Resistance to Moisture-Induced Damage of Asphalt Mixtures and Aggregate-Binder Interfaces
The aggregate-asphalt binder adhesiveness is considerably affected by moisture. This property may accelerate distresses in asphalt pavement surface courses when aggregate-binder compatibility is not adequate. Numerous tests have been developed to measure this property, such as the Moisture-Induced Damage test (AASHTO T283) and the Asphalt Bond Strength test (AASTHO TP 91). The former measures the indirect tensile strength of dry and moisture-conditioned asphalt mixtures. The latter measures the tension stress needed to remove a pullout stub with asphalt binder from a solid substrate. Although these are distinct tests, both may be used as a means to analyze how moisture affects a certain combination of mineral aggregate and asphalt binder. The objective of this work is to correlate the results of these two tests and to analyze if the tested combinations of materials follow the same trend under both circumstances. Chemical compositions of the tested aggregates are also investigated. Results from Moisture-Induced Damage tests show that the use of an antistripping agent may reduce the impact of moisture-damage on tensile strength and that the aggregate with a higher content of calcium oxide performed better. The 12 h moisture conditioning in the Asphalt Bond Strength test had a strong correlation with the dry mixes, which was not noticed for the mixtures conditioned for 3 and 6 h. Asphalt mixture’s moisture sensitivity results correlated well to the loss of adhesion in the aggregate-binder interface.
KeywordsAdhesion Moisture-induced damage Asphalt Bond Strength Chemical composition
The authors thank Fundação Cearense de Apoio ao Desenvolvimento Científico e Tecnológico – FUNCAP and Brazilian Federal Agency for Post-graduate Education (CAPES).
- AASHTO TP 91-11: Test Designation: Determining Asphalt Binder Bond Strength by Means of the Asphalt Bond Strength (ABS) Test. AASTHO (2013)Google Scholar
- AASHTO T283: Standard method of test for resistance of compacted asphalt mixtures to moisture-induced damage. Washington, DC (2014)Google Scholar
- Chaturabong, P., Bahia, H.U.: Effect of moisture on the cohesion of asphalt mastics and bonding with surface of aggregates. Road Materials and Pavement Design (2016)Google Scholar
- Hicks, R.G.: Moisture damage in asphalt concrete. NCHRRP. Synthesis of Highway Practice 175, Transportation Research Board, Washington (1991)Google Scholar
- Kanitpong, K., Bahia, H.U.: Relating adhesion and cohesion of asphalts to the effect of moisture on laboratory performance of asphalt mixtures. Transp. Res. Rec. J Transp. Res. Board 1901, 33–43 (2005). https://doi.org/10.3141/1901-05. National Research Council, Washington, D.C.CrossRefGoogle Scholar