session 9 construction considerations. objectives describe key aspects of: prepaving operations...
TRANSCRIPT
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SESSION 9SESSION 9
Construction Considerations
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ObjectivesObjectives
Describe key aspects of:
Prepaving operations
Paving operations
Postpaving operations
Understand effects of pavement texturing
Identify benefits of initial pavement smoothness
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Prepaving ActivitiesPrepaving Activities
Subgrade preparation
Base preparation
Joint layout
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Subgrade PreparationSubgrade Preparation
Mixing in coarser material or stabilizer (as needed)
Fine grading and compaction
Accurate trimming to establish grade
Setting grade stakes
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Base PlacementBase Placement
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Joint LayoutJoint Layout
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Paving ActivitiesPaving Activities
Mixing and transporting concrete
Placing concrete
Consolidating concrete
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Mixing and Transporting Concrete
Mixing and Transporting Concrete
Optimize workability
Mixing time and temperature
Mix design (water, cement, gradation)
Air content Optimize finishability
Fines content Avoid segregation
In every step of mixing, handling, transporting
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Placing ConcretePlacing Concrete
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Placing ConcretePlacing Concrete
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Consolidating ConcreteConsolidating Concrete
Remove entrapped air
Distribute concrete uniformly around the dowels and reinforcement
Avoid under / overconsolidation
Honeycombing
Bleeding
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Postpaving ActivitiesPostpaving Activities
Finishing
Texturing
Curing
Joint sawing and sealing
Opening to traffic
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FinishingFinishing
Screed off concrete surface level to desired height
Machine float to fill in low spots
Minimize hand finishing
Finishing too soon or too much will produce a surface with poor durability
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TexturingTexturing
Initial texturing by burlap or astroturf drag behind paver
Tine texturing as soon has sheen of bleed water has disappeared
Separate machines used for tining and applying curing compound
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Tine TexturingTine Texturing
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Tine TexturingTine Texturing
Important for surface friction and acceptable noise levels
Transverse tining most common procedure
For reduced noise levels, grooves:
3 to 5 mm deep
3 mm wide
Variably spaced 10 to 40 mm apart
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CuringCuring
Enhance hydration and strength gain
Retain moisture and heat immediately after placement and finishing
Most common method: liquid membrane-forming curing compound
Retains moisture, but not heat
Blanket insulation may also be needed
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Curing CompoundCuring Compound
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Joint Sawing and Sealing
Joint Sawing and Sealing
Saw to establish contraction joints
Conventional sawcut dimensions:
Depth: D/4 to D/3 typical
Width: 3 mm (0.12 in)
Lightweight saws permit shallower cuts
Widening cuts for sealant reservoir
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Sawcut TimingSawcut Timing
Time
Co
ncr
ete
Set
Sawcutting “Window”
Too Late:Random Cracking
Too Early:Excessive Raveling
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Joint SawingJoint Sawing
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SawcutSawcut
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Lightweight Sawing Equipment
Lightweight Sawing Equipment
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Joint Preparationand Sealing
Joint Preparationand Sealing
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HIPERPAV Computer Program
HIPERPAV Computer Program
Evaluates potential for uncontrolled cracking
Uses job-specific inputs for:
Mix design
Pavement design
Construction
Environmental factors
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HIPERPAVMix Design Inputs
HIPERPAVMix Design Inputs
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HIPERPAVPavement Design
Inputs
HIPERPAVPavement Design
Inputs
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HIPERPAVConstruction Inputs
HIPERPAVConstruction Inputs
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HIPERPAVEnvironmental Inputs
HIPERPAVEnvironmental Inputs
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HIPERPAV OutputHIPERPAV Output
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Initial Pavement Smoothness
Initial Pavement Smoothness
Riding comfort
Improved long-term performance
Smoothness specifications:
Improved initial smoothness levels
Total roughness per unit length
“Must-grind” bump
Incentives/disincentives
California profilograph
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California ProfilographCalifornia Profilograph
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Lightweight ProfilerLightweight Profiler
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Opening to TrafficOpening to Traffic
Time requirements
Strength requirements
Beam or cylinder testing
Maturity methods
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SummarySummary
Prepaving
Paving
Postpaving
Smoothness
Subgrade preparationBase preparation
Mixing and transportingPlacingConsolidation
FinishingTexturingCuringJoint sawing and sealing