The influence of parent rock factor on some engineering index properties of three residual lateritic soils in Southwestern Nigeria

Adeyemi, G. O.

doi:10.1007/bf02602677

Cited by 22 publications

(18 citation statements)

References 3 publications

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“…According to Ola [30] who related plasticity index to swelling potential ( Table 4), 25% of the soils possess low swelling potential, 25% of the soils possess medium swelling potential, and 50% of the soils possess high swelling potential. This result is consistent with Adeyemi [26] who noted that a great majority of samples of migmatite-gneiss-derived soil have high plasticity.…”

Section: Plasticity Characteristicssupporting

confidence: 92%

“…Texturally, the migmatite-gneisses are medium-to coarse-grained rock with light gray varying to pinkish rocks [25]. The differences in textural and mineralogical characteristics of parent rocks could be responsible for significant differences in the engineering properties of the derived soils [26]. Therefore, parent rock factor is expected to have some significant influence on the engineering properties of laterite soils [27].…”

Section: Geological Setting and Test Methodsmentioning

confidence: 99%

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Evaluation of plasticity and consolidation characteristics of migmatite–gneiss-derived laterite soils

2019

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Information on plasticity and consolidation characteristics of soil materials have been found to be profoundly important for preliminary structural planning and designs since these properties influence soils' compressibility and settlement characteristics and, by extension, the performance of any engineering structure on the soils. The dependency or relationship of consolidation characteristics with plasticity characteristics of remolded migmatite-gneiss-derived laterite soils from southwestern Nigeria was statistically evaluated. A total of eight (8) bulk disturbed soil samples were subjected to Atterberg limits tests and one-dimensional consolidation tests following British Standard BS 1377 methods. Further, the results obtained were subjected to regression analysis. The plasticity index (PI), linear shrinkage, and shrinkage index values ranged from 8.0 to 33.65, 4.3 to 10.7, and 19.0 to 50.2, respectively. The average coefficient of consolidation (C v ) and compression index (C c ) values ranged from 0.02184 to 0.03290 mm 2 /min and 0.0203 to 0.0812, respectively. The correlation coefficient of compression index values with plasticity index and shrinkage index values is 0.90 and 0.72, respectively. The coefficient of correlation (r) of the relationship between consolidation coefficient values and consolidation pressure (AP) values of 20-160 kPa (loading session only) is 0.97. The coefficients of correlation (r) of average consolidation coefficient values with linear shrinkage, shrinkage index, and plasticity index values are 0.60, 0.73, and 0.88, respectively. Hence, coefficient of consolidation and compression index have better correlations with plasticity index over shrinkage index and linear shrinkage. Further, the correlation coefficient of plasticity Index (PI) with all the consolidation coefficient values, derived at each stage of effective vertical consolidation pressures (AP) of 20-160 kPa (loading and unloading), is 0.79. Based on these results, correlation equations for predicting consolidation coefficient and compression index were proposed. This evaluation has aided better understanding of the relationship between consolidation and plasticity characteristics of migmatite-gneiss-derived laterite soils and can be applied to several other basement terrains.

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Section: Plasticity Characteristicssupporting

confidence: 92%

Section: Geological Setting and Test Methodsmentioning

confidence: 99%

Evaluation of plasticity and consolidation characteristics of migmatite–gneiss-derived laterite soils

2019

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“…However, it can be inferred from the comparatively lower I P for Lam-Lam sample that the soils occurring in this quarry may gain more strength from the capillary tension of the water meniscus around their contact areas leading to possible increase in effective strength upon the grains and thus the frictional resistance at the points of contact. According to Adeyemi (1995), excessively high plasticity often leads to a common type of road failure in the tropics called «waviness» -a failure which results from plastic flow of wet soil on the application of traffic load. The plots of the Atterberg limits of the tested samples fraction (∅ < 400µm) in the Casagrande plasticity chart, revealed that the lateritic soils can be classed as « low to medium plastic » inorganic clays and silts materials.…”

Section: Resultsmentioning

confidence: 99%

On the Geotechnical Properties of Lateritic Gravels from the Quarries of Lam-Lam and Mont-Rolland (Western Senegal) – Implications for Their Use in Road Construction

Diop¹,

Gbaguidi²,

Diome

et al. 2015

IJSTS

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Samples of laterite soils from the quarries of Lam-Lam and Mont-Rolland (Thiès Department/Western Senegal) were investigated in the laboratory following the standard procedures suggested by the French norms. The main objective was directed at evaluating the geotechnical properties and the suitability for use as aggregates in road construction. The investigation revealed low load-bearing capacity (CBR of 61-65) as the primary technical parameter that constrained their suitability in road structure based on the general technical specifications. The bulk material meets the requirement for use as aggregates in road sub-grades, but does not fulfill the criteria for use as sub-bases in road construction; thus there is the need for necessary pretreatment in order to enhance their mechanical performance. The observed low bearing capacity can be attributed to the relative abundance of fines particles which tends to decrease the mechanical resistance and performance of aggregates, particularly in wet conditions.

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“…Atterberg limits estimates the strength and settlement characteristics of soils for road construction [57,58]. The liquid limit, plastic limit and plasticity index results of the soils ranged from 24.0-61.1%, 19.2-26.2% to 4.35-38.90%, respectively.…”

Section: Index Propertiesmentioning

confidence: 99%

Engineering properties of residual soils in part of Southwestern Nigeria: implication for road foundation

2019

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The impact of roads on the socioeconomic development and progress of any country cannot be quantified. A geotechnical investigation of subsoils along Isinbode-Ara road, stretching in southeastern to northwestern direction of 7 km distance within Ekiti State, Southwestern Nigeria, was carried out. This investigation follows the British Standard Institution, such as moisture content, particle size distribution, specific gravity, Atterberg limit, compaction, consolidation and California bearing ratio. Results of investigation showed that the moisture content, specific gravity, liquid limit, plastic limits and plasticity index ranged from 7.2-25.9%; 2.64-2.77; 24.0-61.1%; 19.2-26.2% to 4.35-38.90%, respectively. Grain size distribution showed the fine and coarser fractions range from 13.0-66.5% to 32.6-84.8%, respectively. The maximum dry density and its optimum moisture content ranged from 1.48-2.07 g/cm 3 to 11.3-30.3%, respectively. Soaked CBR results ranged from 3 to 44%. Two classes of subsoils, namely A-2-4 and A-2-6 (granular materials) and A-6 and A-7-6 (clayey soils), were identified and rendered suitable and unsuitable road construction materials, respectively. This investigation revealed that the subsoils are poor road construction materials due to its fine fractions and plasticities, which should be put into consideration during its foundation design and construction stages.

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The influence of parent rock factor on some engineering index properties of three residual lateritic soils in Southwestern Nigeria

Cited by 22 publications

References 3 publications

Evaluation of plasticity and consolidation characteristics of migmatite–gneiss-derived laterite soils

Evaluation of plasticity and consolidation characteristics of migmatite–gneiss-derived laterite soils

On the Geotechnical Properties of Lateritic Gravels from the Quarries of Lam-Lam and Mont-Rolland (Western Senegal) – Implications for Their Use in Road Construction

Engineering properties of residual soils in part of Southwestern Nigeria: implication for road foundation

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