Prediction of the resilient modulus of two tropical subgrade soils considering unsaturated conditions

Freitas, Jeferson Barbosa de; Rezende, Lilian Ribeiro de; Gitirana, Gilson de F. N.

doi:10.1016/j.enggeo.2020.105580

Cited by 25 publications

(9 citation statements)

References 46 publications

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“…Furthermore, the engineering properties of laterite and other tropical residual soils are subject to routine modifications as a result of the permanent alteration of their mineralogical characteristics under varying moisture conditions [19]. Hence, their susceptibility to changes under high temperature and moisture conditions, especially in wet tropical regions, limits their utilisation as suitable materials for earthworks construction [1,17,[20][21][22]. Therefore, the stabilisation of lateritic soils with suitable additives is crucial to increasing the long-term stability of highway pavements, earth dams, and road embankments.…”

Section: Introductionmentioning

confidence: 99%

Appropriate Use of Lime in the Study of the Physicochemical Behaviour of Stabilised Lateritic Soil under Continuous Water Ingress

et al. 2020

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Lime stabilisation is one of the traditional methods of improving the engineering properties of lateritic soils for use as subgrade and foundation materials for the construction of road pavements and highway embankments. Understanding the mechanical performance of lime-stabilised lateritic subgrades in terms of their durability under continuous water ingress will improve environmental sustainability by conserving scarce natural resources and reducing the environmental impacts of repair and replacement of pavements. However, there are several conflicting reports on the durability of lime-stabilised soils subjected to continuous water ingress and harsh environmental conditions. Therefore, this paper evaluates the influence of leaching on the physicochemical behaviour and durability of lime-stabilised lateritic soil under continuous water ingress, simulating the typical experience in a tropical environment. Variations in the strength and durability of the lateritic soil at various lime contents (0, 2.5, 5, 7.5, 10, 15, and 20 wt.%) and soaking periods (3, 7, 14 and 28 days) were evaluated by performing the California bearing ratio tests before and after subjecting the lime-lateritic soil (LLS) samples to continuous leaching using two modified leaching cells. Furthermore, physicochemical analysis was performed to assess the variation of cation concentrations and changes in the physical properties of the pore fluid as the leaching time progressed from 3 to 28 days. The results show that the minimum strength reduction index of the soil corresponds to its lime stabilisation optimum (LSO). Electrical conductivity decreased monotonically and almost uniformly with an increase in leaching time, irrespective of lime content. So, too, was calcium concentration and to a lesser degree for pH and potassium concentration. Adverse changes in the physicochemical behaviour of the LLS samples occurred at lime contents below and slightly above the optimum lime content of the soil. Whereas permanent pozzolanic reactions occurred at lime contents above the LSO and thus resulted in a 45-fold increase in strength and durability. The results are significant for reducing the detrimental effect of the leaching-induced deterioration of flexible pavements founded on tropical floodplains.

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Section: Introductionmentioning

confidence: 99%

Appropriate Use of Lime in the Study of the Physicochemical Behaviour of Stabilised Lateritic Soil under Continuous Water Ingress

et al. 2020

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“…MR value can either be estimated directly from laboratory testing or indirectly using several empirical models suggested by some researchers [52,53]. Due to the complexity and time consuming of the direct determination of MR, this value is usually predicted by using some empirical models suggested by some researchers [54,55]. In the present study, an attempt was made to investigate the effect of WMD on the MR of the soil-binder specimens.…”

Section: Methodsmentioning

confidence: 99%

Performance of Using Waste Marble Dust for the Improvement of Loose Sand in Deep Soil Mixing

Alnunu

Nalbantoğlu

2021

Arab J Sci Eng

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The use of waste materials in soil stabilization is very important in terms of recycling of waste materials and reducing environmental pollution. The aim of this study is to investigate the effective use of waste marble dust, WMD in deep soil mixing, which is one of the ground improvement techniques used for problematic soils. In this study, loose sand was mixed with cement and different proportions of WMD. First, soil-binder mixtures were formed by using cement as a binder material and then cement was replaced by different percentages of WMD. Series of tests were performed to evaluate the effect of WMD on the mechanical properties of the mixtures, such as unconfined compressive strength, stress-strain behavior, toughness, modulus of elasticity and resilient modulus. Ultrasonic pulse velocity (UPV) test was also carried out on the specimens. The specimens were also examined under a microscope to investigate the pore spaces and surface bonds. In addition, setting time and bulk density of the specimens were studied. The optimum replacement percentage of WMD was found to be (10) at a binder-soil ratio of (20). Reuse of WMD in deep soil mixing is promising and will provide significant cost saving and environmental protection.

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“…It is observed that the values of the back analyzed modules (1928, 586 and 271 MPa for base, subbase and subgrade, respectively) were higher than those found in the laboratory. One of the hypotheses for this difference is that the humidity below the optimum used in the %ield may have resulted in increased soil suction, which, according to Santos (2019) and Freitas, Rezende and Gitirana Jr. (2020), would generate an increase in RM. The error values obtained by BackMeDiNa were lower than those of BAKFAA, and BackMeDiNa was able to better adjust the measured curve regardless of its shape.…”

Section: Structural Analysismentioning

confidence: 99%

Mechanistic evaluation of a monitored pavement constructed with asphalt surface treatment

Santos

Rezende

2020

TRANSPORTES

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Este artigo objetiva apresentar os resultados preliminares de um trecho monitorados em Goiás, incorporando análises mecanicistas de modo a contribuir com o banco de dados de materiais, tecnologias e desempenho de um pavimento asfáltico executado com Tratamento Superficial Duplo (TSD). Para isso, nesta pesquisa foram realizados ensaios laboratoriais com os materiais em termos de caracterização, comportamento mecânico e resiliente dos componentes de cada camada, verificando também o comportamento do cascalho melhorado com cimento em três teores diferentes. A seção de teste do pavimento foi monitorada durante a execução e até 6 meses após liberação do tráfego, por meio da determinação das deflexões, das macro e microtexturas, da medida da trilha de roda, da avaliação do tráfego e da identificação dos defeitos aparentes. O dimensionamento do TSD também foi avaliado. As tensões e deformações desenvolvidas ao longo das camadas foram obtidas e os módulos de campo determinados por meio de retroanálise. Os resultados mostraram ganho de desempenho mecânico com a adição de cimento no cascalho, falhas na execução, surgimento precoce de patologias, elevadas deformações nas camadas inferiores à base e superdimensionamento de emulsão no TSD.

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Prediction of the resilient modulus of two tropical subgrade soils considering unsaturated conditions

Cited by 25 publications

References 46 publications

Appropriate Use of Lime in the Study of the Physicochemical Behaviour of Stabilised Lateritic Soil under Continuous Water Ingress

Appropriate Use of Lime in the Study of the Physicochemical Behaviour of Stabilised Lateritic Soil under Continuous Water Ingress

Performance of Using Waste Marble Dust for the Improvement of Loose Sand in Deep Soil Mixing

Mechanistic evaluation of a monitored pavement constructed with asphalt surface treatment

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