Laboratory Evaluation of Organic and Chemical Warm Mix Asphalt Technologies for SMA Asphalt

Authors

  • Martins Zaumanis Dept of Transportation, Riga Technical University, Āzenes street 16/20, LV-1048 Riga, Latvia
  • Eric Olesen Danish Road Institute, Guldalderen 12, DK-2640 Hedehusene, Denmark
  • Viktors Haritonovs Dept of Transportation, Riga Technical University, Āzenes street 16/20, LV-1048 Riga, Latvia
  • Guntis Brencis Dept of Transportation, Riga Technical University, Āzenes street 16/20, LV-1048 Riga, Latvia
  • Juris Smirnovs Dept of Transportation, Riga Technical University, Āzenes street 16/20, LV-1048 Riga, Latvia

DOI:

https://doi.org/10.3846/bjrbe.2012.26

Keywords:

warm mix asphalt, bitumen rheology, stiffness, aging, permanent deformations

Abstract

Warm mix asphalt (WMA) technologies allow significant lowering of the production and paving temperature of the conventional hot mix asphalt (HMA), which promise various benefits, e.g. lowering the greenhouse gas emissions, reduction of energy consumption, improved working conditions, better workability and compaction, etc. However, in order to reach widespread implementation of WMA, it is necessary to prove that it has the same or better mechanical characteristics and long-term performance as HMA. This article presents a laboratory study that has been conducted to evaluate two different WMA technologies – chemical (using Rediset WMX) and organic (using Sasobit) for the use with stone matrix asphalt (SMA). The properties of two types of bitumen after modification with two different dosages of each WMA additive have been tested by traditional empirical test methods and with the Dynamic Shear Rheometer for a wide temperature range. Asphalt testing has been performed for SMA11 type mixture. At first, the necessary changes in testing conditions were determined by means of asphalt stiffness – the results suggested that for adequate comparison with reference HMA, at least two hour asphalt aging is essential before preparing test specimens. The properties of asphalt were determined for specimens that were prepared at four different compaction temperatures by means of two compaction methods – Marshall hammer and gyratory compactor. The test results show that it is possible to reduce the compaction temperature of 155 °C for HMA to at least 125 °C for both WMA products with maintaining similar density and mechanical characteristics at intermediate to high temperatures.

References

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Published

27.09.2012

How to Cite

Zaumanis, M., Olesen, E., Haritonovs, V., Brencis, G., & Smirnovs, J. (2012). Laboratory Evaluation of Organic and Chemical Warm Mix Asphalt Technologies for SMA Asphalt. The Baltic Journal of Road and Bridge Engineering, 7(3), 191-197. https://doi.org/10.3846/bjrbe.2012.26