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Laboratory Compaction Study and Mechanical Performance Assessment of Half-Warm Mix Recycled Asphalt Mixtures Containing 100% RAP

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Department of Pavements, Sacyr Construction, Pº de la Castellana, 83-85, 28046 Madrid, Spain
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Department of Transport Engineering, Urban and Regional Planning, Technical University of Madrid (UPM), C/Profesor Aranguren s/n, 28040 Madrid, Spain
*
Author to whom correspondence should be addressed.
Materials 2019, 12(12), 1992; https://doi.org/10.3390/ma12121992
Received: 22 May 2019 / Revised: 17 June 2019 / Accepted: 18 June 2019 / Published: 21 June 2019
The use of low-carbon and energy-efficient paving technologies is gaining worldwide acceptance in recent years as a means to encourage commitment towards more sustainable pavement management practices. However, there still remain some technical gaps regarding mix design procedures for the half-warm mix asphalt (HWMA) mixtures’ preparation and characterization in the laboratory. To this end, three different laboratory compaction methods (e.g., static load, Marshall impactor, and gyratory compactor) were selected and put into assessment to define the most suitable compaction test method for half-warm mix recycled asphalt (HWMRA) mixtures with 100% reclaimed asphalt pavement (RAP). Posteriorly, the effect of four-accelerated curing treatments (0, 24, 48, and 72 h) on the mixtures’ mechanical performance was investigated. Then, advanced mechanical characterization of the mixture performance was conducted to quantify the indirect tensile strength (ITS), stiffness modulus, rutting, and four-point bending (4PB) fatigue test. Thus, based on the authors’ findings, the HWMRA mixtures with 100% RAP and emulsified bitumen exhibited proper volumetric (e.g., air voids and density) and mechanical behavior in terms of moisture damage, ITS, stiffness modulus, rutting, and fatigue cracking. These findings encourage greater confidence in promoting the use of these sustainable asphalt mixes for their use in road pavements or urban streets. View Full-Text
Keywords: half-warm mix recycled asphalt mixtures; 100% recycling; curing treatment; stiffness modulus; rutting; fatigue half-warm mix recycled asphalt mixtures; 100% recycling; curing treatment; stiffness modulus; rutting; fatigue
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MDPI and ACS Style

Marcobal, J.; Lizárraga, J.; Gallego, J. Laboratory Compaction Study and Mechanical Performance Assessment of Half-Warm Mix Recycled Asphalt Mixtures Containing 100% RAP. Materials 2019, 12, 1992.

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