Stabilizing Recycled Asphalt Pavement with Large Aggregate

Abstract

This research studied the properties of recycled asphalt cement pavement (RAP) from Highway No. 12 in the control area of 0201 Mae Lamao – Tak, between km. 74+000 to km. 76+607. The properties were improved by mixing aggregate materials. 1 inch (25 mm.) limestone, which is the largest size of aggregate in pavement design. AC60/70 grade asphalt cement binders were used to determine the properties of remaining asphalt cement in recycled asphalt concrete materials and determine the appropriate amount of asphalt cement in the mixing ratio. From the test, it was found that the appropriate amount of asphalt cement, for used in designing the mixing ratio was 0.8%. Then, the mix ratio designing was made in accordance to the hot mix asphalt concrete design standard, using the Marshall method according Department of Highways standard DH-S 408/2532, by mixing 1 inch limestone aggregate at the mixing ratio of 4, 6, 8 and 10. The results of the performance test, by using stability and flow tests, showed that the aggregate stability became higher, the less aggregate materials ratio. And the flow rate decreased as the aggregate mixture ratio increased. The test results are within Department of Highways standards ’s acceptable value. Bringing recycled asphalt concrete from old pavements, to improve their properties for reuse, by 1-inch (25 mm) large aggregate ratio designing, not only helps to alleviate the growing shortage of natural resources, a problem affecting the construction industry, it but also reduces the carbon emissions generated by construction materials produced from quarries or mills, Complying to local and national policies. And complying to the BCG Economy Model, at Circular Economy aspect, which emphasizes utilization of various raw materials, throughout their life cycle. And reuse waste materials to create various products, especially high-value industrial products.