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제안 방법
- In this study, common asphalt (AP-5) was modified with two chemical compounds to improve resistance against plastic deformation. The compounds employed here are unsaturated polyester resin and polyoctenamer which is frequently used as plastisizer in the rubber industry.
- In order to control the size effect of the aggregate added to the asphalt, only aggregates of diameter of 13mm were used. To see the effect of modification, mechanical properties (tensile strength and Marshall stability) of modified asphalt, tests were conducted. Test were also done measuring for the penetration grade, and viscosity; and TMA was used to measure changes in resistance against plastic modification, and IR and GPC were used to test the bonding possibility between asphalt and modifiers.
- To see the effect of modification, mechanical properties (tensile strength and Marshall stability) of modified asphalt, tests were conducted. Test were also done measuring for the penetration grade, and viscosity; and TMA was used to measure changes in resistance against plastic modification, and IR and GPC were used to test the bonding possibility between asphalt and modifiers.
- First, the effects of modifiers were examined. Modifier contents were set at 2wt%, and initiators (peroxides) were added in related modifiers.
- AP-5, 2% Vestenamer, and 1% GRT were mixed together for 3 hours to prepare a specimen(APVR2-1. Table 4 presents the Marshall stability values of the modified asphalt and neat asphalt.
- An IR test was conducted to check for reactions between asphalt and Vestenamer. The results are shown on Figure 6.
- Thus, there is a high possibility that the double bonds of Vestenamer had reacted or linked with AP-5 through hydrogen abstraction reaction by peroxide and created a new compound with an improved property. In order to test this possibility, IR tests of 2% Vestenamer-modified asphalt (APV-2) were conducted. However, because of different concentrations between Vestenamer and AP-5, and the small amounts of vinyl groups in Vestenamer, it was difficult to decide whether a reaction had taken place or not.
대상 데이터
- All asphalts used in experiments were AP-5 (Inchon Oil) and had penetration grades between 60 and 70. Polyoctenamer (‘Vestenamer’, DegussaHuls), unsaturated polymer made from polymerization of cycleoctene that has a double bond of C4=C5, and unsaturated polyester resin (UPR, Aekyung Chemicals) were used as modifiers.
- The specimens inside the molds were cured at room temperature for 24hours. Seven specimens were made for each type. The specimens were then placed in a 60°C water bath for 30minutes, towel dried, and tested by a compression tester (HJ-1191, Heung-Jin Co.
이론/모형
- The specimens were molded using a cylindrical mold 50mm in diameter and 100mm in length. The specimens were made and tested in accordance with guidelines of Marshall asphalt mix by ASTM D 1559. First, a 13mm aggregate was heated at 180°C for more than 24hours.
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