2017 journal article

Laboratory Evaluation of Workability and Moisture Susceptibility of Warm-Mix Asphalt Mixtures Containing Recycled Asphalt Pavements

JOURNAL OF MATERIALS IN CIVIL ENGINEERING, 29(5).

By: A. Kusam n, H. Malladi n, A. Tayebali  n & N. Khosla n

author keywords: Warm mix asphalt; Reclaimed asphalt pavement (RAP); Tensile strength ratio (TSR); Moisture susceptibility; Workability
topics (OpenAlex): Asphalt Pavement Performance Evaluation; Infrastructure Maintenance and Monitoring; Innovative concrete reinforcement materials
UN Sustainable Development Goals Color Wheel
UN Sustainable Development Goal Categories
9. Industry, Innovation and Infrastructure (OpenAlex)
Source: Web Of Science
Added: August 6, 2018

Warm mix asphalt (WMA) and recycled asphalt pavements (RAP) are two popularly used sustainable technologies in pavement industry. Because RAP materials contain aged binder, its use is limited to a certain percentage in hot mix asphalt (HMA) as it may affect the workability and, fatigue and thermal cracking performance. Higher percentages of RAP can be incorporated into HMA with softer asphalt binder or in combination with softening agent. However, the combination of WMA and RAP may allow for greater percentages of RAP without modifying the original HMA job mix formula. The objective of this study was to explore the use of higher percentage of RAP, using two different WMA technologies—Evotherm additive and foamed asphalt—to study the workability and moisture sensitivity of WMA-RAP asphalt mixtures. The study found that the use of WMA technologies can eliminate the need for a softer grade binder in high RAP mixtures.