Basic index properties, mineralogy and microstructure of an amphibolite derived laterite soil

Ogunsanwo, Olufemi

doi:10.1007/bf02594701

Cited by 9 publications

(7 citation statements)

References 4 publications

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“…These values are typical for lateritic soils. For instance, Ogunsanwo (1986) obtained a loss on ignition value of 10.55% for an amphibolite derived laterite soil. Loss on ignition values ranging from 4.2 to 10.5% were obtained for various laterite soils from southwestern Nigeria (Ogunsanwo, 1988).…”

Section: Properties Of Ironstone Lateritic Gravelsmentioning

confidence: 98%

Properties of Ironstone Lateritic Gravels in Relation to Gravel Road Pavement Construction

Nwaiwu

Alkali

Ahmed³

2006

Geotech Geol Eng

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A laboratory investigation was conducted to determine properties of five samples of 'oolitic ironstone' lateritic gravel aggregates which are relevant to their use as road construction materials. Measured values of physico-chemical, physico-mechanical as well as index properties and compaction characteristics are similar to those of other lateritic, gravels occurring in West Africa which are used in road pavement applications. These lateritic clayey gravels have good workability as engineering construction materials and are rated fair to good as road aggregates in terms of probable in-situ behaviour based on water absorption values. Relationships between maximum dry unit weight and optimum moisture content as well as those between California bearing ratio and some derived soil parameters such as grading modulus, plasticity product or plasticity modulus can be described using a third-order polynomial function. The maximum dry unit weight has a bimodal frequency distribution and can be predicted from logarithm to base 10 of compaction energy with fairly good accuracy.

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Section: Properties Of Ironstone Lateritic Gravelsmentioning

confidence: 98%

Properties of Ironstone Lateritic Gravels in Relation to Gravel Road Pavement Construction

Nwaiwu

Alkali

Ahmed³

2006

Geotech Geol Eng

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“…as reported by (Badmus, 2010;Ogunsanwo, 1986;Osinubi and Nwaiwu, 2006;Oyediran and Okosun, 2013) are inactive or normal clays. The classification of the lateritic soils using Polidori's activity chart is shown in Figure 6 and Table 2.…”

Section: Activity Of the Lateritic Soilsmentioning

confidence: 55%

“…Almost all soils have high sand and silt fractions (over 50 % combined). Although, the particle size distributions of lateritic soils presented by Ogunsanwo (1986) have a high percentage of clay fractions compared with the combined sand and silt fractions.…”

Section: Comparison Between Polidori and Casagrande Charts Of The Lateritic Soilsmentioning

confidence: 92%

“…Laterite and lateritic soils, an example of tropical residual soils, may have different engineering and index characteristics depending on the mineralogy of the parent rock, weathering intensity, rainfall, and temperature. These properties vary with spatial location as well as depth ( Adeyemi and Wahab, 2008 ; Ogunsanwo, 1986 ). Studies have also shown that field behavior/performance of lateritic soils with similar plasticity characteristics could vary significantly ( Adeyemi and Oyeyemi, 2000 ).…”

Section: Introductionmentioning

confidence: 99%

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The use of Polidori's plasticity and activity charts in classifying some residual lateritic soils from Nigeria

Afolagboye

Talabi

Owoyemi

2021

Heliyon

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Over the years, Casagrande plasticity chart is mainly used to classify fine grain soils. However, the use of the plasticity chart has been questioned recently and this has led to the development of a new plasticity chart. Polidori in 2007 and 2009, respectively, developed the new plasticity and activity charts using the Atterberg's limits of pure clays (montmorillonite and kaolinite clay minerals) and their mixture with fine silica sand in different proportions. The applicability of Polidori's charts was evaluated using some residual lateritic soils from Nigeria. On the Casagrande's plasticity chart, the lateritic soils mostly plot above the A-line in the zone designated as clay and classified as either CL or CH. However, on the Polidori's plasticity chart, the lateritic soils classified as CL or CH, whereas on Casagrande's plasticity chart they are classified as ML or MH and vice versa. The classifications obtained from Polidori's plasticity chart are predominantly in agreement with the main soil fractions or component of the soils. This is different from the classification obtained from Casagrande's plasticity chart where lateritic soils with lower clay fractions than their silt/sand fractions are classified as clayey soils. Polidori's activity chart shows that lateritic soils that lie in the same plastic zone may show different behavior due to the different properties of the clay minerals in the soils. In cases where the lateritic soils lie in the zone that is not corresponding to their clay contents on the Polidori's plasticity chart, we presume that other factors apart from those stated by Polidori might also be responsible. Although the use of Polidori's plasticity chart gives a fair classification of the lateritic soils, nevertheless the peculiarity of residual soils such as the in situ structure that influenced the properties of the soils and properties developed due to weathering effects must be taken into consideration as well.

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“…Numerous studies have been made on the engineering properties and behaviour of laterite soils [2][3][4][5][6]. Several previous studies on laterite soils by Gidigasu [7] for Ghanaian soils, Malomo [8] for Brazilian soils, and Madu [9], Ola [10][11][12], and Ogunsanwo [13,14], Malomo [15], Mesida [16] for Nigerian soils have demonstrated the susceptibility of laterite soils to degradation under load. Their soil grains, which are derived from the cementation of smaller ones, break down to smaller sizes on application of load.…”

Section: Introductionmentioning

confidence: 99%

Predictive Shear Strength Models for Tropical Lateritic Soils

Ojuri

2013

Journal of Engineering

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This research focused on the indirect determination of soil shear strength using basic soil properties for a lateritic soil area. Samples were collected from six different locations in the Federal University of Technology Akure, Ondo State, Nigeria. These lateritic soils fall within the A-2, A-6, and A-7 groups in the AASHTO classification system. Exploratory analysis of the six independent variables was performed using the statistical analysis of principal components. The stepwise multiple regression was used to establish the best predictive models for the California bearing ratio (CBR) and undrained shear strength (). A remarkable significant model for undrained shear strength [ = −547.713 + 0.381MDD − 9.104GI] with (2,3 = 229.476, < 0.005, Adjusted 2 = 0.989, Std. Error = 7.5638) emerged. This model accounts for 99.4% of variation in the dependent variable. For the included predictor variables beta = 0.722, < 0.005 and beta = −0.417, < 0.005 for MDD and GI, respectively, where other variables are excluded from the model. This makes a quick evaluation of the shear strength of lateritic soils by using their maximum dry density and group index values possible.

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Basic index properties, mineralogy and microstructure of an amphibolite derived laterite soil

Cited by 9 publications

References 4 publications

Properties of Ironstone Lateritic Gravels in Relation to Gravel Road Pavement Construction

Properties of Ironstone Lateritic Gravels in Relation to Gravel Road Pavement Construction

The use of Polidori's plasticity and activity charts in classifying some residual lateritic soils from Nigeria

Predictive Shear Strength Models for Tropical Lateritic Soils

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