Author : Hasan H. Joni and Mahmood S. Hashim

Stripping is defined as the loss of adhesion between bitumen and aggregate. Replacement of bitumen film of the aggregate surface by water. It is one of the most commonly occurring distresses in asphalt pavements. Impacts of traffic loading, aggregate type, bitumen characteristics and properties of the additives. The main objective of this study is determining the effects of two different anti-stripping materials, namely hydrated lime and fly ash on cold bitumen emulsion mixture (CBEMs). Moisture susceptibilities of the samples were determined by Modified Lottman test (AASHTO T283), Index of retained strength, retained marshall stability, and double punch test. These tests were performed on mixes containing 1%, 1.5% and 2% of hydrated lime and mixes containing 1%, 2% and 3% of fly ash. The results specified that the addition of hydrated lime and fly ash increased moisture resistance of cold bitumen emulsion mixtures to some extent. Moreover, it was found that mix samples prepared using hydrated lime additive give greater resistance to water damage, compared with control mixes and those containing fly ash.

Keywords: Emulsified asphalt, Cold mix asphalt, Hydrated lime, Fly ash, Anti-stripping.

Article published in International Journal of Current Engineering and Technology, Vol.7, No.5 (Sept/Oct 2017)