การใช้ยางพาราในงานก่อสร้างผิวทางหลวง

Abstract

Transportation is an important factor in the development of a country. The transport mode that is easy to access is in area transport the increasing in road usang due to increasing road traffic caused nationwide demage the highway pavement. One way of controlling pavement damage is to use Natural Rubber Latex (NRL) km,m,hhto improve the Engineering properties of Asphalt Cement (AC). This study set out to find the maximum natural rubber latex content that can be mixed with asphalt cement with the resulting enhancement of the mixed binder. This research was divided in three parts. The first part was the test of AC mixed with Natural Rubber Latex various combination ratio of AC to NRL 100:0 95:5 90:10 85:15 and 80:20 Penetration Softening Point Resistance to Stripping of Aggregates Binder Ductility Flash point Marshall Stability and Skid Resistance tests showed that the ratio AC: NRL of 90:10 gave the optimum value for these test results. The Second part tests involved the testing of Reycled Asphalt Pavement (RAP). The unaxial compressive strength testing were conducted for a mix this RAP and Natural Rubber Latex 5 10 and 15 percent by weight and Portland cement 3 5 and 7 percent by weight of RAP. Result from the laboratory test showed that the combination of 5 percent Natural Rubber Latex and 7 percent cement gave unaxial compressive strength and California Bearing Raio were hightest values of 23.89 ksc and 42%, respectively. The third part was about conducting test in-situ on the pilot highway pavement and coring of samples for laboratory testing. The tests showed that both the pavement with 5 and 10% NRL contents could take a load of 20 ton per square meter, the skid reistance value and result of Marshall Stability test of the cored samples showed that they met the requirement of Thailand Department of Highways. The optimal ratio of AC to NRL that gave the best result was 90:10, in other word, the maximum amount of NRL that Can be added was 10 percent.