chapter 7 isolated partial depth concrete repair n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Chapter 7 Isolated Partial Depth Concrete Repair PowerPoint Presentation
Download Presentation
Chapter 7 Isolated Partial Depth Concrete Repair

Loading in 2 Seconds...

play fullscreen
1 / 67

Chapter 7 Isolated Partial Depth Concrete Repair - PowerPoint PPT Presentation


  • 125 Views
  • Uploaded on

Chapter 7 Isolated Partial Depth Concrete Repair. From… Maintenance Technical Advisory Guide (MTAG). Partial-Depth Repairs. 3-4. 2. Learning Objectives. List benefits of partial-depth repairs Describe the advantages and disadvantages of different available repair materials

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Chapter 7 Isolated Partial Depth Concrete Repair' - brendan-welch


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
chapter 7 isolated partial depth concrete repair

Chapter 7Isolated Partial Depth Concrete Repair

From… Maintenance Technical

Advisory Guide (MTAG)

learning objectives
Learning Objectives
  • List benefits of partial-depth repairs
  • Describe the advantages and disadvantages of different available repair materials
  • Describe recommended construction procedures
  • List important quality control activities
  • Describe potential unexpected adjustments or construction quality problems
  • Identify troubleshooting solutions
presentation outline
Presentation Outline
  • Introduction
  • Design considerations
  • Construction
  • Quality control
  • Troubleshooting
introduction
Introduction
  • Definition

Removal and replacement of small, shallow areas of deteriorated PCC at spalled or distressed joints.

  • Distress limited to upper 1/3 of slab
  • Existing load transfer devices are functional
benefits
Benefits
  • Restores structural integrity
  • Improves ride quality
  • Extends the service life
  • Restores a well-defined uniform joint sealant reservoir
good candidate projects
Good Candidate Projects
  • Spalling associated with joint inserts
  • Spalling caused by intrusion of incompressibles
  • Spalling associated with localized areas of scaling, weak concrete, clay balls, or high steel
poor candidate projects
Poor Candidate Projects
  • Joint spalling associated with dowel bar misalignment or lockup
  • Spalled cracks
  • Spalling associated with durability problems or reactive aggregate
presentation outline1
Presentation Outline
  • Introduction
  • Design considerations
  • Construction
  • Quality control
  • Troubleshooting

design materials specifications

Module 7-1

Design, Materials & Specifications

From… Maintenance Technical

Advisory Guide (MTAG)

design considerations
Design Considerations
  • Selecting repair boundaries
  • Material selection
  • Curing
  • Opening to traffic
selecting repair boundaries detecting deteriorated concrete

DULL

SHARP

Unsound-Delaminated

Solid

Selecting Repair BoundariesDetecting Deteriorated Concrete

Sounding the pavement:

  • Hammer
  • Steel rod
  • Steel chain
selecting repair boundaries repair dimension recommendations
Selecting Repair Boundaries Repair Dimension Recommendations
  • Minimum dimensions
    • Length: 300 mm (12 in)
    • Width: 100 mm (4 in)
    • Depth: 50 mm (2 in)
  • Extend repair 75 to 100 mm (3 to 4 in) beyond visible deterioration
  • Combine close patches (<0.6 m [2 ft])
  • Repair entire joint if > 2 patches
material selection repair material types
Cementitious

PCC-based

Gypsum-based

Magnesium phosphate

High alumina

Material SelectionRepair Material Types
  • Polymeric
    • Epoxy
    • Methyl methacrylate
    • Polyester-styrene
    • Polyurethane
  • Bituminous
material selection bonding agents
Material SelectionBonding Agents
  • Enhances repair to pavement bond
  • Sand-cement grouts used with PCC repair materials
  • Epoxy bonding agents used with both PCC and proprietary materials
material selection factors
Material Selection Factors
  • Allowable lane closure time
  • Ambient temperature
  • Cost
  • Size of repair
  • Estimated performance
curing
Curing
  • Cure to avoid shrinkage cracks
  • Hot-weather curing—curing compound, moist burlap, or polyethylene
  • Cold-weather curing—insulating blanket or tarp
  • Follow recommendations for proprietary materials
opening to traffic
Opening to Traffic
  • Opening criteria
    • Minimum strength (20.7 MPa [3,000 psi])
    • Minimum time
  • Opening based on actual PCC strength is preferred
typical item codes
Typical Item Codes

