Florida s Experience with Crumb Rubber
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1 Florida s Experience with Crumb Rubber Jim Warren Executive Director Asphalt Contractors Association of Florida, Inc. Slides Courtesy of FDOT State Materials Office
2 Background Implementation Specifications FL GTR Topics Quality Control/Acceptance Applications Performance Usage Successes/Challenges New Changes
3 1988 State of Florida Legislation Comprehensive solid waste legislation Established County Solid Waste Authorities Directed state agencies to increase use of recycled products Florida DOT Recycled plastics (fence posts) Motor oil Ground tire rubber
4 Implementation Activities Research FDOT in-house University of Florida NCAT State of the Art Report Constructed Experimental Projects Identified potential Uses: 2 HMA applications 1 SAMI application Emissions study Emission and Worker exposure levels
5 Implementation Implementation Constructed Demonstration projects Implemented on all projects January 1994
6 Specifications Ground Tire Rubber 20, 40 & 80 mesh Binder Types ARB-5 (5% GTR) ARB-12 (12% GTR) ARB-20 (20% GTR) Applications Open-graded friction courses Dense-graded friction courses Asphalt Rubber Stress Absorbing Membrane Interlayer
7 GTR Specifications Physical requirements Chemical requirements Must be produced from ambient grinding methods Better surface texture Gradation
8 Typical Tire Grinding Process
9 Asphalt Rubber Binder Specification Recipe specification: Amount of GTR Type of binder GTR size Reaction temperature Reaction time Minimum viscosity
10 Asphalt Rubber Binder Specifications
11 Asphalt Rubber Blenders Lake City Jacksonville Orlando Pensacola Tampa Ft. Lauderdale Terminal Blending Facility Portable Blending Facility Tire Grinding Facility
12 Open-Graded Friction Courses All high speed, multi-lane roadways Minimize hydroplaning FC-5 ARB-12 Polish resistant aggregate Stabilizing fibers (mineral or cellulose) Placed ¾ thick Improve durability Minimize raveling Increased binder content Less Construction draindown Increased film thickness
13 FC-5 Nassau County US-441 Alachua County
14 Open Graded Friction Course - FC 5
15 Raveling OGFC I-75 Marion County
16 Dense Graded Friction Courses FC-9.5, FC-12.5 Superpave mixes ARB-5 Fine graded mixes Polish resistant aggregate Improve rutting resistance Increased binder stiffness (PG 70-22)
17 Dense Graded Friction Course SR-121 Alachua County
18 Asphalt Rubber Membrane Interlayer (ARMI) Asphalt Rubber Stress Absorbing Membrane Interlayer (SAMI) Used to prevent moisture intrusion and reflective cracking Used over milled asphalt surfaces and cracked & seated concrete pavements
19 Asphalt Rubber Membrane Interlayer ARB-20 PG % GTR (20 Mesh) Application Rate: gal/sy Cover material: No. 6 Stone One aggregate layer thick
20 Application of ARB-20 Application Rate gal/sy
21 Chip Spreader
22
23 I-10 Gadsden County
24 OGFC 9.5 mm Superpave 19.0 mm Superpave ARMI I-10 Suwannee County
25 Quality Control/Acceptance Requirements Minimum viscosity requirement Incoming shipments Storage tank Dip-N-Read rotational viscosimeter
26 Performance Improved short-term raveling performance of OGFC Improved cracking resistance of OGFC Unexpected benefit Improved rutting resistance FDOT APA study Relatively minor
27 SR-16 Bradford County With ARB Without ARB
28 APA Rutting Study
29 Florida 2010 Census: million people Generating Annually: - 15 Million automobile tires - 900,000 truck tires Million Passenger Tire Equivalents (PTE s)
30 19.5 Million PTEs Usage
31 2011/2012 Usage Unmodified Asphalts 33% 100,440 tons (liquid) PG and 4 Recycling Agents Polymer Modified Asphalt 51% 159,582 tons (liquid) PG Asphalt Rubber 16% 49,925 tons (liquid) ARB-5, ARB-12, ARB-20
32 Why has Florida s Program been Successful? Lower rubber percentages Minimal impact on production operations Minor equipment changes Minimal impact on paving operations Increased laydown temperatures Supplier terminal blending Constant market FDOT/Industry cooperation
33 Challenges Short Term Storage Long Term Storage Settlement Multiple Binders / Limited Tankage Handling Heavy Binders Mix Properties
34 Current Status FDOT using more PG with SBS polymers Used on all high volume roadways Reduction in GTR usage Continue to use asphalt rubber on all other facilities Joint Task Group: Improve & use GTR Evaluating hybrid binders for last year Considering a PG w/gtr Minimum GTR content ARMI research and rutting FDOT committed to using GTR!
35 New GTR Changes for July 13 PG76-22R: replaces ARB-5 & ARB-12 Min of 7.0% GTR Phase angle: Max 75 o C Polymer optional: SBS or SB Waived solubility DSR 2mm gap Separation Test: ASTM D o C max GTR:100% pass #30, removed ambient grind requirement
36 Thank You.
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