HMA Recycling
HMA is one of the most recycled products in the U.S. It is estimated that as much as 91 million tonnes (100 million tons) of HMA are milled off roads during resurfacing and widening projects each year...
View ArticleMix Selection Guidance
The National Asphalt Pavement Association (NAPA) has published some general rules Based for HMA mix type use, which are summarized in Table 1. Notice that dense-graded HMA is generally appropriate for...
View ArticleCold Plant Mix Recycling
AAPTP Project 05-01 Cold plant mix recycling, the less common of the two cold recycling methods, involves mixing RAP with an asphalt emulsion or foamed asphalt at a central or mobile plant facility. A...
View ArticleFull-Depth Reclamation
Although referred to as “full-depth reclamation”, this process is just an extension of the basic CIR principles to the entire HMA pavement depth plus a predetermined depth of the base material. FDR can...
View ArticleDense-Graded
A dense-graded mix is a well-graded HMA mixture intended for general use. When properly designed and constructed, a dense-graded mix is relatively impermeable. Dense-graded mixes are generally referred...
View ArticleOpen-Graded
An open-graded HMA mixture is designed to be water permeable (dense-graded and SMA mixes usually are not permeable). Open-graded mixes use only crushed stone (or gravel) and a small percentage of...
View ArticleStone Matrix Asphalt
Stone matrix asphalt (SMA) is a gap-graded HMA (Figure 1) that is designed to maximize deformation (rutting) resistance and durability by using a structural basis of stone-on-stone contact (Figures...
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