concrete test section rpf 8 may 2002. objectives design details material properties instrumentation...
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Concrete Test Section Concrete Test Section
RPF
8 May 2002
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ObjectivesDesign detailsMaterial properties InstrumentationTrafficConstructionConclusion
OutlineOutline
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To calibrate cncRisk at the lower end of the traffic spectrum
To quantify failure of low-volume concrete pavements
ObjectivesObjectives
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Cement and Concrete InstituteCSIR TransportekUniversity of Pretoria
Alpha Stone and ReadymixBKSRaubex
PartiesParties
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University of PretoriaSection 1
75 mm SFRC (30 kg/m3) Joint spacing 3 m140 mm Foam concrete subbase In situ
Section 275 mm SFRC (30 kg/m3) Joint spacing 6 & 4 m 125 mm CTS In situ
Design detailsDesign details
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University of Pretoria (cont)Section 3
75 mm SFRC (30 kg/m3) No joints25 mm ETB125 mm CTS In situ
Design detailsDesign details
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CSIR TransportekSection 4
50 mm “CRCP”50 mm ETB125 mm CTS In situ
Section 575 mm “CRCP” 25 mm ETB 125 mm CTS In situ
Design detailsDesign details
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CSIR TransportekSection 6
100 mm “CRCP”125 mm CTS In situ
Design detailsDesign details
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C&CISection 7
100 mm butt jointed Joint spacing 2 and 3 m125 mm CTS In situ
Section 8100 mm butt jointed Joint spacing 2 and 3 m40 mm continuously graded asphalt 100 mm CTS In situ
Design detailsDesign details
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C&CISection 9
140 mm jointed Joint spacing 2, 3 and 4 m125 mm gravel In situ
Section 10140 mm butt jointed Joint spacing 2, 3 and 4 m125 gravel In situ
Design detailsDesign details
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C&CISection 11
140 mm dowel jointed Joint spacing 2, 3 and 4 m Dowels 25 mm @ 300 c/c
125 mm gravel In situ
Design detailsDesign details
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In situCBR 80Quartzitic gravel A-1-a G5/G6Compaction 97% Mod. AASHTOFWD deflections 1,0 mm
Material PropertiesMaterial Properties
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SubbaseAs in situCompaction 97% Mod. AASHTOStabilized with 2% CEM I 42.5 (C3)
(Recycler)UCS 2000 kPaFWD deflection 0,9 mm and Stab 0,5 mm
Material PropertiesMaterial Properties
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ETBSubbase materialStabilized with 1,5% anionic stable grade
60%, 1% cementAsphalt
Continuously graded hot mix with 60/70 pen
12 mm aggregate size
Material PropertiesMaterial Properties
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ConcreteStrength
fc 22 - 42 MPa
ff 3,7 - 5,6 MPa
Mod E 24 - 33 GPaShrinkage 0,05 - 0,06 %Cement CEM I 42,5/GGBS 80/20
Material PropertiesMaterial Properties
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LVDT’sCentreSide
ThermocouplesConventionalProgrammable
MDD’sWeather station
InstrumentationInstrumentation
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Readymix concreteCompaction by poker and beamCuring compoundPlastic sheeting
ConstructionConstruction
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Trucks leaving quarryWeighbridge dataNo of axlesApproximately 300 E80’s per dayTo date 14 000 E 80’s
TrafficTraffic
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Very little distress to dateVertical movement at joints under traffic
but no relative movementRocking of slabs on foam concreteSome corner breaksPlastic shrinkage cracks not affecting
performance
ObservationsObservations
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Ongoing observationsContinual recording of instruments to
end MayPanel to define failureAnalysis of resultsAvailability of data
FutureFuture
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Thank you Thank you