Asphalt Rubber - ASPHALT RUBBER AND THE USE OF CRUMB RUBBER...

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SPHALT RUBBER AND THE ASPHALT RUBBER AND THE USE OF CRUMB RUBBER IN ASPHALT APPLICATIONS Presentation by: David Verdugo Abolfazl Ravanshad
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A SPHALT R UBBER H ISTORY During the 1950’s a growing movement was developing in social centers which pushed for the research of new ways to dispose of aterials that are were not materials that are were not biodegradable. Early experiments incorporated waste tires in: In cement kilns (Energy Use) Crumb rubber (Recycling use) (yg )
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A SPHALT R UBBER H ISTORY During the 1960’s there was a major discovery in the field of asphalt rubber: Asphalt is absorbed by the rubber particles which expand in size. This happens at high mperatures temperatures.
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A SPHALT R UBBER H ISTORY In 1975, the first crumb rubber paving asphalt mixture was designed and was successfully: Charles H. McDonald experimented with the addition of synthetic ground tire rubber into ip seal applications chip seal applications.
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A SPHALT R UBBER H ISTORY In 1988, The American Society for Testing and Materials (ASTM): Defined the name asphalt rubber Gave simple instructions as to create a mix that is table and durable stable and durable.
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A SPHALT R UBBER H ISTORY In the 1990’s the ARMY corps of Engineers proved through research that R- A’s: •Properties equate to reduced cracking. •Reduced rutting •Greater safety and noise duction reduction
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A SPHALT R UBBER D ESIGN COMPONENTS Crumb Rubber Asphalt Cement Additives
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A SPHALT R UBBER D ESIGN CRUMB RUBBER variety of grades and designations presented by particular size and/or source. Crumb Rubber Grades Type 1 or Grade A- Coarse CRM, 10 mesh, usually for spray applied pplications like chip aling applications like chip sealing Type 2 or Grade B- 14 to 20 mesh, used for spray applied applications and ot mix design for both moderate nd cold climates hot mix design for both moderate and cold climates Type 3- 30 mesh, used for hot mix design in extreme cold climate regions Note: Mesh size designation refers to the first sieve with an upper range specification between 5.0 & 10.0 percent retained.
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A SPHALT R UBBER D ESIGN ASPHALT CEMENTS USED FOR ASPHALT RUBBER BINDER Type 1: Hot Climate PG 64-16 (AC-20) Type 2: Moderate Climate PG 58-22 (AC-10) ype 3: Cold Climate G 2 8 (AC ) Type 3: Cold Climate PG 52-28 (AC-5)
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A SPHALT R UBBER D ESIGN ADDITIVES sed njunction ith umb bber id r elp roduce Used in conjunction with crumb rubber to aid or help produce a desirable property Some additives include: Extender oils - aid in the reaction of the crumb rubber, and help with dispersion nti- tripping gents - sed crease r prove dhesion Anti stripping agents used to increase or improve adhesion.
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This note was uploaded on 05/26/2011 for the course CGN 6505 taught by Professor Mang during the Spring '11 term at University of Florida.

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Asphalt Rubber - ASPHALT RUBBER AND THE USE OF CRUMB RUBBER...

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