UTILIZATION OF POLI-POLIA RIVER SAND, POLI-POLIA DISTRICT, EAST KOLAKA DISTRICT AS A FINE AGGREGATE ADDITIONAL MATERIAL IN ASPHALT CONCRETE MIXTURES TYPE OF ASPHALT CONCRETE WEARING COURSE (AC-WC)

Abstract

Concrete asphalt is one of the flexible pavement constructions in the surface course, consisting of coarse aggregate, fine aggregate, and asphalt as its mixture. Good and high-quality road construction depends on the quality and standard of the materials used. Realizing this, the natural resource potential in Southeast Sulawesi, particularly in East Kolaka, has significant material resources with great potential to be utilized and developed as a mixture for concrete asphalt. The quarry reserves for the Poli-polia River are abundant because the river flows through several regions such as Andowengga District, Poli-polia District, and Dangia District. Therefore, the author has taken the initiative to use Poli-polia River sand as the fine aggregate in the concrete asphalt mixture. The work follows the 2010 Bina Marga general specifications. This research aims to determine the characteristics of the fine aggregate from Poli-polia River sand, the optimum asphalt content value with the addition of Poli-polia River sand as fine aggregate, and whether the use of Poli-polia River sand as fine aggregate meets the Marshall characteristic specifications in the concrete asphalt mixture. The research results show that the use of Poli-polia River sand as an additional fine aggregate in the concrete asphalt mixture of the asphalt concrete wearing course (AC-WC) type meets the 2010 Bina Marga specifications. The Optimum Asphalt Content (OAC) result is 6.46%, with the following mixture characteristics: Stability (kg) = 1,321.0 > 800, Flow (mm) = 2.3 > 2-4, Marshall Quotient (kg/mm) = 571.3 > 250, VIM (%) = 4.2 > 3-5, VMA (%) = 17.8 > 15, VFB (%) = 77.0 > 65, and Density = 2.187 t/m?. The residual stability index after 24-hour immersion at 60°C is 100.20%.