The Effect of Coconut Fiber in Improving the Deformation Resistance of Asphalt Concrete Mixtures
Abstract
Flexible pavement experiences permanent deformation known as rutting and shearing. This deformation is usually in the form of longitudinal deflections that occur in the vehicle wheel tracks and is an accumulation of deformation caused by increased loads. Because the road surface is no longer waterproof, damage can become more severe. To increase the strength of the asphalt concrete mixture in maintaining the performance of the mixture so that it does not experience deformation or rutting, efforts are made to add coconut fiber to the asphalt concrete mixture. This produces a strong asphalt mixture. The aim of this research was to determine the effect of adding coconut fiber in increasing the strength and resistance of the asphalt concrete mixture to permanent deformation. Wheel tracking testing is a simulation in which the wheel load moves back and forth across the test object. The deformation resistance of a predetermined test object can be measured by looking at the results obtained from the groove depth (Rut Depth) after passing a number of passes, or the Deformation Rate (RD) in mm/min. Apart from that, the Dynamic Stability (DS) value can also be measured, namely the number of passes required to form a groove 1 mm deep. The dynamic stability (DS) and Deformation Rate (RD) can be calculated using the Suherman formula. Based on the value of the optimum asphalt content (KAO) and the percentage and optimum length, testing was carried out using the Wheel Tracking test. The sample was compacted with a compactor 75 times, and the size was 30 cm x 30 cm x 5 cm. Tests were carried out at temperatures of 40oC and 60oC. Samples were placed in an oven at temperatures of 40oC and 60oC for 4 h before being tested. The rutting depth was recorded during testing. Dynamic stability (DS) and permanent deformation were used to evaluate the stability of the asphalt mixtures at high temperatures. The study demonstrated that the use of coconut fiber can increase the stability value of the asphalt concrete mixture. The relationship between the rutting behavior and the temperature of 40oC resulted in a total deformation of 2.28 mm with a deformation rate of 0.0080 mm/min for a temperature of 0oC, 2.42 mm with the rate of 0.0093 mm/min for a temperature of 40oC and 2.48 mm with the rate of 0.0220 mm/min for a temperature of 60oC.
Keywords: wheel tracking, temperature, asphalt concrete.
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