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Design of Toner Modifications for the Houston, Laredo, Pharr, and Bryan Demonstration Projects
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2004-03-01
[PDF-483.67 KB]
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Abstract:This report includes the binder designs for the Houston, Laredo, Pharr and Bryan Toner Projects where waste toner was used as an asphalt binder modifier. For each of these projects, a binder design was performed, including blending time, performance grading, storage stability, and mixing and compaction temperature calculation. The PG properties of the toner-modified asphalt binders used in each test section varied according to the amount of polymers in the toner. Objectives of the research included determining the toner levels needed to arrive at a given PG grade, as well as a better understanding of the effect of toner level on the PG properties of a binder. Test results indicate that the stiffness of the blend increases at all temperatures as the percentage of the toner content present increases. This stiffening effect is more pronounced when the level of toner content is at higher levels. Results also show that two hours of blending time is sufficient to achieve a homogeneous toner-asphalt mix; significant storage stability problems are expected regardless of the level of toner in the blend; and mixing and compaction temperatures stay at reasonable levels.
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