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Long term performance of warm mix asphalt versus hot mix asphalt

Journal of Central South University 2013年第1期20卷 256-266页

作者： Ziari Hasan behbahani hamid Izadi Amir Nasr Danial School of Civil Engineering Iran University of Science and Technology

The fatigue behavior, indirect tensile strength （ITS） and resilient modulus test results for warm mix asphalt （WMA） as well as hot mix asphalt （HMA） at different ageing levels were evaluated. Laboratory-prepared samples were aged artificially in the oven to simulate short-term and long term ageing in accordance with AASHTO R30 and then compared with unaged specimens. Beam fatigue testing was performed using beam specimens at 25 ℃ based on AASHTO T321 standard. Fatigue life, bending stiffness and dissipated energy for both unaged and aged mixtures were calculated using four-point beam fatigue test results. Three-point bending tests were performed using semi-circular bend （SCB） specimens at -10 ℃ and the critical mode I stress intensity factor K1 was then calculated using the peak load obtained from the load-displacement curve. It is observed that Sasobit and Rheofalt warm mix asphalt additives have a significant effect on indirect tensile strength, resilient modulus, fatigue behavior and stress intensity factor of aged and unaged mixtures.

关键词： warm mix asphalt hot mix asphalt fatigue behavior resilient modulus tensile strength stress intensity factor ageing

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Calibration and validation of a new time-based surrogate safety measure using fuzzy inference system

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Journal of Traffic and Transportation Engineering(English Edition) 2016年第1期3卷 51-58页

作者： Navid Nadimi hamid behbahani hamid Reza Shahbazi School of Civil Engineering Iran University of Science and TechnologyTehranIran Power Electrical Faculty Shahid Rajaee Teacher Training UniuersityTehranIran

Surrogate safety measures （SSM） are suitable tools to detect dangerous situations. These indicators can be applied as a warning strategy in collision avoidance systems （CAS）. Timeto-collision （TTC） and post-encroachment time （PET） are two important time-based SSM that identify the probability of a rear-end collision. TIC refers to the imminent danger, and PET implies the potential danger. However, sometimes the results from each indicator are inconsistent. An appropriate warning strategy for CAS can be developed using a new index that combines the properties of both TTC and PET. For this purpose, a new mixed index （MI） is proposed. In order to develop this MI, three main microscopic parameters, clearance, speed and the relative speed, are simultaneously applied to the leading vehicle. To cali- brate MI, based on a fuzzy inference system （FIS）, a value would be determined by a combination of TTC and PET at each instant and then by regression analysis the model parameters would be determined. Finally, MI, TIC and PET values for real car-following scenarios on the 1-80 freeway are determined and compared. The results show that MI may be more suitable in detecting the rear-end collision risk within the proper time and with less errors.

关键词： Surrogate safety measureTime-to-collisionPost-encroachment timeFuzzy inference system

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