고온 내변형 아스팔트혼합물 선정을 위한 변형강도 임계치 결정 방안

초록

Deformation strength (SD) is a property which shows relatively good correlation with rut resistance of asphalt mixtures at high temperature. The Asphalt Pavement Analyzer (APA) is widely used as an equipment for estimating rut resistance of asphalt mixtures. The APA was used as corresponding property of the SD to estimate rutting resistance of asphalt mixtures. Many data were collected to establish the correlation of SD with APA. For SD test, the specimen is submerged into the 60oC water for 30 minutes before applying a vertical load at the speed of 50mm/min to obtain peak load (P) and deformation (y) for SD calculation. For the same materials, APA test was performed. Relation of the SD with APA rut depth was evaluated using regression analysis. The R2 value was 0.76, indicating this simple test procedure being a possible method for predicting deformation resistance of asphalt concretes at high temperature. It was also shown that, using the regression model, minimum value(s) of SD of surface course asphalt mixture or binder course for a particular road level can be determined. The limit values may be possible to use as cut-off value(s) of asphalt mixtures for the layer after further elaborated studies.

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