyzing the properties of MOC solidified soil in the application of road subgrade. This paper tests compaction, mechanical properties, and durability of the MOC solidified soil, simulates the development trend of 7 days unconfined compressive strength of MOC solidified soil, and then analyzes the hydration process and strengthens the formation mechanism of MOC in solidified soil. The study found that the addition of MOC as a curing agent to the soil can effectively improve the compaction and mechanical properties of the soil. Matlab simulation found that when the MgO content is 5.5% to 6% and the ratio of raw materials MgO, MgCl2, and H2O is 2.45 : 1 : 14 to 6.3 : 1 : 14, the performance of MOC solidified soil is excellent. Fitting UCS data, it is found that MOC solidified soil has early strength characteristics. The excellent compaction and mechanical properties of MOC solidified soil are due to the formation of a small amount of phase 5 and layered Mg(OH)2 by the hydration of MOC, and the formation of amorphous gel with SiO2 in the soil. This reaction improves soil compaction and reduces internal porosity from a microscopic perspective. The strength loss rate of MOC solidified soil is higher after immersion in water at the initial stage of curing, but it is still better than that of traditional cement-based solidified soil. Poor performance after immersion in water is associated with disruption of the network-like structure. As an environment-friendly soil curing agent, MOC can be used in engineering practice with low environmental humidity.

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Mechanical behavior and durability of a typical frictional cohesive soil from Rio Grande do Sul/Brazil improved with Portland cement

Cited by 3 publications

References 18 publications

Evaluation of the Effect of Binary Fly Ash-Lime Mixture on the Bearing Capacity of Natural Soils: A Comparison with Two Conventional Stabilizers Lime and Portland Cement

Evaluation of the Effect of Binary Fly Ash-Lime Mixture on the Bearing Capacity of Natural Soils: A Comparison with Two Conventional Stabilizers Lime and Portland Cement

Modeling the impact of soil cohesiveness on embankment stability under rapid drawdown

Study on Properties of Magnesium Oxychloride Cement Solidified Soil

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