Document Type

Thesis - Open Access

Award Date

1985

Degree Name

Master of Science (MS)

Department

Civil Engineering

First Advisor

Ali A. Selim

Abstract

Among many factors affecting the quality of an asphaltic pavement, the bonding between the materials is one of the most important. These materials are aggregate and asphalt cement or emulsions, and each has certain physio-chemical characteristics. For example, natural aggregates and quartzites reveal sharp differences in appearances and texture. But besides their physical differences, they also have electrolytes which have opposite electric charges. However, because. asphalt cement and emulsion are both products of petroleum, when mixed with solvents they will vary in both physical and chemical behaviors. When hydrophilic aggregates such as quartzite and sandstone, both of which have negative electric charges, are used in the presence of asphalt cement, which also carries negative electric charges, it eventually leads to the breaking of the adhesive bond between the aggregate surface and the asphalt cement, a phenomenon known as “stripping” or “debonding”. However, if the surface electric charges of the aggregate could be altered, then theoretically it should reduce or eliminate the stripping of asphalt cement mixes containing quartzite. With this idea in mind, this research goes into details of the treatment of aggregates and/or emulsions with anti-stripping agents. Comparative studies were performed both in the laboratory and in the field. Ten test sections, each with duplicate strips of each treatment, were constructed on a major arterial. These sections were applied as treatments in the seal coat design. The purpose for building these samples were to examine the performance of the aggregates under traffic and to monitor the skid resistance periodically. One of the findings of this study was that quartzite, when used in asphaltic pavement, can resist traffic better than natural aggregates. Furthermore, a moisture-susceptibility test was developed in the laboratory to study the stripping potential of the samples utilizing antistripping agents at the presence of water, the conclusion was that adding quartzite to cationic emulsion resulted in the most optimal mix.

Library of Congress Subject Headings

Aggregates (Building materials)
Asphalt
Pavements -- Testing
Pavements -- Skid resistance

Format

application/pdf

Number of Pages

168

Publisher

South Dakota State University

Rights

No Copyright - United State
http://rightsstatements.org/vocab/NoC-US/1.0/

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