Investigating the Effect of Characteristics of Aggregates and SFE components of Asphalt Binder-Aggregate on the Moisture Sensitivity of Asphalt Mixtures Modified with Anti-Stripping Agents

Document Type : Research Article

Authors

1 Faculty of Engineering, Urmia University, Urmia, Iran

2 Faculty of Civil Engineering, Urmia University, Urmia

3 Department of Civil Engineering, Faculty of Engineering, University of Guilan, Rasht, Iran

Abstract

One of the most common failures that occur during the life of asphalt pavements is moisture damage. The penetration of water between asphalt binder and aggregate causes the gradual separation of asphalt binder from aggregates and the weakening of the bonding force between asphalt binder and aggregates. With the expansion of this type of failure, the durability and asphalt mix resistance decreases. Moisture damage is defined as loss of strength and durability in asphalt mixtures. Many studies have been done on the use of anti-stripping additives to improve the quality of asphalt mixtures against the moisture damage in asphalt mixtures using surface free energy and mechanical test. One of the ways to improve the performance of asphalt mixes against moisture damage is the use of anti-stripping materials, which are usually used with hydrated lime or liquid anti-stripping agents. The use of these materials with a number of technical problems. In this research, it has been tried to investigate the effect of nanomaterials and liquid anti-stripping materials on the basis of mechanical and thermodynamic methods. 24 different types of asphalt mixtures have been investigated using three types of aggregates, two types of base asphalt binder and three types of additives. Asphalt binder and aggregate surface free energy components are measured by Sessile drop method and Universal sorption device and the ratio of fatigue life of asphalt mixtures through indirect tensile strength test. The results of this study indicate that the use of nanomaterials and liquid anti-stripping improves strength of asphalt mixtures against the moisture. Also, using these additives will increase the fatigue life and tensile strength of the asphalt mixture. Increasing in the fatigue life ratio was between 2-9%. The increase in fatigue life in wet conditions has been between 10-22%. Additionally, nanomaterial additives have a positive effect on the surface free energy components of asphalt binder, the surface free energy of aggregates, the free energy of adhesion between asphalt binder-aggregate, the debonding energy of asphalt binder and aggregates, and the cohesion free energy of asphalt binders, and improve the performance of these structures against moisture damage.

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References

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Amirkabir Journal of Civil Engineering
Volume 52, Issue 8
November 2020
Pages 2109-2128

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