Volume No. 5 Issue No.: 4 Page No.: 972-977 April-June 2011

 

A STUDY ON THE CHANGE IN SWCC PARAMETERS OF A LOCAL SOIL DUE TO FLY ASH ADDITION

 

Malaya C.* and Sreedeep S.

Department of Civil Engineering, Indian Institute of Technology Guwahati, Assam (INDIA)

 

Received on : January 08, 2011

 

ABSTRACT

 

The Soil-Water Characteristic Curve (SWCC) is central to the behavior of unsaturated soil. It is generally expressed in terms of a graphical relationship between soil suction and water content (or saturation). The parameters defining this SWCC are important input for unsaturated soil modeling. It is believed that each soil has got a unique SWCC and hence, unique SWCC parameters, that may get influenced by different factors. However, there are not many studies that deal with the changes in drying SWCC parameters of soil due to the addition of fly ash. With this in view, the present study aims to investigate the variation of SWCC parameters due to the mixing of fly ash with a locally available sandy soil. It can be noted that the fly ash has been used to improve the growth some plants by providing some essential nutrients and fly ash mixed soil remain in an unsaturated state for most of the cases. SWCCs have been obtained for sand and sand-fly ash mix using a tensiometer and volumetric water content sensor. The details of the methodology adopted in this study are presented in the paper. Based on the test results, the changes in the SWCC parameters of sand due to the addition of fly ash are analyzed.

 

Keywords : Unsaturated soil, Fly ash, Soil-Water Characteristic Curve (SWCC), Parameters, Modeling

 

 

BACK