Chemistry of Asphalt-Aggregate Interaction in Pavements
Understanding the chemistry of asphalt-aggregate interaction is crucial in preventing stripping in asphalt pavements. This involves the adhesion process, the role of acidic compounds, and the properties of aggregates and asphalt. Learn about effective bonding and potential issues to maintain pavement quality.
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Presentation Transcript
First Stage Lecture 12 Lecture. Rana Amir Yousif Lecture. SadyAbd Tayh Highway and Transportation Engineering Mustansiriyah University 2018-2019
References: Edwin J. Barth. Asphalt Science and Technology , 1st Ed. ,1962. James Speight Asphalt Materials Science and Technology , 1st Edition 2015.
Chemistry ofAsphaltAggregate Interaction Stripping inAsphalt Pavements: It is the breaking of the bond between aggregate and asphalt by the action of water. Stripping due to lack of chemical interaction between asphalt and aggregate / bonding (Adhesion). It is a surface fenomenon.
Adhesion: The process of forming chemical bond between the asphalt film and the aggregate surface. ActiveAdhesion: Coating and formation of chemical bond in the presence of water. Presence Presence of acidic organic compounds in asphalts Carboxylic acids (RCOOH) and anhydrides. Acid value (0 to 4 mg KOH/g). Possible presence of compounds related to naphthenic acids.
Aggregate and asphalt properties: : Aggregates with a high CaCO3 content with not pass polish test. Fines are siliceous material (sadn) and the stripping in the fines is more of a problem.
Interaction of alkaline aggregates and asphalt with acidic compounds: Stripping may occur when there is coating without chemical bonding.
