Journal of Jilin University(Engineering and Technology Edition) ›› 2020, Vol. 50 ›› Issue (1): 174-182.doi: 10.13229/j.cnki.jdxbgxb20180971

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Short-term water damage characteristics of asphalt mixture based on dynamic water scour effect

Ying WANG1(),Ping LI1(),Teng-fei NIAN1,Ji-bin JIANG1,2   

  1. 1. School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China
    2. China Municipal Engineering Northwest Design Institute, Lanzhou 730030, China
  • Received:2018-08-13 Online:2020-01-01 Published:2020-02-06
  • Contact: Ping LI E-mail:hylnuu@163.com;lzlgliping@126.com

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Abstract:

The dynamic water scouring effect caused by the vehicle load was investigated with a self-designed apparatus in this paper. The void ratio, water absorption and split tensile strength of asphalt mixture of AC-13 were monitored during the freeze-thaw cycle test by two different immersion modes (static immersion mode and dynamic scouring immersion mode). The microstructure changes were also tested with the aid of X-ray computed tomography (CT) to explore the mechanism of water damage of asphalt mixture both from the macroscopic and mesoscopic points of view. The experimental results show that with the increase of freezing-thawing cycles, the void rate under dynamic scouring mode and static immersion mode increases by 47.62% and 22.5%, respectively, and the water absorption rate increases by 263.2% and 86.4%, respectively. The freeze-thaw splitting tensile strength ratio (TSR) declines by 34% and 24.9%, respectively. The CT images analysis reveals that new frost-heave voids are produced in the inner part of mixtures, and some of the aggregates are also spalled at the outer edge. Dynamic water scouring will accelerate the shedding of fine aggregates and expand the volume of voids correspondingly. The deterioration of the anti-water property of the mixture under dynamic water scouring was more obvious.

Key words: road engineering, asphalt mixture, water damage, dynamic water scour, freeze-thaw cycle, void ratio

CLC Number: 

  • U414

Fig.1

Schematic diagram of dynamic water scour simulation test apparatus"

Fig.2

Flow chart of indoor simulation test for water damage study under short term"

Fig.3

Synthetic grading curve of AC?13"

Fig.4

Development of void ratio with cycle times"

Fig.5

Development of relative growth rate of void ratio with cycle times"

Fig.6

Development of water absorption with cycle times"

Fig.7

Development of average growth rate of void (water absorption) with cycle times"

Fig.8

Development of TSR with cycle times"

Fig.9

Development of freezing-thawing damage amount with cycle times"

Fig.10

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