Research on the Microstructure and Performance of Asphalt after the Salt Freezing Cycle

Abstract:

About more than 90% highway have adopted asphalt concrete pavement in China. A lot of quality problems appeared in the highway pavement due to freezing-thawing circulations under the condition of low temperature. The scanning electron microscope (SEM) was utilized to observe the microstructure of styrene-butadiene-styrene (SBS) modified asphalt and rubber powder modified asphalt before and after the salt freezing. Also three routine indicators (penetration, softening point and ductility) for the two kinds of asphalt were tested before and after the salt freezing. The analysis results showed that the temperature susceptibility of SBS modified asphalt and rubber powder modified asphalt were all increased and the high temperature performance and low temperature performance of both asphalt were reduced after the salt freezing cycles as the same time the performance of rubber modified asphalt after salt freezing cycle was superior to SBS modified asphalt by comparing the basic indicators of them.

• Periodical: Applied Mechanics and Materials (Volume 575)
• Pages: 238-244
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.575.238
• Online since: June 2014
• Authors: Ji Wei Han, Ya Nan Cui*, Zhen Li, Chao Li, Zhen Zheng Liu
• Keywords: Asphalt, High, Low Temperature Performance, Microstructure, Salt Freezing Cycle, Temperature Susceptibility

References

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DOI: 10.1061/41064(358)328

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