Effect of Humidity-tail Gas Combined Action on Skid-resistance Performance of Asphalt Mixture
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1.College of Civil and Transportation Engineering, Hohai University, Nanjing 210024, China;2.Nanjing Yuhua Construction Development Co. Ltd., Nanjing 210012, China;3.China Design Group Company Limited, Nanjing 210007, China

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U418.6

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    Abstract:

    Based on the engineering background that the vehicle exhaust emission forms oil film on the surface of tunnel asphalt pavement, which leads to the rapid attenuation of pavement skid-resistance performance, the attenuation law of asphalt mixture skid-resistance performance under the combined action of humidity and tail gas and the formation mechanism of tail gas oil film are explored. Using constant temperature and humidity curing box and self-made exhaust gas treatment system, the combined effect of different humidity and tail gas on three kinds of asphalt mixture rut plate specimens was simulated, and the British pendulum number (BPN) was used to characterize the skid-resistance performance of the specimens. In addition, molecular dynamics simulation was carried out on the water (anhydrous) tail gas - asphalt interface to explore the micro mechanism of tail gas oil film formation. The results show that the British pendulum number of three asphalt mixtures shows a linear downward trend with the increase of tail gas treatment time under relatively dry and completely moist conditions. After tail gas treatment for 1h under completely moist conditions, the attenuation range of skid-resistance performance of OGFC mixture is nearly 30% lower than that of the other two mixtures. OGFC mixture has better skid-resistance performance, and has good skid-resistance durability under the combined action of humidity and tail gas. The skid-resistance performance of asphalt mixture caused by tail gas oil film is difficult to dissipate naturally and has cumulative effect. Tail gas oil film is the main reason for the rapid attenuation of skid-resistance performance of asphalt mixtures. The tail gas oil film is mainly formed in the process of cooling after the tail gas is discharged. Water molecules mainly exist in the range of 0~5 ? near the tail gas molecules, filling the gap between tail gas molecules. Its strong polarity can attract tail gas molecules and contribute to the adsorption of tail gas on the surface of asphalt molecules.

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WU Jiantao, MA Xinyuan, CAO Yungang, CAO Pengfei, CHEN Jun, CHEN Jie. Effect of Humidity-tail Gas Combined Action on Skid-resistance Performance of Asphalt Mixture[J].同济大学学报(自然科学版),2022,50(7):1017~1025

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History
  • Received:August 30,2021
  • Revised:
  • Adopted:
  • Online: July 22,2022
  • Published: