Volume No. 6 Issue No.: 2 Page No.: 212-221 Oct-Dec 2011

 

INVESTIGATIONS ON DYNAMIC RESPONSE OF COIR REINFORCED FLY ASH STABILIZED BLACK COTTON SOIL

 

M. Heeralal*1, M.V. S. Sreedhar and B. Yakaiah2

1. Department of Civil Engineering, National Institute of Technology, Warangal, Andhra Pradesh (INDIA)
2. Department of Civil Engineering, University College of Engineering, Osmania University, Hyderabad (INDIA)

 

Received on : August 14, 2011

 

ABSTRACT

 

Geo-technical engineers all over the world face challenges during construction of various structures in expansive soil deposits. Attempts have been made by several researchers to suggest solutions to these problems based on different concepts. In the design of flexible pavements, the importance of coefficient of elastic uniform compression is being appreciated world over. The conventional CBR based methods are not accounting the performance of pavements particularly in terms of development of ruts and their propagation. This study combines the need for not only stabilizing the B.C.Soil but also improving its dynamic performance of pavements. The basic objective of this study is to investigate the role of coir on resilience behaviour of the fly ash stabilized B.C.Soil. Fly ash which is an industrial waste byproduct generated by thermal power plants is used as stabilizing agent and coir (a product from coir industry) is used as reinforcing material to improve black cotton soils to control swell and to improve resilience. The optimum percentage of fly ash (type-F) for stabilization of the BC soil used in this investigation is found as 20%. The same combination is adopted in this study. To investigate the effect of coir on resilience behaviour, content of coir is varied at 0.5%, 1.0%, 2.0 % and 5.0 % by weight of soil solids. Coir content with the aspect ratios of 50, 100 and 150 are adopted. The coefficient of elastic uniform compression for various combinations is found by conducting laboratory cyclic plate load tests. The present study revealed that the addition of randomly distributed coir improved the coefficient of elastic uniform compression and hence improved the dynamic performance of the pavement was observed.

 

Keywords : Expansive soil, Coir, Fly ash, Coefficient of elastic uniform compression, Dynamic performance, Propogation

 

 

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