Recycling of asphalt from roads with metropolitan lahore environment and their compatibility assessment
Paper Details
Recycling of asphalt from roads with metropolitan lahore environment and their compatibility assessment
Abstract
Asphalt roads are very popular in urban areas and a major share of its budgetary provisions has spent over rehabilitation of road network in Metropolitan Lahore-Pakistan. Furthermore, release of GHG emissions in rehabilitation activities impacts negatively over the environment. Ultimately the government decided to opt hot in-place recycling of such old roads. This strategy is not only economical but saves heavy GHG emissions and landfill allocations. During the year 2011 a group of urban asphalt roads were selected for hot in-place recycling. It consists of heating, mixing, placing and compacting the upper asphalt layer at site, in one go. Innovative job mix formula (JMF) using maximum quantity of reclaimed materials and addition of minimum quantity of virgin asphalt binders were adopted. Amongst this group of roads, one segment of road, from Punjab Civil Secretariat to historical monument of Chouburji was selected to observe the operational asphalt behavior throughout its life period till June 2018. This trial segment was closely watched and there was no sign of shearing, scuffing and rutting etc. associated with aging of asphalt surfaces. The test chunks and cores from asphalt layer were subjected to lab testing. Quantity of bitumen binder and compaction of asphalt core values have been found with in permissible limits of original job mix formulae. The results indicate that environmental factors like ultraviolet sun rays, rain precipitation and variable traffic volume of Lahore could not damage the asphalt behavior during its anticipated life time till latest inspection in June 2018.
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