Connecting the DOTs: ROADWAY USE OF RECYCLED MATERIALS

Transcription

1 Connecting the DOTs: ROADWAY USE OF RECYCLED MATERIALS Woody Raine, P.E. Recycling Program Coordinator Texas Department of Transportation

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3 Each year, TxDOT uses: Millions of tons of materials from: Roadways Industry Municipalities Demolition sources 3

4 Roadway Recycled Materials & Products Placed, FY08 >2 million tons Reclaimed Asphalt Pavement (06) >700,000 tons Recycled Concrete Aggregate 331,000 cu yd Compost 272,000 tons Fly Ash 9,500 tons Glass Traffic Beads 12,200 tons Crumb Rubber 3,400 tons Cellulose Fiber Mulch 4

5 Environmental Economic Financial 5

6 Financial Economic Environmental 6

7 Environmental Conserve water Conserve energy Conserve landfill space Conserve natural resources Reduce air & water pollution 7

8 Economic In 1995, 400 Texas organizations: employed more than 20,000 Texans added $3 billion to the Texas economy made new products from recycled glass, metal, paper, or plastics 8

9 Economic TxDOT Indeed, adheres it s good to business values that to be have good created stewards an of entire the industry out environment. of resource conservation. Michael Behrens former TxDOT Executive Director Transportation News, September

10 Financial Relieve regional material shortages Conserve native materials Meet environmental standards Reduce construction costs Reduce maintenance costs Improve performance Reduce hauling costs Reduce disposal costs Support markets for scrap materials 10

11 In FY08, TxDOT generated: 2.31 million tons of Reclaimed Asphalt Pavement (RAP) 1.55 million tons of concrete Reduce disposal cost Support scrap markets 11

12 In FY08, TxDOT generated: 14,000 whole tires 500 tons of scrap tire material Reduce disposal cost Support scrap markets 12

13 Environmental Financial Compost: Accelerates revegetation Reduces storm water runoff & erosion Protects water quality 13

14 FHWA Recycled Materials Policy Recycling highway construction materials can be a cost-saving measure, freeing funds for additional highway construction, rehabilitation, preservation or maintenance. 14

15 FHWA Recycled Materials Policy Give recycled materials first consideration Judge engineering & environmental suitability Assess economic benefits Remove non-technical restrictions 15

16 Obstacles Too much: Uncertainty Risk Too little: Information Experience Time 16

17 Standards Material Quality: Engineering performance Meet Spec Workability After life 17

18 Specs ensure quality Texas Department of Transportation Standard Specifications For Construction and Maintenance of Highways, Streets, and Bridges

19 Standards Specifications Even for one-time or district-only use Plan notes Guidelines for use 19

20 TxDOT Specifications Using Recycled Materials STANDARD SPECIFICATION Item 132. Embankment Item 161. Compost Item 193. Landscape Establishment RECYCLED MATERIAL ITEMS , EARTHWORK granular materials (such as crushed concrete, glass cullet, RAP) leaves, yard trimmings, biosolids, etc. loose organic materials such as wood chips or shredded bark APPLICATIONS stable embankment establish vegetation, control erosion (See compost producer list) mulch 20

21 Standards Material Quality: Engineering performance Environmental quality (DMS-11000) History of use, or Acceptable concentrations of chemicals of concern in Nonhazardous Recycled Product 21

22 DMS Guidelines for Evaluating & Using Nonhazardous Recyclable Materials (NRMs) NRMs with established histories of TxDOT use: metals tire rubber compost, shredded brush reclaimed asphalt pavement ground granulated blast furnace slag fly ash from electrical utility plants bottom ash from electrical utility plants non-industrial: ceramics glass cullet plastics crushed concrete TxDOT-owned materials 22

23 DMS Guidelines for Evaluating & Using Nonhazardous Recyclable Materials (NRMs) Concentrations of chemicals of concern in Nonhazardous Recycled Product must be less than either: In traditional material Background concentrations Residential Protective Concentration Levels 23

24 Conditions Material Quality Engineering performance Environmental Quality Sufficient Quantity Cost competitive Long-term cost Processing, handling Transporting 24

25 Identify Opportunities (Set Priorities) Large-quantity materials TxDOT FY08 generation: 2.13 million tons of RAP 1.5 million tons of concrete 65,000 of scrap tire equivalents Other C&D generators Industry Municipalities 25

26 Identify Opportunities (Set Priorities) Large-quantity materials Large usage applications Return on investment Momentum growing interest & knowledge Luck is being prepared for opportunity 26

27 Reclaimed Asphalt Pavement (RAP) Major uses: Road base Asphalt paving 27

28 Reclaimed Asphalt Pavement (RAP) Fractionating RAP into coarse & fine aggregates allows higher % RAP, including surface course 28

