Effect of Adding Waste Crushed Glass to Asphalt Mix

Abstract

Glass is widely used in our daily life, and with the continuously increased consumption, a large amount of waste glass is generated annually. The best way to deal with these wastes is to recycle and reuse them as raw materials or modifiers. This thesis aims to study the performance of asphalt concrete pavement in which a fraction of aggregate is replaced with waste crushed glass. In order to meet the objectives a total of 60samples were prepared by adding crushed glass to the mix with 5%, 10%, and 14% by aggregate weight meeting the standard DoR gradation specifications. The fine aggregates have been replaced as per proportion of the glass particles added. With the increase in glass content the optimum binder content of the mix decreased. The stability values increasedupto 10% glass content and decreased when the glass content was further increased to 14%. The maximum increase in stability value was found to be 12.9% at 10% glass content. Flow values decreased at higher glass contents.Slight decrease in bulk density of the mix was noted. Air voids increased and voids filled with bitumen decreased at higher glass content due to decrease in binder content and flow values but the values were found to be within range. As per the cost estimate maximum cost saving was possible at 14% glass content. Despite decrease in Marshall stability value, the decreased value was within the specifications and hence the use of this glass content was found economically viable. A maximum cost saving of NRs. 1020.45 per cu m was estimated at 14% glass content.