Tuesday, August 30, 2016

New M.Tech. Thesis Submitted from Civil-Geo

Utilization of Reclaimed Concrete Aggregates in Granular Sub Base and Stone column by Shahbaz Singh 

For the first time, construction and demolition waste rules, 2016 has been notified by the Union Government and rules states that at present India produces nearly 530 million tons of construction and demolition (C&D) waste annually. This construction and demolition waste is a resource not a waste. Forty percent out of C&D waste is waste concrete, so in this study an attempt has been made to utilizethis so that it does not put any adverse effect on our environment. Also continous land mining for aggregates creates huge pollution and effects our environment very much. So there has to be an alternative souce for aggregate production. Reclaimed concrete aggregates (RCA) is used an alternate in other fields but till date a very little use of these aggregates is reported in geotechnical engineering. In Swachh Bharat Mission (2014) it is stated that RCA can be utilized in plain cement concrete (PCC) and in reinforced cement concrete (RCC), no where it is written it can be used in geotechnical engineering. Literature review shows that only thirty percent of RCA can be used in PCC or RCC , so still the problem of remaining seventy percent remains which will put adverse effects on environment. This is high time to use RCA in geotechnical enginering.In this study an atempt has been made to utilize RCA in granular sub base and in stone column. This thesis work is divided into three phases, in first phase various laboratory tests have been performed on natural aggregates and RCA to check its use in geotechnical engineering, in second phase natural GSB with different percentages of RCA i.e, 0%, 20%, 40%, 60%, 80% and 100% is been prepared and laboratory tests have been done to check their compatibility according to Indian standards. And in third phase RCA has been used in stone column in which Plaxis software package is used to analyse, wheather RCA can be used in stone column. Results has been found satisfactory in all the three cases.