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Effect of Organic Matter on Swell and Undrained Shear Strength of Treated Soils
Journal of Civil, Construction and Environmental Engineering
Volume 4, Issue 2, April 2019, Pages: 48-58
Received: May 31, 2019; Accepted: Jul. 1, 2019; Published: Jul. 12, 2019
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Samuel Jonah Abbey, Civil Engineering Cluster, Department of Geography and Environmental Management, Faculty of Engineering and Technology, University of the West of England, Bristol, United Kingdom
Adegoke Omotayo Olubanwo, School of Energy, Construction and Environment, Faculty of Engineering, Environment and Computing, Coventry University, Coventry, United Kingdom
Samson Ngambi, School of Energy, Construction and Environment, Faculty of Engineering, Environment and Computing, Coventry University, Coventry, United Kingdom
Eyo Umo Eyo, School of Energy, Construction and Environment, Faculty of Engineering, Environment and Computing, Coventry University, Coventry, United Kingdom
Blessing Oluwaseun Adeleke, Department of Civil Engineering, Faculty of Engineering, Technology and Science, University of South Wales, Cardiff, United Kingdom
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This paper presents a laboratory and statistical study on swell and undrained shear strength of cemented organic clays blended with eco-friendly (by-product) cementitious materials such as ground granulated blast slag (GGBS) and cement kiln dust (CKD). The presence of organic matter in soils can be very problematic especially during construction of infrastructures such as roads and foundations. Therefore, experimental and statistical investigations are crucial to further understand the effect of organic matter on swell and strength performance of soils treated with by-product materials (GGBS and CKD). Five artificially synthesised organic clays with 0%, 5%, 10%, 15% and 20% organic matters were mixed with 20% cement during the first phase of mixing. In the second phase, cement content was reduced to 4% and blended with 12% GGBS and 4% CKD respectively. All mixed samples were cured up to 56days and subjected to undrained triaxial test and one-dimensional oedometer swell test. The undrained shear strength of the untreated soils decreases from 22.47kPa to 15.6kPa upon increase in organic matter from 0-20%. While the swell increases from 1.17% to 3.83% for the same range of 0-20% organic matter. The results also show improvement on strength and swell upon addition of 20% cement for all investigated samples. For samples treated with 4% cement and inclusion of 12% GGBS and 4% CKD, the treated soils showed better performance in terms of swell potential due to reduction in plasticity compared to the plasticity of soils treated with 20% cement. Undrained shear strength increases from 632kPa to 804.9kPa and from 549.8kPa to 724.4kPa with reduction in organic matter upon addition of 20% CEM and 4% CEM: 12% GGBS: 4% CKD after 56days. The results obtained show that the inclusion of GGBS and CKD reduced swell and increases undrained shear strength irrespective of the percentage of organic materials due to cementation effect. However, results of the statistical studies show that the presence of organic matter influences the extent of performance of the cement, GGBS and CKD treated soils.
Stabilised Soils, Expansive Soils, Organic Matter, Undrained Strength, Swell Capacity, GGBS, Cement, CKD
To cite this article
Samuel Jonah Abbey, Adegoke Omotayo Olubanwo, Samson Ngambi, Eyo Umo Eyo, Blessing Oluwaseun Adeleke, Effect of Organic Matter on Swell and Undrained Shear Strength of Treated Soils, Journal of Civil, Construction and Environmental Engineering. Vol. 4, No. 2, 2019, pp. 48-58. doi: 10.11648/j.jccee.20190402.12
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