2 d Luhr-RCC Applications
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Transcript of 2 d Luhr-RCC Applications
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RCC Applications
for Pavements
David R. Luhr, PhD, PE
Program Manager
Portland Cement Association
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.33.44Fine Aggregate Ratio
.48.35w/cm ratio
31 %22 %Paste Volume100 %100 %Total
6 %3 %Air
46 %44 %Coarse Aggregate
23 %34 %Fine Aggregate
15 %10 %Water
10 %9 %Cementitious
Conventional
Concrete
RCC
VolumeAbsolute
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RCC Pavement RequirementsBased on:
Smoothness (IRI)
Concrete Density (for durabil ity, frost, permeabil ity) Concrete Strength (for fatigue)
Uniformity of Product (Density, Strength)
Surface Texture (for smoothness, appearance,friction)
Class 1 High Specification
Class 2 Moderate SpecificationClass 3 Low Specification
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Placing Equipment High density ABG
pavers
Vibrating screed
Dual tamping bars
High initial density,
90-95%
Reduces subsequentcompaction
High-volume
placement (1,000 to
2,000 cubic yards per
shift)
Designed for harsh
mixes
Smoothest RCC
surface
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Access Provided Directly Behind the ABG
Paver (Prior to Roller Compaction)
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Placing Equipment Conventional Asphalt
Pavers
Provides some initialdensity (80-85%)
Relatively smooth
surface
May require
modification
Increased cleaning
and maintenance
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Conventional Paver
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Quebec Truck Terminal
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Alternate Placing Equipment Aggregate spreaders
Jersey spreader
Motor grader/dozer
No initial compaction
Lower quality
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Off-Highway Applications
Log sort yards and haul roads Military applications
Tank hardstands
Maintenance yards
Intermodal shipping
Truck terminals/distribution centers
Industrial operations
Parking and storage
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Caycuse Log Sort Yard
Wagner L90 Log Carrier, 200k Axle Loads
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Louisiana Pacific
Tacoma, WA
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Fort Benning, GA1986
Tank Trail and Hardstand
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Maintenance Yard
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Central Freight, Austin
New Pavement, 1987
After 10 Years of Use
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Covenant Transport
Chattanooga, TN
Existing Conventional
Concrete
New RCC
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Hornsby Bend, Austin
Municipal Composting
Dillo Dirt for Sale
New RCC Old RCC
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Knoxville, TN Compost Facility
Next Day Traffic
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AutomobileRecycling
Facility
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Storage
Bins
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Wal-Mart Distribution Facility
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GM Saturn Plant
Spring Hill, TN
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HONDA AMERICA - ALABAMA
ALL INTERIOR ROADS--RCC
30 FT WIDE-7 DEPTH
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Warehouse Facilities
Lynnterm Terminal
Port of Vancouver, BC
Interior Floor
WSI, Appleton, WI
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Container Facilities
RTG Crane
Straddle Carrier
Toplifter
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Bearing-Capacity Failure
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Rutting in Asphalt with
Channelized Loadings
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RCC at Conley Terminal Boston (built 1986)
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Pier 300 - Port of Los Angeles1998
90 Acres of RCC
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CN Intermodal Yard, Calgary1998
Unsurfaced aggregateis difficult to maneuver
and presents safety
hazard
RCC decreasedtruck wait time from
8 to 2 hours
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BN Intermodal Yard, Denver1986
Straddle Carrier
35 Acres,
Up to 20 in. Thick
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Norfolk International Terminal
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New Container TerminalProjects for 2007
Port of Houston (50 acres)
Norfolk-Southern Railroad
Intermodal Terminal (Columbus,
OH) (90,000 cu. yds)
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Streets and Highways
Industrial access roads Residential streets
Highway inlays
Fast-track, high-volume intersections
Shoulders and turn lanes
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Industrial Access Roads
Merridian St., Edmonton, Alb.
Tennessee DOT
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Fort McMurray, Alberta
Rutted Asphalt
Milled Out
RCC Placed as Inlay
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Mill & Inlay - Mississippi
Before
During Inlay
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Calgary Intersection
High-Volume Asphalt Intersection Milled and
Replaced by RCC in 60-hour Weekend Construction
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Residential Street
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Residential Street
Alliance, NE
Subdivision Streets:
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Subdivision Streets:
All-Weather Access
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Arterial Roads
Flexural Strength of 400 psi
in 24 48 hrs
Can surface within hours
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Atlanta Shoulders
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RCC Performs
RCC performance unknown in 70s/80s Gained confidence in 90s that RCC will
perform for 20+ years
PCA R&D project commissioned
Roller Compacted Concrete Pavements - A
Study of Long Term Performance
Confirmed anecdotal evidence of
performance
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Surface Texture & Condition
Thin layer of surfacefines normally worn
away in first 2-3
years
Stabilizes thereafter
Coarse aggregate
exposed, butembedded BN Yard, Denver - 13 years
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Freeze/Thaw - Deicer Scaling Pavements exposed
to F/T and deicersalts have fared
exceptionally well
Numerous examplescited in report
Likely Rd., BC, built
1987. Heavy truck braking
Chip seal worn off
No deterioration
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Natural Cracks
Most economical
30 to 80 ft spacing
Often first cracksappear within 24
hours
Narrow crack widths
Seal if > 1/8 in.
Best load transfer
Minimal ravellingNew, Unsealed
Crack
10-yr Old
Sealed Crack
Saw Cut Joints
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Saw-Cut Joints
More aesthetically
pleasing
Soff-cut very
effective, shortly
following placement Need to saw within
12 hours to avoid
uncontrolled cracking 1/3 to 1/4 depth
Surface Smoothness
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Surface Smoothness
Unsurfaced RCC can
be built for low to
medium speed traffic
High density paver
achieves good ride
quality
Joints/cracks do not
affect ride quality
99th Ave Portland, OR - 12 yrs
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Portland Cement Association
www.cement.org/
pavements