Repair_Materials_and_Techniques.pptx

1. Materials & Techniques for
Repair and Retrofitting

2. Overview of Repair Materials
• Epoxies
• Polymers
• Latex
• Modified Mortars
• Special Concretes
• Bonding Agents
• Grouting Agents
• Surface Coatings

3. 1. Epoxies
• Description: Thermosetting resins with high adhesive strength and chemical
resistance.
• Applications:
• Crack injection and sealing.
• Bonding old and new concrete.
• Structural repairs and anchoring.
• Crack repair (injection into structural cracks)
• Bonding new concrete to old concrete
• Anchor bolts or steel plates to concrete
• High-strength patching and overlays

4. 2. Polymers
• Description: Organic compounds (e.g., acrylics,
styrenes) added to improve concrete properties.
• Types: Polymer-modified cement, polymer-
impregnated concrete.
• Applications:
• Enhancing tensile strength, flexibility, and water
resistance.
• Surface protection and patch repairs.

5. 3. Latex
• Description: Aqueous dispersion of polymers
(e.g., SBR - Styrene Butadiene Rubber, or
Acrylic Latex).
• Applications:
• Enhances bond strength, waterproofing, and
durability.
• Used in repair mortars, plastering, and bonding
agents.

6. 4. Modified Mortars
• Description: Mortars mixed with polymers,
latex, or fibers.
• Applications:
• Surface levelling and patch repairs.
• Improved workability, adhesion, and crack
resistance.

7. 5. Special Concretes
• Examples: Fiber-reinforced concrete (FRC),
self-compacting concrete (SCC), micro-
concrete.
• Applications:
• Structural strengthening.
• Repairs in inaccessible or congested areas.
• High durability applications.

8. 6. Bonding Agents
• Description: Materials that ensure adhesion
between old and new concrete or mortar.
• Common Types: Epoxy-based, latex-based.
• Applications:
• Concrete overlays.
• Repair patches and resurfacing.

9. Grouting Agents
• Description: Cementitious, epoxy, or
chemical-based fluids used to fill voids/cracks.
• Applications:
• Crack sealing.
• Void filling beneath foundations or slabs.
• Anchor bolts and dowel bars.

10. Grouting Agents
• Description: Cementitious, epoxy, or
chemical-based fluids used to fill voids/cracks.
• Applications:
• Crack sealing.
• Void filling beneath foundations or slabs.
• Anchor bolts and dowel bars.

11. 8. Surface Coatings
• Types: Epoxy coatings, polyurethane, acrylics,
silanes/siloxanes.
• Functions:
• Protection against carbonation, chloride ingress,
UV, and moisture.
• Aesthetic enhancement.
• Anti-corrosion and waterproofing.

12. Epoxies, Polymers, and Latex
• Epoxies: Used for crack injection and bonding
old to new concrete; high strength and
chemical resistance.
• Polymers: Improve flexibility, adhesion, and
reduce permeability.
• Latex: Enhances bond strength, workability,
and reduces shrinkage in repair mortars.

13. Modified Mortars and Special Concretes
• • Polymer-modified mortars: High adhesion
and reduced cracking.
• • Fibre-reinforced concrete: Enhanced tensile
strength and ductility.
• • Micro-concretes: Flowable, non-shrink mixes
used in jacketing and difficult access areas.

14. Bonding and Grouting Agents
• • Bonding Agents: Epoxy or polymer slurry to
bond old and new concrete surfaces.
• • Grouting Agents: Cementitious or epoxy-
based grouts to fill cracks, anchor steel, and
restore integrity.

15. Surface Coatings
• • Acrylic, epoxy, and polyurethane coatings for
protective layers.
• • Anti-carbonation coatings to prevent CO₂
ingress.
• • Waterproofing membranes for enhanced
durability.

16. Overview of Repair Techniques
• • Stitching
• • Grouting
• • Replacement Concrete
• • Rust Eliminators & Rebar Coatings
• • Foamed Concrete
• • Mortar & Dry Packing
• • Vacuum Concrete
• • Gunite & Shotcrete
• • Epoxy Injection
• • Mortar Repair
• • Shoring & Underpinning

17. Crack Repair – Stitching & Injection
• • Stitching: Steel staples across cracks restore
structural continuity.
• • Epoxy Injection: Injecting epoxy into cracks
to restore strength and prevent moisture
ingress.

18. Concrete Replacement & Packing
• • Replacement Concrete: Removal and
recasting of damaged sections.
• • Dry Packing: Low-water mortar packed into
small areas for void or crack repair.
• • Foamed Concrete: Lightweight and
insulating fill material.

19. Surface Repair & Advanced Methods
• • Gunite & Shotcrete: Pneumatically applied
concrete for surface and structural
strengthening.
• • Vacuum Concrete: Reduces water content to
improve density and strength.
• • Mortar Repair: For surface cracks and small-
scale damage restoration.

20. Rebar Treatment
• • Rust Removal: Wire brushing or rust
converters to clean rebars.
• • Rust Eliminators: Chemical treatment to
neutralize corrosion.
• • Polymer Coatings: Protective layers on
rebars to prevent future rusting.

21. Shoring and Underpinning
• • Shoring: Temporary structural supports
during repair work.
• • Underpinning: Strengthening foundations
using piers, jack piles, or extensions.
• • Applied in buildings with differential
settlement or increased loading needs.