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Performance Evaluation of Lime in Resisting Moisture Damage in Elvaloy-Modified Asphalt

[ Vol. 3 , Issue. 2 ]

Author(s):

Md Arifuzzaman*   Pages 109 - 113 ( 5 )

Abstract:


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.

Keywords:

AFM, asphalt binder, elvaloy, lime agent, moisture damage, ASA.

Affiliation:

Department of Civil Engineering, University of Bahrain, Isa Town Campus

Graphical Abstract:



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