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

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ASPHALT RUBBER AND THE USE OF CRUMB RUBBER IN ASPHALT APPLICATIONS Presentation by: David Verdugo Ab lf l R h d 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 materials that are were not biodegradable. E l i i d Early experiments incorporated waste tires in: In cement kilns (Energy Use) Crumb rubber (Recycling use)
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A SPHALT R UBBER H ISTORY During the 1960’s there was a major discovery in th fi ld f h lt bb the field of asphalt rubber: Asphalt is absorbed by the rubber particles which expand in size. This happens at high temperatures temperatures.
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A SPHALT R UBBER H ISTORY In 1975, the first crumb rubber paving asphalt i t d i d d mixture was designed and was successfully: Charles H. McDonald experimented with the addition of synthetic ground tire rubber into chip seal applications chip seal applications.
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A SPHALT R UBBER H ISTORY In 1988, The American Society for Testing and M t i l (ASTM) Materials (ASTM): Defined the name asphalt rubber Gave simple instructions as to create a mix that is stable 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 th h h th t R through research that R- A’s: •Properties equate to reduced cracking. •Reduced rutting •Greater safety and noise reduction
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A SPHALT R UBBER D ESIGN COMPONENTS Crumb Rubber A h lt C t 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 applications like chip sealing Type 2 or Grade B- 14 to 20 mesh, used for spray applied applications and 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) Type 3: Cold Climate PG 52 28 (AC 5) PG 52-28 (AC-5)
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A SPHALT R UBBER D ESIGN ADDITIVES 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 Anti-stripping agents - used to increase or improve adhesion. Anti stripping agents used to increase or improve adhesion. High natural rubber - used to improve adhesion and flexibility. Polymers
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A SPHALT R UBBER D ESIGN ASPHALT RUBBER BLEND DESIGN PROFILE A design profile is typically developed to evaluate the compatibility between materials used, component interaction and to check for stability of blend over time.
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