29 Recycled Concrete Aggregate Houston District Applications Cement Treated Base Flex Base Gabions Rock Filter Dam Dry Rip Rap 29

30 Recycled Concrete Aggregate 973 Materials, Austin Flex Base 30

31 Tires Annual Legislative Report 31

32 Tire Rubber Use, FY09 Chip Seal 64% Crack Sealant 9% Asphalt Pavement 27% 12,200 tons of crumb rubber, or 1.7 million scrap tire equivalents 32

33 Crumb Rubber Use Adds durability Holds aggregate Surface Treatments (Chip Seals, Seal Coats) 33

34 Crumb Rubber Use Wet weather performance Noise abatement Durability Permeable Friction Course I-35, San Antonio 34

35 Crumb Rubber Use Asphalt-Rubber Crack Sealer 35

36 Shredded & Whole Tire Use Slope Repair Embankment Construction 36

37 Shredded Tires Use El Paso District Embankments Tire Burrito Rice & Beans Pavement Soil Cap Burrito 37

38 Whole Tires Use Tire Bales Ft. Worth District I-30 Slope Repair Poor soil quality Groundwater Permanent repair 38

39 Whole Tires Use Tire Bales Ft. Worth District I-30 Slope Repair 39

40 Whole Tires Use Tire Bales Ft. Worth District I-30 Slope Repair Baling Scrap Tires 40

41 Whole Tires Use Tire Bales Ft. Worth District I-30 Slope Repair Tire bales placed on drainage layer 41

42 Fly Ash Microscopic view 42

43 Fly Ash Concrete Pavement Subgrade & Base Treatment Flowable Backfill Concrete Structures 272,000 tons, FY08 43

44 Fly Ash Primary Uses Stabilize Subgrade or Base Concrete Pavement Concrete Structures Bridge Slabs Retaining Walls Drilled Shafts Driveways, Sidewalks Railing Riprap Culverts & Drains Curbs, Gutters 44

45 Fly Ash - Base & Subgrade Stabilization Adds strength and durability Adds resistance to sulfates 45

46 Fly Ash - Structures & Pavement Reduces cement up to 35% Yields higher ultimate strengths, although initial strength gain is slower Improves resistance to alkali-silica reactivity (ASR) sulfates seawater Improves workability, pumpability 46

47 Fly Ash - Sources Material Producer List: Prequalified List of Fly Ash Sources: ftp://ftp.dot.state.tx.us/pub/txdotinfo/cmd/mpl/flyash.pdf 47

48 Glass cullet Uses: Road base Paving Pipe bedding Road Base, Devine, Texas 48

49 Foundry Sand Hensley Industries generates foundry sand Big City Crushed Concrete screens sand TXI blends screened sand into cement-treated base Hensley provides TXI with environmental testing results showing sand is nonhazardous TXI submits forms to TxDOT certifying sand is nonhazardous U.S. Silica Company 49

50 Asphalt Roofing Shingles TCEQ Standard Air Permit for Hot Mix Plants allow: Shingle-manufacturers scrap, 2006 Residential Tear-offs, added 2009 TxDOT Special Provisions for Asphalt Pavement SP SP Corsicana,

51 s Research Experience Material availability & quality Funding Allies Transportation & environmental agencies Universities Trade groups Industry members 51

52 Available? Prequalified Material Producer Lists Fly Ash Ground Granulated Blast-Furnace Slag NRMs TxDOT Recycled Materials Mapping System Generators Processors 52

53 3.3 Strategies Related to Road Construction & Roadways Maintenance 53

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56 TxDOT Web References TxDOT Recycles Home Page Specifications Using Recycled Materials Keyword: recycled specifications Recycled Materials Mapping System Keyword: recycled materials map 56

57 Web References Highway & Environmental Groups Federal Highway Administration - Turner-Fairbanks Highway Research Center - AASHTO Environmental Excellence Center environment.transportation.org Recycled Materials Center - Association of General Contractors (AGC) Environment Green Highways Partnership greenhighways.org U.S. Green Bldg Council: Neighborhood Development LEED

58 Web References Material-Related Groups American Coal Ash Association American Foundry Society Asphalt Shingles Asphalt Recycling & Reclamation Assn (ARRA) Construction Materials Recycling Association Foundry Industry Recycling Starts Today (FIRST) National Asphalt Paving Association Nat l Council for Air & Stream Improvement (paper & pulp) National Slag Association Portland Cement Association Rubber Manufacturers Association Rubber Pavements Association Silica Fume Association Slag Cement Association US Compost Council 58

59 Summary Recycle Financial, Environmental, Economic Engineering & Environmental Quality Long-term costs, Availability Set priorities, & prepare for opportunities Develop Specs Demonstrate, Evaluate, Track 59

60 Ready to go? Woody Raine, P.E. Recycling Program Coordinator General Services Division Texas Department of Transportation 512/