Fatigue Characteristics of Hydrated Lime Modified HMA

Characterizing the fatigue cracking damage of asphalt concrete pavements is considered one of the valuable methods for improving the design of asphalt concrete pavements. Hydrated lime (HL) is widely used in asphalt mixtures as a multifunctional additive (filler). In spite of wide use of HL in asphalt pavements, the fatigue characteristics of HL modified asphalt mixtures are not well understood. This paper studied the effect of the addition of HL on phenomenological fatigue model parameters. Moreover, researchers investigated the response of the phenomenological fatigue model parameters of HL modified asphalt mixtures under frequency and temperature variation. A controlled stress split tension fatigue test was conducted to study fatigue characteristics of HL modified asphalt mixtures. A large fatigue database of laboratory testing was developed to achieve this goal. Based on the fatigue test results, it was observed that, the intercept (a) of the S-N fatigue curve increased with the addition of HL. The slope (b) of the S-N fatigue curve seemed to be independent of mixture type. Fatigue model parameters (a and b) could be considered constants at low loading frequencies, but could not be considered constants for different testing temperatures.

並列關鍵字

Fatigue characteristics ； Hydrated lime ； Loading frequency ； Temperature

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