American Society of Civil Engineers


Methodology of Mixing and Compaction Temperatures for Modified Asphalt Mixture


by Zheng-qi Zhang, (Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang’an University, Xi’an, Shaanxi, China), Jing Tao, (School of Electronic and Control Engineering, Chang’an University, Xi’an, Shaanxi, China), Bo Yang, (Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang’an University, Xi’an, Shaanxi, China), and Ning-li Li, (College of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an, Shaanxi, China)

pp. 34-41, (doi:  http://dx.doi.org/10.1061/41043(350)5)

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Document type: Conference Proceeding Paper
Part of: Road Pavement Material Characterization and Rehabilitation: Selected Papers from the 2009 GeoHunan International Conference
Abstract: To study methodology of determining mixing and compaction temperature for modified asphalt mixture, the Superpave gyratory compaction tests are adopted to study the volumetric parameters of several modified asphalt mixtures. First, the rational compaction temperature is obtained based on the optimal compaction effect, and according to the relationship of viscosity with temperature and shear rate considerations, a shear rate of 60(1·s–1) is proposed to measure the viscosity of modified asphalt. At this shear rate, the viscosity of modified asphalt at different temperatures can be obtained and the viscosity-temperature curve can be achieved. As a result, the mixing and compaction temperature for modified asphalt can be determined to deliver 0.17±0.02Pa·s and 0.28±0.03Pa·s for HMA mixing and compaction, respectively. The difference between temperatures obtained with the methodology and temperatures at which optimal compaction effect can be obtained is less than 5°C. The proposed temperatures are also kept in good accordance with paving practice.


ASCE Subject Headings:
Temperature effects
Soil compaction
Asphalts
Mixtures