applications & design of rcc ptpavements - sefindia.org · applications & design of rcc...
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Applications & Design of RCC P tPavements
Wayne Adaska, P.E. Director, Public WorksPortland Cement Association
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RCC Pavements
Introduction ApplicationsMix DesignMix DesignThickness DesignPerformancePerformance
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Cement-Based Pavement M t i lMaterials
Roller-Compacted Conventional
tent
pConcrete Concrete
PerviousConcrete
nt C
ont
Soil-Cement
Concrete
Cem
en
Flowable Fill
Water Content
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Definition
“R ll C t d C t (RCC) i l“Roller-Compacted Concrete (RCC) is a no-slump concrete that is compacted by vibratory rollers.”
Zero slump (consistency of dense graded aggr.)No formsNo formsNo reinforcing steel No finishinggConsolidated with vibratory rollers
Concrete pavement placed in a different way!
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Benefits of RCCPBenefits of RCCP
Fast construction with minimum laborFast construction with minimum laborHigh load carrying abilityEli i t tti & k b dEliminates rutting & spans weak subgradesEarly strength gainDurableLow maintenanceLow maintenanceLight surface reduces lighting requirementsE i lEconomical
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Project ConsiderationsProject Considerations
P j t iProject sizeSite geometryLoading characteristicsEnd useClientClient expectations
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Surface AppearanceSurface Appearance
Not as smooth as conventional concreteImportant to precognize differenceSimilar appearanceSimilar appearance to asphalt only light grey instead of blackgrey instead of black
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Engineering Propertiesg g p
Compressive strength (f’c)–4,000 to 10,000 psi
Flexural strength (MR)–500 to 1,000 psi500 to 1,000 psi–MR = C(f’c)1/2 where C = 9 (up to 11)
Modulus of elasticityModulus of elasticity–3,000,000 to 5,500,000 psi
E C (f’ )1/2 h C 57 000 ( t 67 000)–E = CE(f’c)1/2 where CE = 57,000 (up to 67,000)
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Compaction Very ImportantCompaction Very Important
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ApplicationsApplications
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Log Sort YardsLog Sort Yards
Vancouver Island, BC, 1978
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Military Facilities
Ft. Lewis, WA ,1986 Ft. Carsons, CO, 2008
Ft. Drum, NY, 1990
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Intermodal FacilitiesIntermodal Facilities
Central Station, Detroit, MI
Burlington Northern, Denver, CO
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CN Intermodal Yard, CalgaryCN Intermodal Yard, Calgary
RCC decreased t k it ti f truck wait time from
8 to 2 hours
Unsurfaced aggregateis difficult to maneuverand presents safetyand presents safetyhazard
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Port Terminals
Port of Houston, TX, 2007
Norfolk International Terminal, VA, 2006
, ,
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Distribution CentersDistribution Centers
18 acre distributioncenter in Austin, TX
10 years after construction
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Warehouse FacilitiesWarehouse Facilities
RCC sed as orking
Warehouse, Appleton, WI
RCC used as working platform for cast-in-place
tilt-up walls
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Parking Areas
207 acres Honda facility, AL 2001
134 ki f ili134 acre parking facility at Saturn plant, TN, 1988
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Streets & Interchanges
I t ti l tIntersection replacement Calgary, AB
Residential streetResidential street Columbus, OH
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Highway Shoulders
I-285 HighwayAtlanta, GA
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Dams
C.E. Siegrist Dam, PA
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Overtopping ProtectionOvertopping Protection
Lake Lanape, PABoney Falls Dam, MI
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Waste Handling Facilities
25 acre sludge drying basins in Austin, TX
5 acre composting yard near Toronto
1 acre composting yard in North Augusta, SC
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Mixture DesignMixture Design
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Mixture DesignMixture Design
Modification needed in conventionalModification needed in conventional concrete mixture procedures
N t i t i d–Not air-entrained–Zero (negative) slump–Lower paste content–Higher fines content (2 to 6%)–Nominal max. size aggregate +/- 5/8 in.
