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Course Outline
Welcome and Introductions
Achieving Durable Concrete in Your Repair Projects
- Concrete materials
- Cements
- Aggregates
- Admixtures
- Quality design, materials, and workmanship
- Placement, consolidating, and finishing
- Concrete curing
- Common forms of concrete deterioration
- Examples of field problems
- Repair approach
- Consideration of many parameters
Evaluating Concrete Condition
- Types of damage
- Cracking, water leakage, and staining
- Corrosion-related damage
- Structural deficiencies and distress
- Fire damage
- Strength and durability considerations
- Assessing the risk of failure
- Methods of damage assessment
Fundamentals of Concrete Repair
- Recent history of concrete repair; evolution
- Materials
- Surface preparation and removal techniques
- Conventional methods
- Hydro-demolition
- Hydraulic nibblers
- Diamond cutting
- Mechanical scarification
- Abrasive blasting
- Reinforcing steel
- Achieving bond
- Material delivery (packaging) to site
- Placement techniques
- Fundamentals of application of concrete repair materials
Understanding the Corrosion Process
- Steel bar installed in an elevated energy state
- Factors affecting concrete chemistry
- What is passivation of steel?
- How the protected layer is formed
- Corrosion chemistry
- How to disrupt the corrosion process
- Treatments to slow corrosion process
Structural Repairs
- Post-tensioning repairs
- External post-tensioning
- Shear collars
- Supplemental shear reinforcement
- Overlays
- Using appropriate repair methods for different structure types
- Case studies
Protection Methods for Concrete Structures
- Paints
- Membranes
- Sealers
- Overlays
- Cathodic protection
Concrete Repair Specifications
- Writing a specification for quality repair
- Monitoring repairs for conformance to specifications
Shotcrete
- A versatile repair approach
- Wet mix or dry mix?
- Skill of nozzleman and entire crew
- Short examples of shotcrete use
Repair of Floor Slabs
- Crack repair
- Epoxy injection
- Route and seal
- Stitching/Pinning
- Joint stabilization
- Sub-sealing
- Load transfer devices
- Overlays and coatings
- Latex modified concrete
- Thin polymer
- Self-leveling
Pavement and Slab-on-grade Evaluation Methods
- Objectives of comprehensive evaluation
- References and standards
- Manual assessments
- Laboratory evaluation of materials
- Developing a restoration strategy
Repair of Pavement, Sidewalks, and Exterior Slabs on Grade
- Full-depth repairs
- Partial-depth repairs
- Load transfer restoration
- Slab stabilization
- Diamond grinding
- Joint and crack sealing
- Bonded and unbounded overlays