Mechanistic, Environmental, and Economic Analysis of WMA Technologies in Louisiana

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Conference Proceeding

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Warm mix asphalt (WMA) describes various technologies that allow asphalt mixtures to be produced at lower temperatures as compared to hot mix asphalt (HMA). The objective of this study was first to evaluate the laboratory performance of plant-produced lab-compacted mixtures utilizing various WMA technologies and to compare WMA energy consumption cost and emission data to conventional HMA mixtures in terms of fuel/energy savings at the plant and in terms of CO and CO2 emissions. Three projects in Louisiana utilizing four different WMA technologies were considered in this study. Laboratory tests included dynamic modulus (|E∗|), flow number (FN), loaded wheel tracking (LWT) test, indirect tensile (IDT) test, semi-circular bend (SCB) test, thermal stress restrained specimen test (TSRST), and the Lottman moisture susceptibility test. Results indicated similar high and intermediate temperature performances. On average, $1.61 of energy savings per ton of produced asphalt mixture was observed, along with a considerable reduction in air pollutants at the plant. However, the cost of additives and royalty fees would reduce the total cost savings from using WMA.

Publication Source (Journal or Book title)

Construction Research Congress 2016: Old and New Construction Technologies Converge in Historic San Juan - Proceedings of the 2016 Construction Research Congress, CRC 2016

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