Evaluation of Engineering Properties of Recycled Asphalt Concrete Mixtures Containing 100% Original Asphalt Concrete Using Three Types of Asphalt Recycling Agent
Keywords:
Recycled Asphalt Concrete Mixtures, RAP, Asphalt Recycling AgentAbstract
This study investigated the laboratory engineering properties of 100 percent reclaimed asphalt pavement (RAP) mixtures, modified with three types of asphalt recycling agent. The RAP contained asphalt cement grade AC 60–70 as the original binder, with a residual RAP binder content of 4.50% by aggregate weight, equivalent to 54 grams. The recycled asphalt concrete specimens were prepared using the Marshall method and divided into four groups: Group 1 RAP without asphalt recycling agent (R), Group 2 RAP with AC 80–100 (RAC), Group 3 RAP with RA5 (RRA) and Group 4 RAP with PET (RPET). The asphalt recycling agent was added at proportions of 5.6, 11.1 and 16.7 % by weight of the residual RAP binder, using the dry mixing method. The engineering properties tested included density, stability, flow, indirect tensile strength, stiffness modulus, rutting resistance, and fatigue cracking resistance. The test results showed that, compared with Group 1 (R), the specimens in Groups 2 (RAC), 3 (RRA), and 4 (RPET) exhibited increased indirect tensile strength and stiffness modulus at 5.6% asphalt recycling agent content, but decreased values at 11.1% and 16.7%. An exception was found in Group 3, where at test temperatures of 30 degrees Celsius and 40 degrees Celsius, the stiffness modulus decreased at 5.6% RA5 content and continued to decrease with higher RA5 contents. Flow values and fatigue cracking resistance increased with the addition of asphalt recycling agent, whereas stability decreased as asphalt recycling agent content increased. For density and rutting resistance, Groups 2 (RAC) and 3 (RRA) showed increasing values with higher AC 80–100 and RA5 contents, while Group 4 (RPET) showed an initial increase followed by a decrease as PET content increased. In conclusion, the specimens in Group 2 with 5.6% AC 80–100 exhibited the most suitable combination of indirect tensile strength, stiffness modulus, and rutting resistance for pavement performance under Thai environmental conditions.
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