Comparison of the geotechnical properties of crushed shales from Southeastern Nigeria

Okogbue, C. O.; Aghamelu, O. P.

doi:10.1007/s10064-010-0285-z

Cited by 21 publications

(9 citation statements)

References 12 publications

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“…Field compaction results revealed that the relative compaction of 95-100% can be easily achieved in the field using 10-12 ton vibratory rollers. Reference [7] assessed the suitability of Shale for use in construction projects. The results indicate that Abakaliki shale is likely to be satisfactory as a fill and embankment material, although the relatively high liquid limit and plasticity index may result in some swelling of the compacted shale.…”

Section: Literature Reviewmentioning

confidence: 99%

Assessment of the Implications of Geotechnical Properties of Soils in Otukpa Area of Ogbadibo LGA, Benue State, Nigeria

Ameh¹,

Ogbonnaya²,

Lawal³

et al. 2018

JGG

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This study evaluates the index and engineering properties of soils in Otukpa Area of Benue State towards ascertaining their suitability for use as fill and embankment, sub-base and base course material. Otukpa in Benue state Nigeria has vast reserve of sand and other aggregate materials that are presently been mined for various construction purposes. The area holds good potential for human population explosion in the near future. When massive infrastructural development commences, localized sourcing of materials would be necessary. Unfortunately, not much is known of the geotechnical properties of the sands in this area. Index and engineering test was conducted to achieve the aim. Gravel size particles are completely absent. Permeability of soil ranged from 7.8×10 -6 to 3.36×10 -4 m/sec with moisture content of 11.38 to 14.16%. Specific gravity was between 2.63 to 2.67g/cm 3 . UCS range from 31-45Kpa while LL and PL ranged between 27-35% and 10-18% respectively. MDD peak value was 1.85(g/cm 3 ) at an OMC of 12.11% and lowest at 1.67(g/cm 3 ) at an OMC of 11.99. The geotechnical implication of the observed properties range from susceptibility to marginal volume change, differential settlement to low shearing resistance. These materials are quality reserves for fill, embankment and sub-base construction but not for bases.

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Section: Literature Reviewmentioning

confidence: 99%

Assessment of the Implications of Geotechnical Properties of Soils in Otukpa Area of Ogbadibo LGA, Benue State, Nigeria

Ameh¹,

Ogbonnaya²,

Lawal³

et al. 2018

JGG

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“…Yagiz (2001) opined that shale is the most problematic weak rock that causes many problems in the field before and after construction or excavation. Many structures founded on or constructed with shale have either collapsed soon after construction or have been found to be defective or shown signs of failure (Abeyeskera et al 1978;El-Sohby et al 1987;Okogbue and Aghamelu 2010;Iorliam et al 2012bIorliam et al , 2013. Nandi et al (2009) noted that shales are often intensely fractured and weathered and have highly variable geotechnical characteristics, which cause significant construction problems and damage to civil structures each year.…”

Section: Introductionmentioning

confidence: 99%

Strength characteristics of genetically different rice and coconut husk ash compacted shales

Oyediran

Fadamoro

2015

Geo-Engineering

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Background: The strength characteristics of two genetically different shales treated with both Rice Husk Ash (RHA) and Coconut Husk Ash (CHA) was evaluated to elucidate responses and effects, examine effectiveness of the additives with a view to ultimately provide economically viable and environmental friendly options for modification and hence stabilization. Methods: 2 to 20 % by weight of both RHA and CHA were separately added to Okitipupa (SW) and Enugu (SE) shales with the subsequent determination of Plasticity Index (PI), Maximum Dry Density (MDD), Optimum Moisture Content (OMC), Unconfined Compressive Strength (UCS) and California Bearing Ratio (CBR). Results: RHA and CHA were found to possess pozolanic properties such that their addition to shale in modest amounts (not more than 10 % by weight) has beneficial effect on the strength characteristics. Addition of RHA produced shales with reduced PI, higher UCS, increased MDD and more pronounced reduction in OMC when compared with the CHA stabilized shales. However in general, addition of 10 % RHA and 6-10 % CHA brought about optimal effect on the geotechnical properties of shales and as such can be regarded as the optimum content. Conclusions: These materials can thus serve as suitable alternatives to modify and stabilize problematic shale and hence help reduce construction costs, environmental hazards and ultimately bring about shales with improved geotechnical properties.

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“…Enugu Shale is one of these shales that significantly show changes in volume on addition of moisture. Severally studies have identified the characteristics of the Shale (Okagbue and Aghamelu, 2010;Ekeocha, 2015;Oyediran and Fadamoro, 2015; Nwajide and Reijers (1999). Tijani, 2012).…”

Section: Introductionmentioning

confidence: 99%

Estimation of swelling potential of Enugu Shale using cost effective methods

Nnamani¹,

Igwe²

2020

Int. J. Phys. Sci.

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The behavior of swelling soils is mainly governed by its mineralogical composition as well as its environmental factors and stress history. Enugu Shale is one of these shales that assessment of its soil swelling potential cannot only be based on its mineralogical composition alone. The identification of its clay mineral types is basic to understand the roles of other factors of swelling in the soils. The results of particle size distribution indicated that Enugu Shale is dominated by fine-grains with average mean of 69.65, 23.68 sands and 6.67% gravels. While the Atterberg's limit values are moderate to high, with liquid limit ranging from 22-66%, plastic limit 0-39% and plasticity index 0-39%, abundance of major elemental oxides show that SiO 2 (50.4-88.1%), Al 2 O 3 (6.29-28.23%) and Fe 2 O 3 (0.98-12.25%) constitute over 90% of the bulk chemical compositions of the studied area. The studied area is dominated by A-7 soils and low plasticity clay soils according to AASHTO and USCS classification system. The results of free swell ratio range from 1.02-1.45 which indicates that studied area is dominated by mixture of swelling and non-swelling clay minerals. The Van der Merwe's charts shows low to medium swelling potential. These results show that the study area is dominated by low to medium swelling soils which need to be modified and upgraded before it can be used as subgrade material.

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Comparison of the geotechnical properties of crushed shales from Southeastern Nigeria

Cited by 21 publications

References 12 publications

Assessment of the Implications of Geotechnical Properties of Soils in Otukpa Area of Ogbadibo LGA, Benue State, Nigeria

Assessment of the Implications of Geotechnical Properties of Soils in Otukpa Area of Ogbadibo LGA, Benue State, Nigeria

Strength characteristics of genetically different rice and coconut husk ash compacted shales

Estimation of swelling potential of Enugu Shale using cost effective methods

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