Laboratory Evaluation of Warm Mix Asphalt: A Preliminary Study

Zhan-Ping You ； Shu-Wei Goh

《International Journal of Pavement Research and Technology》 1卷1期 (2008/01) Pp. 34-40

https://doi.org/10.6135/ijprt.org.tw/2008.1(1).34

並列摘要

The asphalt industry has been assisting in the improvement of energy savings and the reduction of emissions to create more environmentally friendly paving construction for decades. Use of Warm Mix Asphalt (WMA) is an example of the industry's efforts toward improvement. WMA is produced in the temperature range from 17 to 56°C (30 to 100°F) lower than the traditional Hot Mix Asphalt (HMA). WMA's benefits include reducing energy consumption and emissions from burning fuels and volatiles generated from heated asphalt binder at the production plant and the paving site. Several technologies used in WMA are available today, such as Aspha-Min®,Sasobit®, Evotherm, and WMA-Foam. New technologies continue to be developed. Results found from a laboratory evaluation of WMA made with synthetic zeolite presented in this study. An asphalt mixture with the nominal maximum size of 12.5mm(1/2 inch) and PG64-22 binder was used in the laboratory evaluation. A control HMA mixture, WMA with 0.3% of synthetic zeolite, and WMA with 0.5% of synthetic zeolite, were used in the laboratory evaluation. The characteristics of asphalt and asphalt mixtures were examined using viscosity, dynamic shear modulus, and bending beam creep stiffness. Asphalt mixes were compacted via the Superpave gyratory and a simple performance test, the dynamic modulus test, was conducted to evaluate design purpose. Tests conducted found that the addition of the synthetic zeolite in the binder slightly decreased the binder's viscosity. Overall performance of WMA in terms of dynamic modulus has increased when compared to the control mix.

並列關鍵字

Dynamic modulus ； Dynamic shear modulus ； Master curve ； Simple performance test ； Superpave ； Synthetic zeolite ； Viscosity ； Warm mix asphalt.