chapter 5 diamond grinding and grooving - · pdf filechapter 5 diamond grinding and grooving...
TRANSCRIPT
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Chapter 5Diamond Grinding and Grooving
From… Maintenance TechnicalAdvisory Guide (MTAG)
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Learning Objectives1. List benefits of diamond grinding and
grooving2. Describe recommended diamond
grinding/grooving dimensions3. Describe recommended construction
procedures4. List important quality control activities5. Describe potential construction and
performance problems6. Identify troubleshooting solutions
Chapter 5 – Diamond Grinding and Grooving
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Presentation Outline
IntroductionDesign considerationsConstructionQuality controlTroubleshooting
Chapter 5 – Diamond Grinding and Grooving
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GrindingGrinding
Diamond Grinding
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GrindingGrindingDiamond GrindingBenefits
Restored smoothnessImproved friction Improved cross slopeReduction in noiseImproved cross slope for reducing splash and spray
Chapter 5 – Diamond Grinding and Grooving
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GrindingGrindingDiamond GrindingEffect on Roughness
Percent decrease in IRI
Test Area Lane 1 Lane 2 Lane 3
1 59% 56% NA
2 NA NA 53%
3 64% 60% NA
4 NA NA 55%NA = Not applicable
Chapter 5 – Diamond Grinding and Grooving
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GrindingGrindingDiamond GrindingEffect on Friction
Percent increase in friction
Test Area Lane 1 Lane 2 Lane 3
1 25% 15% NA
2 NA NA 18%
3 41% 35% NA
4 NA NA 26%NA = Not applicable
Chapter 5 – Diamond Grinding and Grooving
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GrindingGrindingDiamond GrindingProject Selection
Consider effectiveness and limitationsIGGA and ACPA recommendations• Present serviceability index (PSI) range of 3.8
to 4.0• Before critical faulting level
Used with other CPR activities
Chapter 5 – Diamond Grinding and Grooving
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GrindingGrindingDiamond GrindingProject Selection
Traffic, ADT
Measure >10,0003,000 to 10,000 < 3,000
IRI, m/km (in/mi) 1.0 (63) 1.2 (76) 1.4 (89)
PSR 3.8 3.6 3.4
CA Profilograph, m/km (in/mi) 12 15 18
Chapter 5 – Diamond Grinding and Grooving
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GrindingGrindingDiamond GrindingProject Selection
Ave. Faulting, mm (in) Comment
0.8 (1/32) No roughness
1.6 (1/16) Minor Faulting
2.4 (3/32) Grinding Project
3.2 (1/8) Expedite Project
4.8 (3/16) Discomfort Begins
6.4 (1/4) Grind Immediately
Chapter 5 – Diamond Grinding and Grooving
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GrindingGrindingDiamond GrindingLimitations
Does not address structural or durability problemsHardness of aggregate affects costsRoughness will return if causes are not addressedAllowable work hours for the job can affect the cost
Chapter 5 – Diamond Grinding and Grooving
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GrindingGrindingDiamond GrindingFollowing Load Transfer Restoration
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GroovingGrooving
Diamond Grooving
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GroovingGrooving
Diamond Grooving
Cutting parallel grooves into the pavement using diamond saw bladesLongitudinal vs. transverseBenefits• Improved wet weather friction• Reduction in splash and spray
Chapter 5 – Diamond Grinding and Grooving
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GroovingGroovingDiamond GroovingProject Selection
Historical crash rate, friction number, or macrotexture depth dataPotential locations for wet weather crashesPavements should be structurally and functionally sound
Chapter 5 – Diamond Grinding and Grooving
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GroovingGroovingDiamond GroovingLongitudinal Grooving
Advantages• Restored surface friction• Decreased hydroplaning potential• Improved curve tracking• Easier to conduct under traffic
Disadvantages• Perception poor handling for motorcycles and
light cars
Chapter 5 – Diamond Grinding and Grooving
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GroovingGrooving
Transverse Diamond Grooving
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GroovingGroovingDiamond GroovingTransverse Grooving
Advantages• Most direct channel for water drainage• Introduces a surface that provides significant
braking traction
Disadvantages• Maintaining adjacent traffic• Excessive noise• Productivity
Chapter 5 – Diamond Grinding and Grooving
