Influence of using nonmaterial to reduce the moisture susceptibility of hot mix asphalt

[rahmatii]

Influence of using nonmaterial to reduce the moisture susceptibility of hot
mix asphalt

 

F. Moghadas Nejad a , A.R. Azarhoosh b, GH.H. Hamedi a, M.J. Azarhoosh c
a Department of Civil & Environmental Engineering, Amirkabir University of Technology, Tehran 15875, Iran
b Department of Civil Engineering, University of Guilan, Rasht, Iran
c Department of Chemical Engineering, Amirkabir University of Technology, Tehran, Iran

 

a b s t r a c t
Moisture damage in an asphalt mixture can be defined as the loss of strength, stiffness and durability due to
the presence of moisture leading to adhesive failure at the binder–aggregate interface and/or cohesive failure
within the binder or binder–filler mastic. In order to improve adhesion and reduce moisture sensitivity
in asphalt mixtures, two different approaches have become apparent. One approach suggests that the aggregate
surface be coated by a suitable agent thatwill reverse the predominant electrical charges at the surface
and thus reduce the surface energy of the aggregate. In this study, the effects of nanomaterial, namely Zycosoil,
on the moisture damage of asphalt mixtures were studied.Two types of aggregates that represent a considerable
range in mineralogy, limestone and granite, were evaluated during the course of this study. To
assess the impact of Zycosoil on moisture damage of hot mix Asphalt, control mixes (without Zycosoil)
and mixes containing Zycosoil in dry and wet conditions were tested using indirect tensile-strength (ITS)
and indirect tensile fatigue (ITF) tests. The results showed that limestone has lessmoisture damage potential
compared to granite. The ratio of wet/dry values of ITST and ITFT for mixes containing Zycosoil was higher
than the control mix for two types of aggregate. However, in mixtures made of granite aggregate, using
Zycosoil ismore effective. As the density of silanol groups ismore in its surface, these groups are hydrophilic,
and Zycosoil migrates to the polar water-loving surface, reacts with the silanol groups and forms siloxane
bond, the strongest bond in nature, and creates a molecular level hydrophobic zone.
Crown Copyright 2012 Published by Elsevier Ltd. All rights reserved

 

Keywords
Moisture damage
Zycosoil
Indirect tensile-strength
Fatigue
Silanol group
Siloxane bond.

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