Page 76 - Bridge and Highway Structure Rehabilitation and Repair

CHAPTER 2 DIAGNOSTIC DESIGN AND SELECTIVE RECONSTRUCTION 51

4. Slip forming parapets.

5. Engineered fills for backfills behind abutments.
6. Repair spalling concrete.
7. Hydro-removal of concrete for patching.

2.2.14 Corrosion Protection Strategies for Increased Life
1. Epoxy rebar, top mat only.
2. Epoxy rebar, top and bottom mats.
3. Low permeability concrete.
4. Corrosion inhibitor.
5. Surface sealer.

2.2.15 Deck Cracking and Effl orescence
1. High negative moment over piers.
2. Deficient rebars detailing.

3. Shrinkage cracks due to high water/cement ratio during curing.
4. Excess cement paste in concrete.
5. Excess number of shear connectors.
6. Small aggregate sizes.
7. Inadequate bar cover.

2.2.16 Cost Effective Preventive Strategies
1. Address problems related to deferred maintenance.
2. Improved procedures for over 100 maintenance issues.

3. Avoid field welding for fracture critical tension members.
4. Resolve MPT issues during reconstruction.
5. Ensure environmental protection during maintenance.
6. Implement effective management techniques such as planning, scheduling, monitoring, and
reporting.
7. Train bridge engineers and technicians through bridge management training courses.

2.2.17 Potential for New Applications
Further information needs to be developed for the following:
1. Deck crack sealing with high molecular weight methacrylate.
2. Deck crack sealing with silane/siloxanes.
3. Precast prestressed concrete beam repair.
4. Special coatings on prestressed concrete beam end, e.g., paint or sealer.
5. Substructure concrete sealers.
6. Composite wrapping of substructure caps.
7. Repairing undermined footings.
8. Debris removal after culvert demolition.
9. Culvert sediment removal.
10. Approach slab patching.
11. Deck surface sealing with boiled linseed oil.