This study explores the effects of polyphosphoric acid (PPA) on rheological performance styrene butadiene (SBS) and crumb rubber (CR) modified asphalt binders at high temperatures. Four PPA concentrations were selected: 0.4%, 0.8%, 1.2%, 1.6% by weight virgin asphalt, one SBS binder with 5% was used as a reference binder. Laboratory tests performed to simulate short-term long-term aging. Temper...

With the rapid growth of traffic demands, use liquid chemical material instead traditional modifier to prepare high-performance modified asphalt demonstrates dual values in environmental protection and performance improvement pavement. The objective this study is assess efficiency reveal modification mechanism using a developed polyurethane precursor–based reactive (PRM) preparation precursor–m...

Asphalt paving is a specific type of construction work: the machines and materials constantly move while the asphalt mixture constantly cools down. The machine operators do have a clear goal – to provide an equally distributed and uniformly compacted asphalt layer in time-restricted conditions. But what does it mean in particular? In reality, the asphalt should be compacted to a certain degree ...

US transportation agencies have been increasingly using recycled asphalt shingles (RAS) in hot mix asphalt (HMA) applications over the last 25 years. Initial use of RAS started with recycled postmanufacturers shingles, but now agencies are showing a growing interest in using post-consumer (tear-off) RAS in asphalt applications. Post-consumer asphalt shingles typically have 20 to 30 percent asph...

US transportation agencies have been increasingly using recycled asphalt shingles (RAS) in hot mix asphalt (HMA) applications over the last 25 years. Initial use of RAS started with recycled postmanufacturers shingles, but now agencies are showing a growing interest in using post-consumer (tear-off) RAS in asphalt applications. Post-consumer asphalt shingles typically have 20 to 30 percent asph...