Compressibility and microstructure of compacted laterites

Otálvaro, Iván Fernando; Neto, Manoel Porfírio Cordão; Caicedo, Bernardo

doi:10.1016/j.trgeo.2015.09.005

Cited by 35 publications

(18 citation statements)

References 21 publications

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“…5). This difference is caused by the higher water content, which differentiates the soil microstructure (Otálvaro et al, 2015). This behavior corroborates the assertion that moisture content is the factor that most influences velocity Teixeira et al, 2015).…”

Section: Nondestructive Testingsupporting

confidence: 85%

“…Although these specimens lost moisture to the environment during the same period (120 days), the variations in compaction moisture caused differences in the microstructure. The ultrasonic testing identified this microstructural difference, which is more significant when moisture is above the optimum (Andrianatrehina et al, 2018;Otálvaro et al, 2015;Romero, 2013).…”

Section: Nondestructive Testingmentioning

confidence: 92%

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Soil Elastic Modulus Determined by Ultrasound Tests

Sarro¹,

Ferreira²

2019

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The elastic constants obtained through conventional destructive (triaxial and resilience) tests can present great variability, even for soils with the same classification. Thus, a test is necessary to determine the elastic constants of soils in a reliable and replicable way. The ultrasonic technique is used to characterize rock and several construction materials (wood, cementitious matrices, metals), including the elastic parameters (elastic modulus, shear modulus, and Poisson's ratio). The aim of this study was to verify the correlation between the elastic modulus obtained through ultrasonic testing and through a simple unconfined compression test on compacted clayey soil. Test specimens were molded at normal compression energy with three moisture contents; the specimens were exposed to air and packed with plastic wrap for 120 days. After this period, we performed ultrasonic and compression tests. The technique presented great potential to study the mechanical behavior, with correlation coefficients over 0.97 for both parameters (compressive strength and static elastic modulus). We also verified that the ultrasonic testing is influenced mainly by the moisture content.

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Section: Nondestructive Testingsupporting

confidence: 85%

Section: Nondestructive Testingmentioning

confidence: 92%

Soil Elastic Modulus Determined by Ultrasound Tests

Sarro¹,

Ferreira²

2019

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“…Macropore space decreases as the water content or the compaction energy increases, whereas the micropore space remains unaltered by compaction. Comparing the behaviour of saturated soils under oedometric compression, it is possible to conclude that the aggregates remain even at high stresses (Otálvaro et al, 2015). According to Alonso et al (2013), if water accesses to an initially compacted dry soil, the microstructure will saturate first, because of the strong affinity between water and clay platelets.…”

Section: Introductionmentioning

confidence: 99%

One-dimensional compression and swelling of compacted fly ash

Zabielska-Adamska

2018

Geotechnical Research

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The aim of the paper is to prove that the compressibility and swelling of compacted fly ash in both unsaturated and fully saturated conditions are dependent on the moisture content at the compaction and on the compaction energy, as in the case of cohesive soils. The studies have been conducted on samples compacted at various water contents in conventional oedometers and the Rowe hydraulic consolidation cell and in California bearing ratio moulds (swelling tests). The one-dimensional compressibility of saturated fly ash is much higher than that of unsaturated fly ash. Deformation of unsaturated samples increases with moisture at compaction, and the samples compacted with greater effort are less compressible. The consolidation of the saturated samples decreases with their moisture content at compaction and at the reduction of the compaction energy. The swelling of ash samples decreases as the moisture during compaction increases and when compaction energy is lower. The highest swelling was obtained for the fly ash with the highest optimum water content.

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“…Trzcinski et al [22] quantitatively analyzed the microstructure parameters of different soil samples and proved that engineering parameters could be predicted according to soil microstructure types and pore space parameters. With the further upgrading of technology and analysis methods, researchers [23][24][25][26][27][28][29][30] have studied different aspects of different soils and achieved some results. However, the relationship between microstructure and mechanical properties has rarely been studied in previous studies.…”

Section: Introductionmentioning

confidence: 99%

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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Compressibility and microstructure of compacted laterites

Cited by 35 publications

References 21 publications

Soil Elastic Modulus Determined by Ultrasound Tests

Soil Elastic Modulus Determined by Ultrasound Tests

One-dimensional compression and swelling of compacted fly ash

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

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