civil engineering applications of tire shreds · • insulation to improve performance of heat...
TRANSCRIPT
CIVIL ENGINEERING APPLICATIONS OF TIRE DERIVED AGGREGATE
Dana N. Humphrey, Ph.D., P.E.Professor of Civil Engineering
University of Maine
2017 Colorado WasteTire ConferenceJune 21, 2017
Tire Derived Aggregate – TDA
Why use TDA?• TDA has properties that civil engineers
need• Lightweight (1/3 soil)• Low earth pressure (1/2 soil)• Good thermal insulation (8 times better)• Good drainage (10 time better)• Compressible• Vibration damping
Why use TDA?• TDA is often cheapest alternative if you
need their unique properties
Why use TDA?• Can use lots of tires!!!
–75 tires per C.YD. of tire shred fill–400,000 tires for bridge
abutment, Topsham, Maine–1.2 million tires for highway
embankment, Portland, Maine–1 million tires for leachate
collection system in Delaware
Where can TDA be used?• Landslide stabilization• Lightweight embankment fill• Lightweight backfill for walls• Lightweight fill over culverts• Free draining backfill for “French Drains”• Stormwater infiltration basins• Vibration damping beneath rail lines• Backfill for residential foundations (drainage & insulation)• Insulation to limit frost penetration beneath roads• Insulation to improve performance of heat pumps• Drainage layers for landfills• Gas collection layers and trenches for landfills
Photo: Courtesy of Kennec, Inc.
Geysers road slide repair
Geysers road slide repair
Geysers road slide repair
Geysers road slide repair
North Abutment of Merrymeeting Bridge
el. 9.4 mClay
el. 5.2 m
el. 8.2 m
Type B Tire Shreds
NativeSoil
Type ATire Shreds
229 mm BituminousConcrete Pavement
AggregateSubbase
el. 11.3 m
el. 10.1 mel. 10.7 m
Station 53+35.4
CommonBorrow Granular
Borrow
AggregateSubbase
Geotextile
Piles
Station53+72.0
@ Center LineStation53+50.6
Concrete Approach Slab
4.2 m TDA
1.9 m soil cover
Initial Placement of TDA
Placement with Dump Truck
Compaction with 10-ton Roller
Goal of Presentation!
Place Soil Cover
Cost Comparison
Material Unit wt. Cost $/lb of weight credit
TDA 57 pcf $25/c.y. 0.37 Extruded
polystyrene 2 pcf $80/c.y. 0.66
Expanded shale 75 pcf $80/c.y. 1.60
Highway Edge DrainWitter Farm Road
Typical Cross Section
Place Edge Drain
TDA use in landfills
Donovan, et al., 1996
CASE HISOTRY - ChaquitaLandfill, Los Angeles County, CA
Gas Collection Trenches
• 3-ft x 3-ft trenches excavated into existing waste; perforated pipe placed in center
• TDA covered with geotextile
Chaquita Landfill
Photo: CalRecycle
Chaquita Landfill
Photo: CalRecycle
Conclusions• TDA has properties that engineers need• TDA can be cost effective• Civil engineering applications an
important use for scrap tires– Multiple highway and landfill applications
• Specifications and guidelines available• Negligible environmental effects
QUESTIONS?