Investigasi Perkerasan Komposit Kerikil Aspal Berbasis Crumb Rubber (CR-ECC) Berdasarkan Mehanical Properties dan Durabilitas

Abstract

The increasing number of motorized vehicles in Indonesia has caused the amount of used tire waste to increase. This can be dangerous for the environment because used tires are very difficult for soil microbiology to decompose and take a long time to break down. One way to deal with used tire waste is to use it as construction material and apply it to civil construction pavement, especially roads. In this research, the application of used tire waste is used as a forming material, namely Engineered Cementitious Composite (ECC). The results of this research used Mix Design proportions of 15 variations and were divided into three types, namely type I coded FCR, Type II coded CRE and Type III coded TCRE. where each type has differences in the ratio of aggregate composition and water-cement factor. The percentage proportions of the crumb rubber mixture are different, namely 0%, 2.5%, 7.5%, 10%, 12.5% of the cement weight. Type-I composition with specimen code FCR, uses 250 kg of cement per cubic meter, cement water factor = 0.415, weight of sand = 1.1 times the weight of cement, Type-II with specimen code CRE also uses cement of 250 kg per cubic meter , cement water factor = 0.42, weight of sand = 1.1 times the weight of cement. Type-III with specimen code TCRE, uses cement weight taken as 260 kg cement per cubic meter, cement water factor = 0.45, and sand weight = 1.1 times the weight of cement. while the superplasticizer was 2.5% and palm shell ash was taken at 10% of the cement weight for the three types of test objects. There were 27 cube-shaped test objects measuring 150x150x150 mm and 9 beam-shaped test objects measuring 150x150x600 mm. Then trial and error testing was carried out to obtain the CR-ECC compressive strength value at 3 days of age. Based on the results of the CR-ECC average compressive strength test, it ranges from 17.70 to 37.28 MPa. Based on the results of the CR-ECC asphalt gravel compressive strength test, the highest compressive strength value was in sample C at the age of 28 days, namely 6.85 Mpa. The results of the bending test show that the largest average value of maximum load is on sample 28A with a value of 6.83 kN and the average value of maximum deflection is on sample 28 B with a value of 10.64 mm. The results of the impact test at the age of 3 days showed hairline cracks at the 5th blow and cracks along the right and left edges or edge breaks at the 8th to 10th blows. Meanwhile, the impact test at the age of 7 days resulted in an average of hairline cracks occurring at the 8th and no blows. edge rupture occurs. And at the age of 28 days, the average result was that a line crack occurred at the 9th blow and no two ruptures occurred. Apart from that, from the results of the fire resistance test at the age of 3 days, it was found that at a combustion temperature above 300 degrees, the asphalt on the surface of the test object began to melt, with signs of water coming out of the test object. Meanwhile, at the age of 7 days, asphalt begins to melt at a combustion temperature above 400 degrees and at the age of 28 days, asphalt begins to melt at a combustion temperature above 500 degrees celsius.