Resistance Test of Porous Asphalt Using Liquid Ashburton and Beach Sand against Immersion Time and Temperature

Abstract

The pavement conditions often suffer premature damage due to the influence of surface water or flooding. One solution to overcome surface water is by making a pavement layer with an open gradation, known as porous asphalt, so that water seeps into the top layer vertically and horizontally. The pavement layer that is submerged by rainwater or seawater overflows will cause the structure of the aggregate and asphalt bonds to become weak to endanger passing traffic drivers. The use of beach sand as fine aggregate is often found in coastal areas that do not have rivers, so that only beach sand can be used as the main material for fine aggregate in the asphalt mixture. The use of Ashburton liquid as a local raw material with abundant stocks in Buton Island needs special attention to raise the city government's welfare. At the same time, this research can show the binding power of liquid Ashburton with aggregate and its effect on saltwater and freshwater immersion. This study aims to determine the magnitude of using beach sand as a mixture of porous asphalt using Ashburton liquid on immersion time and temperature effects. To test porous asphalt performance, research was carried out in the laboratory by making 60 test objects using Australian open gradations with 6 variations of asphalt levels to determine the Optimal Asphalt Content (KAO). Subsequently, 52 test specimens were made with 3 variations of the immersion time in saltwater and freshwater. The test results using 7 levels of liquid asphalt button with a mixture of beach sand obtained the optimal asphalt content of 8.62%. Asphalt content of 8.62% Asbuton liquid asphalt mixed with beach sand with Australian gradations obtained the marshall quotient value between 238.75 - 62.24 kg / mm for saltwater immersion and 19.14% -22.72% for porosity freshwater immersion ranged from 261.76-96.36 kg / mm for saltwater immersion and 19.14% - 22.72% for freshwater immersion. Permeability values ??were obtained between 0.22 - 0.51 cm / s for brine immersion and 0.22 - 0.33 cm / s for freshwater immersion. The weight loss through the Cantabro test was found to be between 12.95% - 52.6% for saltwater and 11.26% - 30.47% for freshwater immersion.

Keywords: Beach Sand, Liquid Ashburton, Porous Asphalt, Immersion, Temperature.