Performance Evaluation of Forage Ash Stabilized Shale Soil for Effective Use in Flexible Pavement

For most developing countries, infrastructural development, especially in the road sector, plays a key role in its development, however geotechnical engineers encounter lots of problem during the construction of most roads especially when the subgrades consists of expansive soils due to their swelli...

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Bibliographic Details
Published in:Transportation research procedia (Online) 2020, Vol.48, p.3648-3655
Main Authors: Festus, Fadamoro Oluwafemi, Adewuyi, Oyediran Ibrahim
Format: Article
Language:English
Subjects:
Forage Ash
Pavement Designs
Shale
Soil Stabilization
Unconfined Compressive Strength
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Summary:For most developing countries, infrastructural development, especially in the road sector, plays a key role in its development, however geotechnical engineers encounter lots of problem during the construction of most roads especially when the subgrades consists of expansive soils due to their swelling and shrinkage problems which are responsible for potholes, cracking and undulations in the pavement leading to discomfort and lessening the life of vehicle, hence the engineering properties of these soils needs to be improved. Preliminary tests which include specific gravity, atterberg’s limits test, grain size analysis, compaction tests, California bearing ratio test and unconfined compressive tests were carried out the shale samples, after which 2 to 20% by weight of forage ash was added to the shale sample and subjected to Atterberg’s limits test and some strength tests (Compaction, California Bearing Ratio, and Unconfined Compressive Test). The results show that the addition of forage ash increased the plasticity index of the shale sample, however, the California bearing ratio (CBR) values (soaked and unsoaked) were significantly increased both at the West African level and Modified AASHTO level. The maximum dry density (MDD) of the sample was increased as well as a reduction of the Optimum Moisture Content (OMC) of the sample was found. The values of the unconfined compressive strength show that there was also an increase in the strength of the sample. In conclusion, forage ash was found to be an effective additive for shale soil stabilization and improves the strength of the soil.
ISSN:2352-1465
2352-1465
DOI:10.1016/j.trpro.2020.08.084