Evaluation of Use of Synthetic Lightweight Aggregate in Hot-Mix Asphalt

Author:

Mallick Rajib B.1,Hooper Frederick P.2,O'Brien Sean1,Kashi Mohsen3

Affiliation:

1. Civil and Environmental Engineering Department, Worcester Polytechnic Institute, Worcester, MA 01609

2. Materials Technology Center, Geo Testing Express, Inc., 1145 Massachusetts Avenue, Boxborough, MA 01719

3. DMJM Harris, 66 Long Wharf, 2nd Floor, Boston MA 02110

Abstract

Successful use of synthetic lightweight aggregates made from waste fly ash and plastics can help in conserving mineral aggregates and reusing waste materials. The objective of this study was to evaluate the use of synthetic lightweight aggregate made from waste fly ash and plastics in hot-mix asphalt. The scope of this laboratory study included preparation of aggregate blends and mixes with different percentages of synthetic lightweight aggregates, compaction of samples, testing of samples, and analysis of results. Mixes were made with 0%, 5%, 10%, 15%, and 20% synthetic lightweight aggregates by weight of aggregates. Tests included bulk specific gravity, theoretical maximum density, resilient modulus, and indirect tensile strength at 25°C on unconditioned and conditioned samples as well as rut testing with wheel tracking equipment at 60°C. Test results were analyzed statistically to determine the effect of synthetic lightweight aggregates on hot-mix asphalt properties. The results indicate that the inclusion of synthetic lightweight aggregates enhances stiffness and resistance against rutting and moisture-induced damage of hot-mix asphalt. A relatively high absorption was noted for mixes containing 20% synthetic lightweight aggregates. The main conclusions are that synthetic lightweight aggregate has excellent potential for being used as part of hot-mix asphalt, and 15% by weight of aggregate appears to be an optimum amount for use. Further work should be pursued to determine the effect of synthetic lightweight aggregate on low-temperature properties of hot-mix asphalt.

Publisher

SAGE Publications

Subject

Mechanical Engineering,Civil and Structural Engineering

Reference10 articles.

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