While there are an infinite number of questions that can be asked, we compiled a list of those questions that have been directed to us the most. These FAQs are categorized into the 12 subject areas shown below. We tried to keep both the questions and answers concise. Additional information related to the question and answer can be found in the references provided at the end of the answer.
We tried to keep both the questions and answers concise. Additional information is referenced where applicable for those seeking more in-depth information on a given subject.
For further information see the Superpave Documents, other engineering areas, Asphalt magazine and APA websites, Asphalt Institute online store and the links page for other information related to these topic area.
We also recommend that you attend our Asphalt Academy courses at sites throughout the country to obtain expert instruction on asphalt topics.
|Q:||Can the same paving equipment be used for Superpave mixes that was used for conventional mixes?|
|A:||Yes. However, since Superpave mixes tend to be coarser and contain modified binders more often than conventional mixes, good construction practices are more important than ever. Segregation is more likely to occur with coarser mixes if proper equipment and techniques are not used. Density can also be more difficult to achieve with Superpave mixes. Proper rolling techniques and adequate equipment are essential to achieve sufficient compaction. Breakdown rolling for Superpave mixes is normally done right behind the paver when the mix is hottest. Some contractors have found that additional and/or heavier rollers are sometimes needed. Pneumatic rubber-tired rollers work well, but tend to stick to the mat when polymer modified asphalt is used.Hand-working should be minimized. Sufficient well-graded (not segregated) material should be supplied by the paver augers to the joint to facilitate a low-voids, low-permeability seam.|