Effect of compaction water content and stress ratio on permanent deformation of a subgrade lateritic soil

Silva, Matheus Francisco da; Ribeiro, M. Marcondes; Furlan, Ana Paula; Fabbri, Glauco Túlio Pessa

doi:10.1016/j.trgeo.2020.100443

Cited by 20 publications

(4 citation statements)

References 19 publications

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“…These procedures are based on the DNIT 179/ 2018 -IE. The analysis of permanent deformation through this test appears in recent studies: Guimarães (2018), Lima et al (2020), Silva et al (2021) and Lima and Motta and Aragão (2021), Bona and Guimarães (2021) and Aragão et al (2019).…”

Section: Bibliographic Reviewmentioning

confidence: 97%

“…Several studies showed low values of permanent deformation in lateritic sandy soils (LA'): those soils studied by Silva et al (2021) resulted in a maximum deformation of 0.22%; seven soils of the same classi$ication tested by Sousa (2021) presented varied permanent deformations, the lowest value being lower than 0.5% and the highest been approximately 3%. Similar results were obtained by Lima (2020) and by Lima et al (2020).…”

Section: Bibliographic Reviewmentioning

confidence: 99%

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Determinação da incerteza de medição nos ensaios de deformação permanente de solos lateríticos

2022

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Durante um processo de análise laboratorial de solos, diversas variáveis influenciam na determinação do parâmetro pretendido. Inerentemente, cada uma das variáveis apresenta incertezas associadas, que podem estar relacionadas a fatores como calibração, leitura de dados, imperícia, etc. Diante do exposto, o presente artigo tem como objetivo determinar a incerteza das medições das deformações permanentes em solos lateríticos. Foram utilizados dados experimentais obtidos de ensaio triaxial de cargas repetidas realizados em areia argilosa do município de Mimoso do Sul, estado do Espírito Santo. A metodologia utilizada engloba as incertezas associadas à tensão confinante ( , à tensão de desvio ( ) e ao número de ciclos (N) , em geral informadas por certificado de calibração. As amostras foram divididas em dois grupos, diferenciados apenas pelo valor de aplicado. Os resultados das medições de dois grupos de ensaio são expressos em forma de intervalo que inclui a incerteza calculada. Como resultado, pode-se observar que a incerteza de medição para o caso proposto não representa variação significativa do resultado para aplicação em pavimentos. Além disso, destaca-se a grande influência da tensão confinante na avaliação desse parâmetro ao comparar os resultados dos dois grupos. Concluiu-se que apresentar a incerteza das medições evidencia a confiabilidade e qualidade dos resultados.

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Section: Bibliographic Reviewmentioning

confidence: 97%

Section: Bibliographic Reviewmentioning

confidence: 99%

Determinação da incerteza de medição nos ensaios de deformação permanente de solos lateríticos

2022

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“…The material becomes less sensitive to water with the decrease of the content of fines which resulted from the addition of crushed granite. This is very important because most of the degradation of the roads is due to the combined effect of water sensitivity and traffic [41,42]. This decrease of sensitivity to water with the addition of granite is very interesting to explore in the future studies, given that the properties of lateritic material are largely influenced by the water content.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Geotechnical and Mechanical Characterization of Lateritic Soil Improved with Crushed Granite

