ABEL GEBRETSDIK, ABRAHAM SEBSIBE, MILLION BAYOU, RUTH TADESSE, SOSINA SEYOUM & DR. TENSAY GEBREMEDHIN
This research use Polyethylene Terephthalate as hot mix asphalt modifier. Polyethylene Terephthalate is one component of plastic material, and the research is concerned with the possibility of utilizing waste plastic bottle as an ingredient in asphalt concrete to increase the mixture engineering property and at the same time decrease cost of construction by decreasing the amount of asphalt cement (bitumen) required. The experimental work includes all aggregate quality physical property tests, bitumen tests and asphalt concrete mix design by using Marshall Method of mix design for both modified and unmodified mix. In this specific investigation the dry process is used for introducing the plastic in to the asphalt cement; in dry process Polyethylene Terephthalate size passing 1.18mm sieve. Overall, more than 114 Marshall Samples with plastic content of 0%, 0.3%, 0.6%, 0.9%, 1.2% and 1.5% also Bitumen content 4%, 4.5%, 5%, 5.5%, 6% and 6.5% both by weight of total aggregate were prepared. The first step of this investigation was to find the proper method of mixing and plastic size that could be effectively employed in to the asphalt cement. Due to this trial and error procedure additional 82 Marshall Specimen were prepared and tested. These researches only focuses on modifying the asphalt mix mechanical property and have not made any investigation on its environmental effect while in use.