Evaluation of moisture sensitivity of asphalt mixtures modified with nanoparticle (zinc and silicon oxides)

Document Type : Research Article

Authors

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

2 Department of Civil Engineering, Faculty of Engineering, Ismalic Azad University, Branch of Ahar, Ahar, Iran

Abstract

Moisture damage is one of the most common distresses in asphalt mixtures due to the effect of moisture on asphalt binder and asphalt binder-aggregate adhesion. There are different ways to improve adhesion and reduce moisture damage in asphalt mixtures. One of the most common ways to reduce moisture damage is to use asphalt binder modification with an additive. In this research, the effect of two types of nanomaterials (nano zinc and silicon oxides) in two different percentages as additive to asphalt binder, two types of aggregate (granite and limestone) and a type of asphalt binder are studied. To investigate the effect of nanomaterials on reducing the moisture damage of asphalt mixtures, indirect loading of cyclic loading in dry and wet conditions as a mechanical method and surface free energy method has been used as a thermodynamic method. The moisture sensitivity index, the percentage of aggregate surface stripped in loading cycles using the results of surface free energy and indirect loading, are derived based on the results of mechanical and thermodynamic experiments. The mechanical test results used in this study indicate that nanomaterials have significantly improved the strength of asphalt mixtures compared to control samples. The results of the surface free energy method indicate that the surface free energy of cohesion of nanomaterial increases. This will reduce the risk of failure in the asphalt binder film. Also, nanomaterials increase and decrease basic and acidic surface free energy components of asphalt binders, which improves the bonding of asphalt binder to acidic aggregates that are susceptible to moisture damage.

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References

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Amirkabir Journal of Civil Engineering
Volume 52, Issue 5
August 2020
Pages 1243-1264

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