Abstract
AbstractIn recent years, a new group of technologies has been introduced in the United States that allow producing asphalt mixtures at temperatures 30 to 100°F (16.7–55.6°C) lower than what is used in traditional hot-mix asphalt (HMA). These technologies are commonly referred to as warm-mix asphalt (WMA). From among these technologies, foamed WMA produced by water injection has gained increased attention from the asphalt paving industry in Ohio since it does not require using costly additives. This type of asphalt mixture is advertised to have better workability than traditional HMA mixtures. However, limited research has been conducted to validate this claim. In this study, a new device was designed and fabricated to evaluate the workability of foamed WMA mixtures and compare it to that of HMA mixtures. Two asphalt binders (PG 70-22 and PG 64-28), two aggregate types (limestone and crushed gravel), and two nominal maximum aggregate sizes (12.5 and 19.0 mm) were used in this study. The test results showed...
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