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GroovingGroovingDiamond GroovingEffect on Friction
10 20 30 40 50
5
10
15
20
•
•
•
•
2
•
••
1
3
4
6
•5
7
7½
8
9
•
•YEARS OF
OPERATION
MILLION VEHICLE PASSAGES/LANE
WET
PC
CP
AC
CID
ENT
RA
TE (A
CC
/MV
K)
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Module 5-1
Design, Materials & Specifications
From… Maintenance TechnicalAdvisory Guide (MTAG)
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Presentation Outline
IntroductionDesign considerationsConstructionQuality controlTroubleshooting
Chapter 5 – Diamond Grinding and Grooving
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GrindingGrindingDiamond GrindingDesign Considerations
Degree of faultingReview past corrective effortsDesign specifications• Concurrent preservation techniques• Blade spacing• Transverse slope• Grinding limits and transitions
Chapter 5 – Diamond Grinding and Grooving
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GrindingGrindingDiamond GrindingDimensions
Land area - varies depending on aggregate hardness2.0 mm typical for hard aggregate2.8 mm in typical for soft aggregate
Width of diamond blades(2.5 mm - 3.3 mm)
Chapter 5 – Diamond Grinding and Grooving
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GroovingGroovingDiamond GroovingDesign Considerations
Groove entire lane areaAllowances for small areas with surface irregularitiesUse recommended blade spacing
Chapter 5 – Diamond Grinding and Grooving
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GroovingGroovingDiamond GroovingDimensions
19 mm
3.2 mm min6.4 mm max
Saw blade thickness2.5 mm
Chapter 5 – Diamond Grinding and Grooving
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Typical Item CodesItem Code Description
066145 Remove pavement markers074017 Prepare water pollution control program074020 Water pollution control074042 Temporary concrete washout (portable)120090 Construction area signs120100 Traffic control system128650 Portable changeable message sign413111 Repair spalled joints420201 Grind existing concrete pavement420102 Groove existing concrete pavement413114 Replace joint seal (existing concrete pavement)
http://i80.dot.ca.gov/hq/esc/oe/awards/#item_code
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Module 5-2
Construction and Inspection
From… Maintenance TechnicalAdvisory Guide (MTAG)
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Presentation Outline
IntroductionDesign considerationsConstructionQuality controlTroubleshooting
Chapter 5 – Diamond Grinding and Grooving
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GrindingGrindingDiamond GrindingConstruction Considerations
Grinding sequence and patternContinuous operationBegin and end perpendicular to centerlineMaximum overlap of 50 mm (2 in)Disposal of slurry
Chapter 5 – Diamond Grinding and Grooving
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GrindingGrindingDiamond GrindingCutting Head Specifications
Diamond blades mounted in series on cutting headCutting head width from 48 to 50 inSpacing of 56 to 61 blades per ft
Chapter 5 – Diamond Grinding and Grooving
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GrindingGrindingDiamond GrindingCutting Head
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GrindingGrindingDiamond GrindingConstruction Procedures
Single lane closureConduct grinding parallel to centerlineMultiple passes per laneSlurry removal
Chapter 5 – Diamond Grinding and Grooving
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GrindingGrindingDiamond GrindingGrinding Machine
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GrindingGrindingDiamond GrindingGrinding Machine
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GrindingGrindingDiamond GrindingTrucks Collecting Slurry
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GrindingGrindingDiamond GrindingGrinding Process
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GrindingGrindingDiamond GrindingFront of Grinding Head
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GrindingGrindingDiamond GrindingBehind the Grinding Head
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GrindingGrindingDiamond GrindingAfter First Pass of Grinding Machine
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GrindingGrindingDiamond GrindingFinished Product
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GroovingGroovingDiamond GroovingConstruction Considerations
Groove dimensionsDirection of groovingDisposal of slurryProcedures similar to diamond grinding
Chapter 5 – Diamond Grinding and Grooving
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GroovingGroovingDiamond GroovingEquipment
