Abstract
In recent years, a new approach called WMA technology is developed, which include reduces binder viscosity and accordinglyallows lower temperatures for mixing and compaction. This technology gives several benefits, such as reduce emission, less odor,and energy saving. This study gives a comprehensive review on the use of WMA with chemical technology. In addition, give anintroduction to use chemical additives into the bitumen, in order to understand the application of these additives, the problems,benefits and how they act are reviewed.
Highlights
Warm mix asphalt (WMA) is a new technique widely utilized in highway industry; it provides energy saving and environmental friendly technology
The Authors showed that when a bitumen is modified with chemical WMA, an increase in fatigue resistance will happen at medium temperatures, because through rheological tests, a decrease in G*/sin (δ) values was apparent
Reference [46] tested warm mixes with different additives, they reported that WMA mixes had similar rutting characteristics to HMA, which indicates that these products do not stiffen or soften the binder
Summary
Warm mix asphalt (WMA) is a new technique widely utilized in highway industry; it provides energy saving and environmental friendly technology. This technology reduces energy consumption, emissions due to a reduction by 25–30°C in temperature of mixing and compaction [1,2]. Many contractors implementing warm mix asphalt (WMA) technology in order to reduce fuel consumption and improve workability [3]. The economic value is identified by fuel saving, reduce in roller passes and long haul distances. A technology was developed to produce WMA from chemical products, in order that reduce construction temperature, pollution emissions, and to increase of carrying asphalt for long distances. Some of the chemical additives are available as an emulsification agent [8,6,9] when mixing it with aggregate, the water will flash off as steam, and will enhance the coating
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