Analysis of Modified HMA Using Crashed Glass

Abstract

Utilization of resources at balanced scale is the key to sustainability. Their use at a rate greater than their replacement causes the resources to deplete and will be a challenge to meet the demand for industry. Therefore, one of the viable options is Recycling. It is essential in order to meet demand and help to decrease land pollution and waste management. Pakistan, a developing country is facing negative impacts due to poor waste management. Amongst other material/resources, Glass is also potential material which can be recycled and utilized in the construction industry of Pakistan. Glass cannot be decomposed or incinerated. Thus, to achieve sustainability in this sector glass can be used as potential alternate to aggregate in asphalt in road construction. A project has been carried out at Military College of Engineering (NUST) to analyze the effect of crushed waste glass in HMA. The maximum size of glass was 4.75mm, in replacement of aggregate, sizing pan material to 4.75mm. Marshall Method was applied. 30 samples were prepared at laboratory out of which 12 were tested to obtain OBC which averaged to be 4.35%. Remaining 18 samples were tested after imparting varying percentage of crushed glass in the mix and resulted to 7.5% of the weight of aggregates. All the results were conforming to the international standards. This research positively recommends to use material such as plastic & iron filings in the mix for future studies.