Md Arifuzzaman* Pages 109 - 113 ( 5 )
Background: This paper addresses the moisture sensitivity of Elvaloy-Modified Asphalt (EMA) in the presence of lime using Atomic Force Microscopy (AFM). The performance of three different lime percentages was evaluated for three different levels of EMA. The lime-modified EMA was conditioned for dry and wet environments and finally tested using AFM. All the AFM tests were performed using functional groups of asphalt binder: ammin (NH3), methyl (CH3), carboxyl (COOH), and hydroxyl (OH). Differences of adhesion/cohesion forces for dry and wet samples indicated nano-scale moisture damage.
Conclusion: The study found that an increase in percentage of lime from 0.5% results in incremental damage due to moisture. Similarly, for a specific percentage of lime, moisture damage decreases with increased percentage of elvaloy. The use of 0.5% lime with 1.5% EMA outperforms all other combinations in resisting moisture damage and is proposed as the recommended dose for practical purposes.
AFM, asphalt binder, elvaloy, lime agent, moisture damage, ASA.
Department of Civil Engineering, University of Bahrain, Isa Town Campus