Laboratory Evaluation of HMA and WMA in BC layer

Warm mix asphalt (WMA) is a relatively new and emerging technology for the asphalt Industry. The goal of WMA is to produce mixtures with similar strength, durability, and performance characteristics as HMA using substantially reduced production temperatures. It offers potential construction and environmental advantages over traditional hot mix asphalt (HMA). Several new processes have been developed to reduce the mixing and compaction temperature of hot mix asphalt without scarifying the quality of resulting pavement. Research in the laboratory was carried out to determine if the addition of Sasobit (WMA) has potential to increase the stability comparison with hot mix asphalt (HMA). For the present study, Sasobit has been tried as additive to achieve the higher stability at low temperatures. The addition of Sasobit to bituminous mix has been evaluated by testing their laboratory performances as compared to HMA mixes with different binders such as VG-10, VG-30 and CRMB-55. Marshall Mix properties namely stability, flow, bulk density, air voids, VFB and VMA was evaluated for both HMA and WMA. Indirect tensile test to evaluate the volume of air voids and Tensile strength ratio at different blows as 40, 60 and 75 for both conditioned and unconditioned specimens prepared by HMA and WMA with different grade binders. And the present research, it has been seen that WMA technology reduces 20percent temperature as compared with HMA technology .And also been seen that, there are changes in volume of air voids and tensile strength ratio for both conditioned and unconditioned specimens.