Study of physical characteristic of rubberized hot mix asphalt based on various dosage of natural rubber latex and solid rubber

摘要

Currently,the implementation of rubberized asphalt technology become the main concern of Government in natural rubber producing countries,especially Thailand,Indonesia,and Malaysia.The policy is intended to increase natural rubber domestic consumption and support national infrastructure project.Rubberized asphalt is made from the mixture of hot asphalt with polymer such as natural rubber either in the form of latex or compound.For field implementation,rubberized asphalt should be mixed with aggregate to form rubberized hot mix asphalt.The research was conducted to study the rubberized hot mix asphalt characteristic at laboratory scale.Types of natural rubber were used consist of cationic natural rubber latex(L2),4 hours prevulcanized natural rubber latex(L3),and semi-efficient solid natural rubber compound(KP2).The base asphalt used asphalt penetration 60/70,while the aggregate was obtained from Subang District,West Java,Indonesia.The trials were run at three stages i.e.analysis of pure asphalt and aggregate properties,determination of mixing and compaction temperature,followed with characterization of rubberized hot mix asphalt physical properties by using Marshall and Wheel Tracking Machine.The dosage of natural rubber addition was varied at 3,5,7 and 9%.Hot mix asphalt without rubber addition was used as control.The result showed that the addition of natural rubber into the asphalt penetration 60/70 raised the Marshall stability of rubberized hot mix asphalt.The initial Marshall stability value was 986 kg for pure hot mix asphalt became 1097 kg for 7% of cationic natural rubber latex,1103 kg for 5% of 4 hours prevulcanized natural latex,and 1110 kg for 7% of semi-efficient solid natural rubber compound.Thus,it could be concluded that the addition of 5-7% natural rubber improved the physical characteristic of rubberized hot mix asphalt as indicated by the increasing of Marshall stability value.