Xinsheng Li, Zhaoxing Xie, Wenzhong Fan, Lili Wang, Junan Shen - Selecting warm mix asphalt additives by the properties of warm mix asphalt mixtures - China experience  (Vol X, No 1)

Vilnius Gediminas Technical UniversityRiga Technical UniversityTallinn University of TechnologyBaltic Road Association

 

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2015 Impact Factor: 0.519 ©2015 Thomson Reuters, 2015 Journal Citation Report®

ISSN 1822-427X print
ISSN 1822-4288 online
 

 

 
 

"The Baltic Journal of Road and Bridge Engineering"
Vilnius: Technika, 2015, Vol X, No 1, p. 79-88


Xinsheng Li, Zhaoxing Xie, Wenzhong Fan, Lili Wang, Junan Shen

Selecting warm mix asphalt additives by the properties of warm mix asphalt mixtures - China experience

DOI: 10.3846/bjrbe.2015.10
 
The objective of this research was to select the most effective warm asphalt additives for mix practice based on a series of laboratory testing programs such as density, Marshall stability, freeze-thaw splitting strength, dynamic stability, and bending beam strain. The experimental design of warm mix asphalt included the use of three commonlyused additives, two typical aggregate gradations, one crushed aggregate, and one modified asphalt. Results showed that: (1) the bulk specific gravity and air voids of all the mix specimens were similar to those of controls; (2) the Marshall stability and flow values of the warm stone mastic asphalt were 6.8%26.6% and 3.5%10.3%% higher than those of controls, respectively, and those of the warm asphalt concrete were 6.1%15.6% and 6.5%9.7% higher than those of controls, respectively; (3) the indirect tensile strength of two types of mixtures was 1.7%14.4% lower than that of controls, and the average tensile strength ratio of the warm stone mastic asphalt and asphalt concrete was 4.3% and 1.3% higher than that of controls, respectively; (4) the dynamic stability of warm mix specimens was 10.8%16.6% lower than that of the controls; (5) the average bending failure strain of warm stone mastic asphalt was 7.6% higher than that of the controls, and that of warm asphalt concrete was 12.8% lower than that of the controls; (6) Overall, warm asphalt mixtures with Sasobit and Rediset had relatively best performances required in Southeast China, where rutting and stripping are the main failures of asphalt pavements.
 
Keywords: warm mix asphalt, additives, aggregate gradation, properties, comparative investigation.

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