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Characterisation of Selected Individually Stabilized Soils for Highway Subbase using Powermax Cement at 6% Maximum


Characterisation of Selected Individually Stabilized Soils for Highway Subbase using Powermax Cement at 6% Maximum
Authors : Isaac Akiije
Publication Date: 06-12-2016

Authors

Author(s):  Isaac Akiije

Published in:   International Journal of Engineering Research & Technology

License:  This work is licensed under a Creative Commons Attribution 4.0 International License.

Website: www.ijert.org

Volume/Issue:   Volume. 5 - Issue. 12 , December - 2016

e-ISSN:   2278-0181

 DOI:  http://dx.doi.org/10.17577/IJERTV5IS120012

Abstract

The purpose of this research work is upon optimising the characteristics of A-1-b(0) stone fragments gravely sandy soil, A-2-7(0) clayey gravely sandy, A-4(3) silty soil and A-5(10) silty soil individually using Powermax Portland cement of grade 42.5N upon their pertinent stabilization for highway subbase. All the materials obtained originated from Southwest part of Nigeria and laboratory experiments employed included the soil classification for highway purposes and their individual cement stabilization tests at 1%, 2%, 3%, 4%, 5% and 6% respectively. Tests carried out included optimum moisture content (OMC), maximum dry density (MDD), California Bearing Ratio (CBR), unconfined compressive strength (UCS) and permeability. The results show that the percent passing sieves 2.0 mm, 0.425 mm and 0.075 mm respectively by grain size analysis of A-1-b(0) are 29%, 13% and 3%; for A-2-7(0) are 85%, 48% and 35%; for A-4(3) are 99%, 71% and 57%; and also for A-5(10) are 92%, 76% and 65%. The results of the coefficient of uniformity and coverture respectively for soil A-1-b(0) are 21 and 3. The results also show that liquid limit, plastic limit and plasticity index respectively for soil A-2-7(0) are 45, 33 and 12; for A-4(3) are 40, 33 and 7; and for A-5(10) are 43, 33 and 10. The OMC of the four soil specimens at natural and at the increasing cement stabilization of same are reducing while the related MDD are increasing. At natural state and for the increasing cement content of the four soil specimens, both unsoaked and soaked CBR, uncured and UCS are increasing while the permeability values are reducing. The chemical composition tests of grades 42.5N Portland cements revealed that C 3 S is 44.82% and C 2 S is 29.95% and these features made the cement normal. The significance of this study is of the four soils experimented upon only the stabilized A-1-a(0) with Powermax cement stabilization attained UCS value of 840 kN/m² at 6% that satisfied the minimum strength requirement of 750 kN/m² for highway subbase. The justification for this study is that the newly produced 42.5N cement economically stabilized A-1-a(0) soil and its use for the other soils experimented upon should be discouraged to prevent premature failure of highway.

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