Mechanistic Evaluation of Hedmanite and Lime Modified Asphalt Concrete Mixtures
Publication: Journal of Materials in Civil Engineering
Volume 10, Issue 3
Abstract
This investigation was undertaken to evaluate the effectiveness of using hedmanite (rockwool natural fibers) as filler in improving the performance of asphalt concrete pavements, and to compare hedmanite with lime (as filler) modified mixes and the conventional asphalt mix containing crushed stone filler. In this study, optimum asphalt content was obtained by Marshall method and was used in all the modified mixes. The engineering properties, including resilient modulus, stability loss, split tensile strength, fatigue and permanent deformation, were determined. Results indicated that certain percentages of both hedmanite and lime are effective in improving the resilient modulus, while the Marshall stability loss and tensile strength loss were higher in hedmanite mixes than in lime mixes. Lime modified mixes showed better resistance to fatigue and rutting than hedmanite modified mixes. Results indicated that better quality asphalt concrete mixes can be prepared using lime rather than hedmanite as a filler.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 10 • Issue 3 • August 1998
Pages: 153 - 160
Copyright
Copyright © 1998 American Society of Civil Engineers.
History
Published online: Aug 1, 1998
Published in print: Aug 1998
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