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| Impact of freeze-thaw cycles on flexural tensile characteristics of asphalt mixture in cold plateau regions |
| Key Laboratory of Special Area Highway Engineering of Ministry of Education, Chang′an University, Xi′an, Shaanxi 710064, China |
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Abstract To accurately evaluate the effects of freeze-thaw(F-T) cycle on service level and service life of asphalt pavement in cold plateau regions, the bending test was applied to analyze the flexural tensile characteristics of asphalt mixture under F-T cycles. Exponential model and ANOVA were used to analyze the variation and significance of flexural tensile characteristics under F-T cycles, respectively. Loss ratio model and Logistics model were used to evaluate the deterioration of flexural tensile strength and strain under F-T cycles. The experimental results show that the flexural tensile strength and strain are declined with the increasing of F-T cycles. The deterioration of flexural tensile properties is decreased sharply during initial F-T cycles with gentle change after 15 to 21 F-T cycles. ANOVA shows that F-T cycle has obvious influence on flexural tensile characteristics. Loss ratio model of flexural tensile characteristics can well reflect the impact of F-T cycles.
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Received: 17 August 2014
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2015, Vol. 36 