et al. 2022

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Since many years, road infrastructures in West Africa are most often subject to premature degradations despite the large number of studies. This problem is often due to the poor control of the behaviour of materials used for the pavement, but also to the scarcity of good quality materials. Nowadays, with economic development, there is a necessity for road infrastructures of good quality. In this framework, the main objective was to study the vertical geotechnical variability of the gravelly lateritic soil from the Saaba site in Burkina Faso and to improve their performances by adding crushed granite. The results show that the physical properties of the soils are almost identical depending on the depth. However, a small difference in the mechanical properties was observed. Due to their poor characteristics, these materials cannot be used for the sub-base layer according to the pavement design guide for tropical countries, CEBTP [1]. In order to improve their geotechnical and mechanical characteristics, crushed granite of class 0/31.5 mm was added at different percentages: 20, 25, 30, and 35%. It appears that the plasticity index, the methylene blue value, as well as the optimal water content of the material decreased. The soaked CBR recorded a maximum relative increase of 164% (from 14 to 37%) with the addition of 20 to 30% of crushed granite. With the addition of 20 to 30% of crushed granite, Young's modulus and unconfined compressive strength also showed a clear increase of 309% (from 80 to 327 MPa) and 140% (from 0.72 to 1.73 MPa). By comparing the results with the CEBTP specifications, the addition of 30% of granites at 95% compactness allows the materials to have a CBR that exceeds the value of 30% and can be used in the sub-base layer of road pavement. The addition of 30% granite allows the materials to record an unconfined compressive strength higher than 0.5-1.5 MPa, which corresponds to lateritic soil suitable for sub-base layer according to Messou [2]. After the addition of 30% granite, the materials record a Young's modulus greater than 300 MPa and can be used as a base layer. The assessment of the improvement of mechanical performance simultaneously based on the CBR, the Young's modulus, and the compressive strength showed the contradictory evolution of the results from these different parameters. A discussion was made on the relationship between these parameters. Doi: 10.28991/CEJ-2022-08-05-01 Full Text: PDF

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“…Due to the special engineering properties of laterite, such as high void ratio, high water content, hard top and soft bottom, loss of water shrinkage, and cracking [7][8][9][10][11][12][13], it is easy to induce insufficient foundation bearing capacity, ground collapse, slope cracking, uneven settlement, and other project problems [14][15][16][17]. In addition to the disturbance of the stratum developed by the laterite, the unique mechanical properties of the laterite seriously threaten the safety of engineering construction and bring a lot of inconvenience to the construction process [18][19][20][21][22]. Consequently, it has important research significance to improve the properties of laterite.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Microscopic Properties of Graphite/Laterite Nanocomposites

Gao

Zhang³

et al. 2021

Advances in Materials Science and Engineering

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The effectiveness and improvement mechanism of graphite nanoparticles (GN) in strength properties and microstructure characteristics of regional laterite were analysed in this study. Dry density was also taken into consideration, and the effects of graphite nanoparticle (GN) content and dry density were mainly addressed. Triaxial tests, consolidation tests, and penetration tests were used to analyse the effectiveness of different dry densities and graphite nanoparticle mass ratios on the properties of laterite; microscopic methods such as scanning electron microscopy (SEM) tests were used to analyse the improvement mechanism. The results show that the increase in dry density can make the laterite more compact. The large specific surface area and nanoeffects of the graphite nanoparticles (GN) induce the attraction between soil particles after mixing, both of which make the laterite’s shear strength; compression index and impermeability have been enhanced to varying degrees. The microscopic tests showed that, as the content of graphite nanoparticles (GN) continues to increase, when it exceeds 1.0%, the attraction between soil particles increases and coarse particles are formed, which leads to the increase of the pores of the soil. In addition, the graphite nanoparticles have a certain degree of lubricity, a high amount of graphite nanoparticles enters the laterite soil layer, increasing the distance and gap between the layers, making it easy to separate the coarse particles from the coarse particles, and the strength increase is reduced. However, it is still stronger than that of the plain laterite.

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Effect of compaction water content and stress ratio on permanent deformation of a subgrade lateritic soil

Cited by 20 publications

References 19 publications

Determinação da incerteza de medição nos ensaios de deformação permanente de solos lateríticos

Determinação da incerteza de medição nos ensaios de deformação permanente de solos lateríticos

Geotechnical and Mechanical Characterization of Lateritic Soil Improved with Crushed Granite

Mechanical and Microscopic Properties of Graphite/Laterite Nanocomposites

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