Moisture Damage Evaluation of Asphalt Mixtures depending on the Types of Anti-Stripping Agent

Abstract

PURPOSES :The objective of this study is to analyze the performance of anti-stripping agent depending on its type and content to reduce pothole, an increasing pavement distress due to abnormal climate intensity. METHODS :In the past years, U.S and many countries in Europe use hydrated lime and liquid anti-stripping agent in asphalt mixtures.Hydrated lime or liquid anti-stripping agent is substituted for filler and binder, respectively, to improve the anti-stripping property of asphalt mixtures. To investigate this, indirect tensile strength test was performed and TSR values were compared for different content of hydrated lime and types of liquid anti-stripping agent in asphalt mixture. RESULTS :Test results indicate that hydrated lime remarkably increased the asphalt mixture performance on anti-stripping denoted by the increased in TSR values from 55% to 100%. Liquid anti-stripping agent also increased the value of TSR but not significant. In addition, depending on the types of aggregate, TSR values and effect of liquid anti-stripping were different. CONCLUSIONS :Using anti-stripping agents improve the anti-stripping property of asphalt mixture especially hydrated lime; however, more experiments should be conducted to improve the reliability about the effect of liquid anti-stripping agent.

Zeta Potential of Aggregate and Dynamic Modulus of HMA Estimation Using Aggregate Silica Content

“…Several studies have been done on the impact of the zeta potential on the properties of bituminous materials. For example, studies carried out by Korean Society of Transportation [1] on stripping of asphalt pavements and antistripping addities showed that aggregates which had relatively higher surface potential in water and/or which imparted relatively higher pH to the contacting water were more susceptible to stripping. The zeta potential can be positive or negative, it will depend on the stability of the suspended particles [2] [3] [4].…”