چكيده به لاتين
Summery
In order to improve the performance of asphalt concrete, the faced-centered central composite design response surface methodology was used to characterize physical properties containing aggregate, bitumen, void and temperature which play the important role in asphalt mixtures. The resilient modulus (Mr) and indirect tensile strength (ITS) of asphalt concrete are the important inputs for computation of pavements responses under traffic loading, so in this study these are the responses that should be analyzed and optimized by testing in face-centered central composite models. Also response surface of the overall desirability was established to optimize these two responses simultaneously. Based on the results achieved, grade 5 for aggregate, 40/50 influence degree for bitumen, 3% for void and 20℃ for temperature were found to be optimal values. Moreover, regression models were developed to predict Mr and ITS in asphalt mixtures.
Key words: Asphalt concrete, Quality improvement, Response surface methodology, Resilient modulus, Indirect tensile strength
