Engineering Behavior of Warm Mix Asphalt Mixtures

Volume 3 - Issue 2

Peter E Sebaaly*, Elie Y Hajj and Murugaiyah Piratheepan

Received: January 16, 2019;   Published: January 28, 2019

DOI: 10.32474/TCEIA.2018.03.000158

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Abstract

This paper presents the results of an extensive research that evaluated the laboratory characteristics of hot and warm mix asphalt mixtures manufactured with 100% virgin materials and with 15 and 35% recycled asphalt pavement. The overall objective of the study was to evaluate the engineering properties and performance characteristics of the mixtures while the specific objective was to assess the ability of the warm mix additives in allowing the use of higher content of recycled asphalt pavement without changing the performance grade of the virgin binder.

All mixtures were designed with the Marshall mix design method. The engineering properties consisted of the dynamic modulus master curve while the performance characteristics covered the mixtures resistances to moisture damage, rutting, thermal and fatigue cracking. The analysis of the data led to the following conclusions: warm mix additives were effective in moderating the increase in the engineering property of the mixtures containing 15 and 35% recycled asphalt pavement as compared to the hot mixtures without significantly reducing their resistance to rutting and thermal cracking, however, the warm mix additives were not capable of maintaining good resistance to fatigue cracking, therefore, the idea of using warm mix additives to allow higher recycled pavement in the asphalt mix is not supported by the measured resistance of the mixture to fatigue cracking.

Keywords: Warm mix; Recycled asphalt pavement; Marshall mix design; Dynamic modulus; Moisture damage; Rutting; Thermal and fatigue cracking

Abstract| Introduction| Objective and Scope| Materials Characterization| Conclusion and Recommendations| References|