International Journal of Engineering and Technical Research (IJETR)

Traditionally, asphalt mixtures were produced at high temperatures (between 150 oC -180 oC) and therefore referred as the hot mix asphalt (HMA) . recently a new technology named warm mix asphalt (WMA) was developed in Europe that allows HMA to be produced at lower temperature. Over years of research efforts a few WMA technologies were introduced including the foaming method using alpha-min and advera.WMA organic additives such as sasobit and asphalt an and chemical packages such as Evotherm,zycotherm and Cesca base RT were used as per literatures reviews.Benefits were found when lower temperatures were used to produce asphalt mixtures, especially when it comes to energy savings and emission reductions. The asphalt paving industry is constantly exploring technological improvements that will enhance the materials performance, increase construction efficiency conserve resources and advance environmental stewardship, current and impending regulations on emissions and energy conservation are making attractive the reduction in asphalt mix production temperatures Warm mix asphalt (WMA) is a means to this end and several systems have been developed including ,foaming, emulsions,additives,synthetic binders and others.WMA is produced at temperatures 20oC to 40 oC lower than that of Hot Mix Asphalt (HMA). The immediate benefit of producing and placing asphalt mixes at lower temperatures is the reduction in energy consumption, greenhouse gas emissions, flumes and odors generated at plant and the paving sites. Furthermore than technical benefits are more sustainable including reduction of short term binder hardening reduction of mixtures tenderness, possible extension of construction season. Several properties of asphalt concrete layer affect pavement performance these include mixing and compaction temperatures, optimum bitumen content, temperature susceptibility, fatigue properties, rutting, hardening of asphalt binders and temperature cracking potentials. The addition of polymers to asphalt concrete mixtures enhances the resistance of asphalt concrete to fatigue cracking, rutting, temperature cracking and stripping, with regards to mixing and compaction temperatures, rutting, fatigue and tensile strength properties studies have shown that the addition of polymers to asphalt mixes results in a substantial improvement in these properties. In present investigation commercial forms of polymer modified bitumen (PMB) of grade (SBS-PMB 40) and neat bitumen of VG 30 grade with and without WMA chemicals of readily blended type was used for characterization . The performance l of PMB mixes was be compared with 80/100 neat bituminous mixes and compaction temperatures for laboratory short term aged SBS-PMB 70 and VG 30 grade with and without warm mix asphalt chemicals, optimum dosage of WMA chemicals, Marshall mix design and Optimum binder content, Moisture and temperature susceptibility, for SBS-PMB 40 and VG 30 grade bitumen with and without chemicals for virgin as Aunilkmar.l, Dept of Civil Engg, Govt Engg College,Raichur – 584134,Karnataka,India Dr S.S. Awanti, Dept of Civil Engg, P.D. A College of Engineering, Kalaburgi-585102, Karnataka,India well as aged bitumen was evaluated and investigated . Some positive results were obtained when comparison of Marshall Parameters of HMA (VG30) and WMA (PMB-40) are investigated.