concrete industry board morning seminar – 10/13/2011 concrete pumping: rocket science meets common...
TRANSCRIPT
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Concrete Industry Board Morning Seminar – 10/13/2011
Concrete Pumping:Rocket Science meets Common Construction
James Bury
Director – Engineering
Putzmeister America
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Concrete Pumping & Placement
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World Records in Concrete Pumping
Burj Khalifa tower (Dubai) – 606m vertical
Le Refrain in Haut Doubs, France2km horizontal
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Sensational Achievements
Panama Canal Expansion
Hoover Dam BypassTrump Tower - Chicago
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Concrete Pumping Dependency
Cement proportionWater proportionFly ash type Fly ash proportionSilica fume type Silica fume proportionSlag type Slag proportionWater reducer usageViscosity modifier usageAccelerator usage
Aggregate gradationAggregate roughnessAggregate porosityAggregate moistureAggregate max. sizeAggregate shapeSand fineness modulusSand roughnessSand moistureSand proportionCement type
Decelerator usageTotal mortar contentTotal fines contentFiber type & sizeFiber contentAge of concreteBatching quality control Material storage QCTemperatureComponent suspensionOn-site water addition
Mix and Environmental Factors
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Concrete Pumping Dependency
Available engine powerSystem power lossesHydraulic pressure capability Condition of wear itemsHopper configurationHopper agitator effectivenessVibrator locationDelivery cylinder size & lengthDelivery cylinder inside surfaceDelivery path continuityBoom arm configurationHeat added by equipment
Volume outputVertical pumping distanceHorizontal pumping distanceNumber of elbowsElbow radius and angleNumber of reducersLength & diameter of pipelinePipeline pressure ratingWater-tight pipeline (no leaks)Dent free pipelineSteel pipe vs. rubber hose
Equipment & Application Limiting Factors
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Concrete Pumping - Estimation
Job Specific:• Volume Output• Pipe Diameter• Horizontal Length• Vertical Length• Slump
Equipment Specific:• Engine Power• Line Pressure
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Concrete (Artificial Rock)
Aggregates
Smaller Grains < 2mm (sand)
Cementitious Materials (cement, fly ash, silica fume, slag)
Water
Admixtures (water reducers, accelerators, decelerators, viscosity modifiers, colorants
O
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Aggregates / Sand
• Maximum Size (1/3 Rule)• Gradation• Absorption/Porosity• Shape & Smoothness• Abrasiveness
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Water/Cementitious/Admixtures
Cementitious Materials CementFly ashSilica fumeSlag
Water
AdmixturesWater reducers Accelerators Decelerators Viscosity modifiers Colorants
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Concrete Pumping
Hopper
• Reservoir• Isolator• Flow Assistance/Manager
Delivery Cylinders
• Pull From Hopper• Begin Pumping Cross-Section• Push Into Valve & System
Distribution Valve
• Cylinder-to-Delivery Lines• Refinement of Cross-Section
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Concrete Pumping - Delivery
Mix Distribution
• Center Aggregate Rich Freedom of Movement Shear Flow
• Boundary Layer Aggregate Free – Mortar Rich Friction avoidance
Disruptions to Flow
Elbows Gaps, Dents, Edges Reducers
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Concrete Pumping - Delivery
Disruptions to Flow
Elbows Gaps, Dents, Edges Reducers
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Mortar & Fine Matter Content
Mortar Content Ratio(Mix ingredients < 2mm size)
Suspension and Transport Media
Minimum 50% by volume
Fine Matter Content(Mix ingredients < 0.125mm size)
Friction Fighter
Minimum 400 lbs/yd³
Water/Cementitious Ratio(Traditional Indicator)
Flow enabler
Cement: Minimum 0.40 (40% water)Cementitious: Depends on mix
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Example Mix Design & Analysis
MaterialWeight
(lbs) Lbs/ft³Volume
(ft³)
Cement 384 197 1.95
Fly Ash 50 144 0.35
#2 Natural Sand 1075 100 10.75
#57 Limestone 1100 162 6.79
#4 Limestone 600 162 3.70
Water 200 62 3.23
Air 1.0% 0 0.27
3409 Total 27
Criteria Actual Req'd Status
W/C (by weight) 46 40% - 60% OK
Mortar volume (ft³) 16.5 >13.5 ft³ OK
Fines (by weight) 434>400
lbs/yd³ OK
The Good
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Example Mix Design & Analysis
MaterialWeight
(lb) lbs/ft³Volume
(yd³)
cement 265 197 1.35
fly ash 115 144 0.80
slag 325 181 1.80
silica fume 20 144 0.14
sand 1430 162 8.83
aggregate - #57 1170 172 6.80
aggregate - #8 500 172 2.91
water 225 62 3.61
air 3.0% 0 0.81
4050 Total 27.0
Criteria Actual Req'd Status
W/C (by weight) 0.31 .40 - .60 Very Low
Mortar volume (ft³) 17.3 >12.1 ft³ OK
Fines (lbs) 725>400
lbs/yd³ OK but high
The Bad
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Example Mix Design & Analysis
The Unpumpable
MaterialWeight
(lb) lbs/ft³ Volume (yd³)
cement 685 197 3.48
fly ash 300 175 1.71
silica fume 30 144 0.21
sand 1375 162 8.49
aggregate - #57 1080 175 6.17
aggregate - #8 450 175 2.57
water 250 62 4.01
air 1.5% 0 0.41
4170 Total 27.0
Criteria Actual Req'd Status
W/C (by weight) 0.25 .40 - .60 Extremely low
Mortar volume (ft³) 18.3 >12.1 ft³ OK
Fines (lbs) 1015>400
lbs/yd³ Very High
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Mix Consistency
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In Process
ACI 304.2R – Placing Concrete by Pumping Methods
•Overhaul of 1996 standard•Publication 2012?
ACI 211-P – Proportioning for Pumpable Concrete
•New standard •Draft stage•Publication 2013?
ACI 238 – Workability of Fresh Concrete
•Rheology as method of predicting workability/pumpability•Effective & cost efficient method of replacing slump cone
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Thank You