Presented by: Albert Johnson, CIWMB; Ding Cheng, PhD, CP2 Center

1. Presentation Of A Chico State Student Engineering Project That Resulted From Curricula Development Contract For Rubberized Asphalt Concrete And Civil Engineering Uses Of Tire-Derived Aggregate Today decides tomorrow!!! Presented by: Albert Johnson, CIWMB; Ding Cheng, PhD, CP2 Center Cody Menefee, CSUC Student; Julian Storelli, CSUC Student April 14, 2009

2. Introduction • Project Objective • Project Management Team • Project Schedule

3. Project Overview • Continuing Education of Professionals • University Curricula Development • Professor Training Workshops

4. Workshops for Professionals • Created website for storing resource information • Developed presentation materials • Presentations at various conferences or workshops • CAAPA (California Asphalt Paving Association) technical meeting -August 2008 • 2008 MSA (Maintenance Superintendent Association) annual meeting – August 2008 • 2009 TRB (Transportation Research Board) annual conference – January 2009 • 2009 ASEE-PSW (Pacific Southwest Division of American Society for Engineering Education) conference – March 2009 • APWA (American Public Work Association) northern CA meeting – April 2009

5. Roadmap of Waste Tire in University Education Curricula

6. Eleven Civil Engineering Classes in CSU Chico CIVL 415 Reinforced Concrete Design CIVL 431 Environmental CIVL 441 Transportation CIVL 551 Foundation CIVL 575 Solid Waste CIVL 598 Asphalt Paving Materials • CIVL 131 Introduction to Civil Engineering Design • CIVL 311/CMGT345 Strength of Materials • CIVL 312 Structural Testing Lab • CIVL 402 Contract Spec and Technical Writing • CIVL 411 Soil Mechanics Curricula Are Online

7. Professor Training Workshops • Sacramento, CA – December 2008 • Pomona, CA – January 2009 • San Luis Obispo, CA – April 2009 30 Professors 15 Universities

8. 2008 Transportation Engineering class and Contract class Students formed groups to solve problems with RAC and TDA Sample Student Presentations The following is a student group lab assignment. They have a hypothetical company ECS and hypothetical project.

9. Environmental Construction Services (ECS) Presented by students: Cody Menefee, and Julian Storelli A civil engineering consulting firm specializing in the development of environmentally sensitive construction practices. Our mission statement is to educate companies on environmentally conscious construction methods..

10. Waste Tires in California 40 Million Waste Tires produced annually About 75% recycled 1.5 million have been illegally dumped and stockpiled 10 Million waste tires left in California which can: • pollute the ground • expose community to disease • create fire hazards

11. Project Location

12. How ECS can help with the expansion of highway 99 • Utilizing Rubberized Asphalt Concrete (RAC) in the expansion of highway 99. • Using recycled tire aggregate (TDA) as retaining wall backfill. • Slope stabilization using recycled tire aggregate.

13. Rubberized Asphalt Concrete: What is RAC? • RAC or RHMA is a composite of traditional asphalt mix and recycled tire rubber Background • Developed in Arizona in 1960’s. • Caltrans began use in 1978. • California, Arizona, Texas, Florida have used extensively • Used in chip seals, inter-layer, and hot-mix asphalt

14. Los Angeles, Ca Original Condition One year later

15. 5 years later 10 years later

16. ECS has investigated Highway 99 from the skyway exit to route 32 RAC can be utilized throughout the entire project • 2.1 miles • 88,700 yd2 of asphalt (does not include on/off ramps)

17. Benefits • Utilizes waste tires (2000 tires per lane mile). =25,000 tires on this project • Reduces vibration • Reduces noise • Less maintenance • Improves durability • Improves traction • Reduces the spray/splash and eliminates standing water when raining • Increases contrast / improves stripping visibility

18. Using Tire Derived Aggregates Retaining Wall Backfill

19. Tire Derived Aggregates (TDA) Shredded chips of waste tires Range in size from 12 inches to 3 inches for shreds and 3 inches to .5 inch for chips Can be used mixed with soil Usually enclosed in a geotextile fabric then covered with soil Specific Gravity of tire chips between 1.1 and 1.3

20. TDA as Backfill for Retaining Wall Pros: • TDA reduces unit weight of fill material allowing for construction on areas with low bearing capacity • Decreases the overturning moment • TDA gives good permeability as a coarse granular alternative • Improves compressibility

21. Example Applications Maine (1996) • Topsham - bridge abutment wall California (2003) • Riverside – Retaining wall along west bound route 91

22. Retaining Wall Location

23. Benefits Reduction of Wall Size: • Reduction in the cost of materials • Reduction in labor California Department of Transportation can save up to $13,000 / 100ft Stockpiles in California reduced by 75 tires per cubic yard

24. ECS Final Recommendations Use the following Processes • RAC • Retaining Walls • Slope Stabilization Benefits • Environmental • Financial • Social

25. THANK YOU The Beginning Keeping Good Use of Waste Tire http://www.cp2info.org/center