Head width: 1 to 6 ftLongitudinal blade spacing of 3/4 inchVacuum system employed to collect slurry
Chapter 5 – Diamond Grinding and Grooving
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Presentation Outline
IntroductionDesign considerationsConstructionQuality controlTroubleshooting
Chapter 5 – Diamond Grinding and Grooving
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GrindingGrindingDiamond GrindingQuality Control
Profile• Pavement roughness• Need acceptance standards
Skid resistance• Standard smooth tire• Improvement may be temporary if aggregate is
susceptible to polishing
Chapter 5 – Diamond Grinding and Grooving
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GroovingGroovingDiamond GroovingQuality Control
Quality assessed through frictionValues prior to grooving compared with post-grooving valuesDirect measurement of surface texture can also be used
Chapter 5 – Diamond Grinding and Grooving
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Project Checklist
Preliminary Responsibilities • Document Review • Project Review
Equipment Inspections • Diamond-Grinding Machine• Profilograph or Profiler
Others • Weather Requirements • Traffic Control
Chapter 5 – Diamond Grinding and Grooving
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Project Checklist
Project Inspection Responsibilities • Alignment • Texture • Residues
Chapter 5 – Diamond Grinding and Grooving
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Presentation Outline
IntroductionDesign considerationsConstructionQuality controlTroubleshooting
Chapter 5 – Diamond Grinding and Grooving
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Troubleshooting
Construction quality and performance problemsApproach:IdentifyProblem
DetermineCause
IdentifySolution
Chapter 5 – Diamond Grinding and Grooving
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GrindingGrindingTroubleshooting—GrindingPossible Construction Problems
Lack of horizontal overlap (dogtails)Lack of horizontal overlap (dogtails)
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GrindingGrindingTroubleshooting—Grinding What is wrong here?
Unground areas (holidays)Unground areas (holidays)
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GrindingGrindingTroubleshooting—Grinding What is wrong here?
Poor vertical match between passesPoor vertical match between passes
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GrindingGrindingTroubleshooting—Grinding Possible Construction Problems
Problem:Uneven material removal due to spalledor broken pavementPotential causes?
Chapter 5 – Diamond Grinding and Grooving
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GrindingGrindingTroubleshooting—Grinding Possible Construction Problems
Problem:Remaining fins do not break easilyPotential causes?
Chapter 5 – Diamond Grinding and Grooving
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GroovingGroovingTroubleshooting—Grooving Possible Construction Problems
Problem:Unground areas from low spotsPotential causes?
Chapter 5 – Diamond Grinding and Grooving
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GroovingGroovingTroubleshooting—Grooving Possible Construction Problems
Problem:Non-uniform groove depthsPotential causes?
Chapter 5 – Diamond Grinding and Grooving
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Troubleshooting Guide – Causes and Solution
“Dogtails”“Holidays”Poor vertical match between passes.The fins that remain after grinding do not quickly break free. Large amounts of slurry on the pavement during grinding.
Chapter 5 – Diamond Grinding and Grooving
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Troubleshooting Guide – Causes and Solution
Lack of horizontal overlap. Isolated areas with inconsistent groove depth. Inconsistent groove depth near joints. Large amounts of slurry on the pavement during grooving. Light vehicles and motorcycles experience vehicle tracking.
Chapter 5 – Diamond Grinding and Grooving
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Presentation Outline
IntroductionDesign considerationsConstructionQuality controlTroubleshooting
Chapter 5 – Diamond Grinding and Grooving
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Learning Objectives1. List benefits of diamond grinding and
grooving2. Describe recommended diamond
grinding/grooving dimensions3. Describe recommended construction
procedures4. List important quality control activities5. Describe potential construction and
performance problems6. Identify troubleshooting solutions
Chapter 5 – Diamond Grinding and Grooving
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Thank You
Questions?
Chapter 5 – Diamond Grinding and Grooving