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Conventional Concrete vs RCCConventional Concrete vs RCC
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Mixture DesignMixture Design
Dry enough to support vibratory rollerWet enough to permit adequate distribution of paste
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Proportioning MethodsProportioning Methods
S l th d il blSeveral methods available:
–Concrete consistency testsConcrete consistency tests
–Soil compaction method
–Optimal paste volume method
–Solid suspensions model
Always allow time and money for field trialAlways allow time and money for field trial
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Aggregate SelectionAggregate Selection
Aggregate selection very importantResponsible for mix workability, segregation, ease of consolidationPre-blended or stored separately
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Aggregate SelectionAggregate SelectionSelect a sound, well-graded aggregate
– For stability under vibratory roller, aggregate interlock for load transfer, flexural strength
Highway base course asphalt or concreteHighway base course, asphalt or concrete aggregates can be used5/8” maximum size aggregate5/8 maximum size aggregate
– For smooth surface, less segregation
Higher fines contentHigher fines content – Provides additional paste to fill voids and maintain tight
surface– Avoid plastic (clay) fines
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Aggregate GradationAggregate Gradation
1” 3/8” #4 #16 #2005/8”
80%
100%1 3/8 #4 #16 #2005/8
Pas
sing
60%
80%
RCCC i l
Per
cent
20%
40%RCCConventional
0 010 11101000%
20%
0.010.1110100
Sieve Size (mm)
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Optimum Combined Gradation (Shilstone Method)
The Coarseness Factor Chart provides on overview of the mixtureoverview of the mixture
The 0.45 Power Chart shows a trend
Percent of aggregate retained on individual sieves (8/18 rule) shows detailsindividual sieves (8/18 rule) shows details
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Aggregate GradationAggregate Gradation
Sieve Size Percent Passing Actual PercentSieve Size Percent Passing Actual Percent in mm Minimum Maximum Gradation Retained1" 25 100 100 100 0.0
3/4" 19 95 100 100 0.01/2" 12.5 75 90 85.2 14.83/8" 9.5 65 85 75.0 10.23/8 9.5 65 85 75.0 10.2#4 4.75 40 60 57.0 18.0#8 2.36 25 50 43.5 13.5
#16 1 18 20 40 34 2 9 3#16 1.18 20 40 34.2 9.3#30 0.6 10 30 24.3 9.9#50 0.3 7 20 10.6 13.7#100 0.15 5 15 2.1 8.5#200 0.075 2 6 0.7 1.4
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*
Coarseness Factor (CF) = % retained on 3/8 in. ÷ % retained on # 8 sieve x 100
Workability Factor (WF) = % passing #8 sieve + [ 2.5 x (lb/yd3 of cementitious material – 564) / 94]
( )25% /56.5% x 100 = 44.2%
43.5% pass #8 sieve; 2.5 (500-564)/94 = -1.7; 43.5 -1.7 = 41.8%
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Soil Compaction MethodSoil Compaction Method
Determine moisture content–Construct moisture/density curveConstruct moisture/density curve–Modified proctor ASTM D1557
A di t t t (–Assume a median cement content (e.g. 500 pcy)
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Moisture-Density RelationshipMoisture Density Relationship
143
144
cf)
142
143
nsit
y (l
b/
140
141
Dry
De
140
2% 3% 4% 5% 6% 7% 8%
Moisture Content
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High Density Ensures Superior StrengthHigh Density Ensures Superior Strength
6,000 800
5,000
ngth
(psi
)
600
ngth
(psi
)
4,000
ssiv
e St
ren
nsile
Stre
n
Compressive Strength
3,000
Com
pres 400
Split
Ten
Tensile Strength
2,00094% 96% 98% 100%
Wet Density (% Modified Proctor)
200
y (% )
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Soil Compaction MethodSoil Compaction Method
D t i titi t i l t tDetermine cementitious materials content–Use optimum moisture content–Run cement series
• e.g., 11%, 13%, 15%, 17%
–Select cement content which yields appropriate strength.