http://i80.dot.ca.gov/hq/esc/oe/awards/#item_code

construction and inspection

Module 7-2

Construction and Inspection

From… Maintenance Technical

Advisory Guide (MTAG)

presentation outline2
Presentation Outline

  • Introduction
  • Material selection
  • Construction
  • Quality control
  • Troubleshooting

construction steps
Construction Steps
  • Marking repair boundaries
  • Concrete removal
  • Repair area cleaning
  • Joint preparation
  • Bonding agent application
  • Patch material placement
  • Curing
  • Joint sealing
concrete removal
Concrete Removal
  • Saw-and-patch (recommended)
  • Chip-and-patch
  • Mill-and-patch
  • Hydrodemolition
joint preparation1

Joint

Joint Preparation

75 mm (3 in)

Bond breaker

75 mm (3 in)

Patch

Plan View

Scoring

Pavement

25 mm (1 in)

Profile View

bonding agent application
Bonding Agent Application
  • Patch area must be clean
  • Application techniques
  • Coat horizontal and vertical surfaces
  • Apply uniformly
patch material placement general guidelines
Patch Material PlacementGeneral Guidelines
  • Batch small quantities
  • Temperature recommendations
  • Some epoxy materials placed in lifts
  • Overfill patch area by ~3 mm (1/8 in)
  • Consolidate material
  • Screed and hand trowel
presentation outline3
Presentation Outline

  • Introduction
  • Material selection
  • Construction
  • Quality control
  • Troubleshooting

quality control
Quality Control
  • Verify repair boundaries
  • Monitor to assure no damage to surrounding concrete
  • Inspection of repair preparation material placement, and finishing
  • Proper curing techniques
quality control class exercise
Quality ControlClass Exercise
  • Break into three groups
    • Preliminary responsibilities
    • Equipment inspection, weather requirements, and traffic control
    • Construction inspection considerations
  • Identify importance of each item
  • Use Reference Manual and your experience
project checklist
Project Checklist
  • Preliminary Responsibilities
    • Document Review
    • Project Review
  • Materials Checks
    • Concrete patch material
    • Other materials
    • Joint Sealing
    • General
project checklist1
Project Checklist
  • Equipment Inspections
    • Concrete Removal Equipment
    • Patch Area Cleaning Equipment
    • Mixing and Testing Equipment
    • Placing and Finishing Equipment
    • Other Equipment
  • Others
    • Weather Requirements
    • Traffic Control
project checklist2
Project Checklist
  • Project Inspection Responsibilities
    • Patch Removal and Cleaning
    • Patch Preparation
    • Placing, Finishing, and Curing
    • Patch Material
    • Resealing Joints and Cracks
  • Cleanup Responsibilities
presentation outline4
Presentation Outline

  • Introduction
  • Material selection
  • Construction
  • Quality control
  • Troubleshooting

troubleshooting

Identify

Problem

Determine

Cause

Identify

Solution

Troubleshooting
  • Unexpected adjustments and construction quality problems
  • Approach:
troubleshooting unexpected adjustments
TroubleshootingUnexpected Adjustments
  • Problem

Deterioration beyond original boundaries

  • Solution?
troubleshooting unexpected adjustments1
TroubleshootingUnexpected Adjustments
  • Problem

Deterioration deeper than upper 1/3 of the slab thickness

  • Solution?
troubleshooting construction quality problems
TroubleshootingConstruction Quality Problems
  • Problem

Patch material flows into joint

  • Potential causes?
troubleshooting construction quality problems1
TroubleshootingConstruction Quality Problems
  • Problem

Cracking or debonding of patch material

  • Potential causes?
troubleshooting guide causes and solutions
Troubleshooting Guide – Causes and Solutions
  • More deterioration than expected
  • Exposed steel
  • Patch material in crack or joint
  • Patch cracking
presentation outline5
Presentation Outline

  • Introduction
  • Material selection
  • Construction
  • Quality control
  • Troubleshooting

learning objectives1
Learning Objectives
  • List benefits of partial-depth repairs
  • Describe the advantages and disadvantages of different available repair materials
  • Describe recommended construction procedures
  • List important quality control activities
  • Describe potential unexpected adjustments or construction quality problems
  • Identify troubleshooting solutions