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Influence of Plastic Fines on Compaction and CBR Characteristics of Soil Mixtures


Influence of Plastic Fines on Compaction and CBR Characteristics of Soil Mixtures
Authors : Dr. M. V. S Sreedhar, Zainab Fatima
Publication Date: 17-07-2017

Authors

Author(s):  Dr. M. V. S Sreedhar, Zainab Fatima

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. 6 - Issue. 07 , July - 2017

e-ISSN:   2278-0181

 DOI:  http://dx.doi.org/10.17577/IJERTV6IS070131

Abstract

In practice, in selection of borrowed earth for construction of highway embankments, pavements, retaining structures, importance is paid to the quality of fines only as if quantity of fines is non-influential. It is necessary to understand the effect of quantity of fines on mechanical behavior of soil mixtures. With this objective, the plastic fines completely exclusive of coarse are added to the coarse fraction/sand completely free from fines in the proportion of 5% to 50% by weight of the sand. The compaction characteristics, the un-soaked and soaked CBR values of mixture in different proportion are determined. The results clearly indicated the fact that, there is a specific Critical Fines Content (CFC) for the mixture, such that the presence of plastic fines up to this critical fines content (CFC) is beneficial in terms of improving the gradation and increase in un-soaked CBR values. The CFC for the soil used in the study was found to be 30%. Hence, this study is useful to the practicing Civil Engineers in predicting the behaviour of soil mixtures based on the plastic fines content. Further, this study suggests the need for inclusion of quantity of plastic fines in addition to their quality in relevant Codes of practice.

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