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Strength vs Cement ContentStrength vs. Cement Content
6,000
6,500
sive
725
697
5 000
5,500
,
Com
pres
sng
th (
psi)
667
636
4,500
5,000
28
-Day
CS
tren 636
603
5694,00010% 12% 14% 16% 18%
Cement Content
569
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Admixtures
Fly ash, slag, silica fume have been used
Retarders can be used to increase working time
W t d d t i k bilitWater reducers used to increase workability
Air entrainment very difficult in the field, but y ,– Experience has shown RCC can be made F/T resistant
Fibers seldom usedFibers seldom used – Increased difficulty with mixing & compaction
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Sample RCC Mix Designs
Port of TacomaUnits
Port of Tacoma Intermodal Yard CTL Mix Canada Mix
Coarse Aggregate lb/cy 1,700 2,106 2,210Fine Aggregate lb/cy 1,700 1,378 1,338
MSA in 5/8 3/4 1/2% Finer Than #200 % 3 - 7 2 1
Cement lb/cy 450 504 470Fl A h lb/ 100 0 36 ( ili f )Fly Ash lb/cy 100 0 36 (silica fume)Water lb/cy 257 211 172
Admixture oz/cwt none none 5 (WR)w/c ratio - 0 47 0 42 0 34w/c ratio - 0.47 0.42 0.34
Unit Weight lb/cy 154.3 152.0 153.1Compressive: 3 day psi 1,810 5,460 -Compressive: 28 day psi 6,050 7,900 -
Flexural: 3 day psi 525 690 1,205Flexural: 28 day psi 770 900 1,640
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ThicknessDesign
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Thickness Design of RCC Pavements
Follows rigid pavement design methodsPlain undoweled unreinforced concretePlain, undoweled, unreinforced concrete pavementThi k ff t d b fl l t thThickness affected by flexural strength and fatigue behaviorPCA’s Structural Design of RCC for Industrial PavementsPCA RCC-PAVE Program
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Slab Tensile Stress is CriticalSlab Tensile Stress is Critical
Stress is affected by:• Load• Load• Tire pressure, spacing• Slab thickness
S bb t• Subbase support• Concrete stiffness
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Design AssumptionsDesign Assumptions
Interior loadingInterior loadingMonolithic slab action for multi-layer
t ticonstructionLoad transfer across joints/cracksConservatism:–Design curve below fatigue testsDesign curve below fatigue tests–Strength gain with age
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Fatigue FactorFatigue Factor
Fatigue: Material failure which occursFatigue: Material failure which occurs when it ruptures under continued repetitions of loads that cause stressrepetitions of loads that cause stress less than material strengthFl l (t il ) t th t l fFlexural (tensile) strength controls for pavements.Stress ratio: Flexural stress/strength
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Engineering PropertiesFatigue
1
0.8
s R
atio
, SR
50%95%Conv Design
0.6
Stre
ss
gRCC Design
0.41.0E+01 1.0E+02 1.0E+03 1.0E+04 1.0E+05 1.0E+06 1.0E+07
Load Applications to Failure, Npp
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Thickness Design ProcedureThickness Design Procedure
Support strength of subgrade (k value)Vehicle characteristics–Wheel loads–Wheel spacing–Wheel spacing–Tire characteristics
Number of load repetitions during design life–Number of load repetitions during design lifeFlexural strengthModulus of elasticity
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Thickness Design ProcedureThickness Design Procedure
Subgrade SupportSubgrade Support–“k” value in units of pci
U l t l d t t ti t d–Use plate load test, or estimated relationships
V hi l L dVehicle Loads–Normally, heaviest wheel load controls–Contact area: wheel load/tire pressure–Wheel spacing: per manufacturerp g p
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Thickness Design ProcedureThickness Design Procedure
Typically 90-day flexural strength used
Allowable pavement stress < Design pavement stresspavement stress
Allow stress = (stress ratio) x (flex str)Allow stress = (stress ratio) x (flex str)
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Design for Stress RatioDesign for Stress Ratio
Stress Ratio = critical applied tensile stressModulus of Rupture (flexural strength)Modulus of Rupture (flexural strength)
where:
critical applied stress is the maximum tensile stress at the bottom of the concrete pavement slab, and
Modulus of Rupture is the tensile strength of a concreteModulus of Rupture is the tensile strength of a concrete beam tested using 1/3-point loading at 90 days
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Design Example
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Design ExampleContainer Carrier, Single WheelAxle load: 52 000 psi Wheel load: 26 000 psiAxle load: 52,000 psi, Wheel load: 26,000 psiTire pressure: 100 psiTi t t 26 000/100 260 iTire contact area: 26,000/100 = 260 sq inSubgrade modulus: 100 pciRCC flex str: 700 psiRCC modulus of elasticity: 4,000,000 psiy pLoad frequency: 20 reps/dayDesign life: 20 years, therefore;Design life: 20 years, therefore;20 yr x 365 x 20 reps/day = 146,000 total reps
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0.45 146 K
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Design ExampleDesign Example
Subgrade Strength
Flex Strength Total Stress ThicknessStrength
(pcf)Strength
(psi)Total Reps
Stress Ratio
Thickness (in.)
