Abstract
Moisture damage in asphaltic mixtures is defined by the loss of durability and resistance caused by the effect of moisture. The most common way to improve moisture damage in asphaltic mixtures is to use anti-strip additives. This study tended to use dry resin polymer additive to make a moisture-resistant asphaltic mixture. Two types of aggregate indicating different sensitivities against moisture were studied. In order to compare the effect of this material with other anti-strip additives, this study evaluated the effect of hydrated lime on reducing moisture damage and comparing its effect with dry resin polymer additive. The effect of these materials was evaluated by mechanical and thermodynamic concepts using indirect tensile ratio and surface free energy. The results indicated that dry resin polymer used in this study increased alkaline content and reduced acidic content of bituminous surface free energy, resulting in more adhesion between acidic aggregates which are more sensitive to resistance. It also improved bitumen-aggregate adhesion and reduced strip rate. Moreover, hydrated lime as an aggregate anti-strip agent and dry resin polymer as a bituminous modifier significantly increased the resistance of warm asphalt mixtures against moisture. The results of this study show that dry resin polymer can be used as an anti-strip agent instead of hydrated lime with operational problems.
Highlights
The best way to improve roads is not to spend more on them, but to improve the design, construction and maintenance of roads
Moisture Sensitivity Test in Specimens Modified with Dry Resin Polymer Moisture Sensitivity Test by AASHTO T283: The results of indirect tensile strength of specimens in different ice-melt cycles are shown in Figures 2 and 3
It can be concluded from the data presented in these two figures that addition of dry resin polymer as an anti-striping agent increases adhesion and bonding in the mixture and does not allow rapid displacement of bitumen on aggregate surfaces, which results in higher resistance of the mixture to moisture following ice-melt cycles than specimens without dry resin polymer additives
Summary
The best way to improve roads is not to spend more on them, but to improve the design, construction and maintenance of roads. Most of the cost of asphalt stone aggregates is not followed by a good result due to moisture problems. Degradation of asphalt compounds by moisture can be defined by early loss of strength and durability due to moisture penetration in asphalt mixture and rock materials. As a result of construction and maintenance costs and low useful life of asphalt pavements, in wet and humid areas, efforts have been made to produce moisture resistant asphalt mixtures. Many road organizations have made extensive efforts to reduce costs of pavement maintenance. One of the damages which cause excessive costs in asphalt pavements is moisture damage [1]
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