| dc.description.abstract | The degradation of natural rubber (NR) molecular chains to produce degraded natural rubber (NRd) using photochemical methods has been successfully carried out. The degradation process was carried out using a 30-watt UV lamp, 0.25 mol H2O2, sodium lauryl sulfate (SLS) surfactant, and 20% dry rubber content of NR and carried out for 72 hours at 70oC. From Gel Permeation Chromatography (GPC) data, the molecular weight of NR decreased by 50%, with the polydispersity value decreasing from 35.11 to 7.5, indicating that NR had experienced chain termination. The FT-IR data shows that the termination of the NR molecular chain occurs in the C-C alpha bond to produce a terminal hydroxyl group marked by the appearance of vibration at wave number 3381cm-1. The resulting NRd is then mixed with asphalt with variations of NRd 8; 10; 12; 14; 16% to the mass of asphalt. From the test results of the essential characteristics of asphalt (softening point, penetration, and ductility), the addition of 12% NRd to asphalt is the most optimum mixture with a softening point, penetration, and ductility values of 60,5 oC, 56,75 (0.1 mm), and 105.5 cm respectively, which complies with SNI 8198:2015. The 12% Asphalt-NRd mixture was then added to aggregate to produce a sand sheet, and then its stability was tested using a Marshall tool. From the Marshall test results, the optimum ratio of the Asphalt-KAd mixture to aggregate was 6,35: 93,65, with values of marshall stability is meeting the SNI 06- 2489-1991. | en_US |