100 700 146,000 0.45 10100 900 146,000 0.45 9300 700 146,000 0.45 9.5100 700 Unlimited 0 41 11100 700 Unlimited 0.41 11100 500 146,000 0.45 12.5100 700 Unlimited 0.41 13.5
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RCC - PAVE Computer Program
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PerformancePerformance
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Freeze-Thaw DurabilityField performance excellent, although not air entrainedMinor surface paste (1/16”) erodes, then stabilizesstabilizesRCC results variable under ASTM C666 (F/T) and C672 (Deicer scaling)and C672 (Deicer scaling)Tests appear to be too severe based on
t l iactual experienceDurability tests used for masonry concrete and precast units possibly more appropriate
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Freeze-Thaw Durability TestsFreeze Thaw Durability Tests
Conventional Concrete (ASTM C666)
Brick and Structural Clay Tile (ASTM C67)Brick and Structural Clay Tile (ASTM C67)
Concrete Paving Units (ASTM C936)
Concrete Masonry Units (ASTM C1262)
Soil-Cement (ASTM D560)
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Freeze-Thaw Durability
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Roller Compacted ConcreteRoller-Compacted Concrete Pavements–
A Study of Long Term PerformancePerformance
PCA Research Report RP 366PCA Research Report RP 3661999
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Research ParametersResearch Parameters
P j t d i f 3 t 20Projects ranged in age from 3 to 20 yearsVariety of applications and loading conditionsDifferent climatic conditionsTotal of 34 projects inspected in both U.S. and Canadaand CanadaSynopsis of 18 projects included in report
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Surface Texture & ConditionSurface Texture & Condition
Thin layer of surface fines
llnormally worn away in first 2-3 yearsStabilizes thereafterStabilizes thereafterCoarse aggregate exposed, butexposed, but embeddedProvides traction
BN Yard, Denver - 13 years
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Surface Texture & Condition
Some patches of more extensive surfaceextensive surface erosion occur which are likely due toare likely due to aggregate segregation
Ft. Drum, NY - 11 years
Surface will vary inSurface will vary in texture
BN Yard, Denver - 13 years
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Joints/Cracks
RCC cracks betweenRCC cracks between 15 ft to 60 ftCracks are transverse to pavement directionLongitudinal cracks at paving lanesIf RCC surfacedIf RCC surfaced, cracks will reflect
112th St., Edmonton, ABCrack through asphalt
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Joints/Cracks
Cracks have remained very narrow/tighty gMost cracks not sealedSome raveling especially g p yalong longitudinal jointsVirtually no faulting
Ft. Drum, NY - 11 yearsy g
found. Good apparent load transferVirtually no maintenance for most pavements
O’Hare Reservoir, IL - 3 years
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SurfacingCentral Freight
Hornsby Bendy
Brownsville
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More Information
www.cement.org/pavements
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Questions?Discover how beautiful concrete can be