ICRI 2002 Project Award Winner
ICRI 2010 Project Award Winner
ICRI 2012 Project Award Winner
ICRI 2002 Project Award Winner
Material Suppliers
Tecnochem
Honorable Mention: Water Structures Category
Repair of Wisla-Czarne Dam Concrete Structures
The Wisla-Czarne Dam is a small earth dam built in 1973. Workmanship faults, poor concrete quality and exposure to severe environmental conditions caused deterioration of the concrete, which was unsuccessfully repaired several times over the years. This project allowed the evaluation of the structures to detect the damage that was causing the water infiltration. Test repairs were performed that enabled the selection of effective repair materials and sealing methods for underground tunnels being repaired 25 meters below water level. Six years of field testing were conducted to check durability and select the best material for protection of the concrete shield against wavy motion and ice aggression. Field corrosion monitoring was performed to determine the proper repair system for the carbonated walls of the overflow channel. Once the research was completed, the project was awarded. Once the repairs began, different structural faults of the expansion joints were detected and repaired. Each of the renovated structures (service and monitoring tunnels, bottom outlet valves chamber, concrete shield on the upstream side of the dam, overflow channel, bridge over the overflow channel and discharge basin) demanded different, individually selected repairs and protection dedicated to local exposure conditions. All repairs were successfully completed and water infiltration was dramatically reduced.ICRI 2010 Project Award Winner
Material Supplier/
Manufacturer
Technochem
Award of Merit: Transportation Category
Man Maurizio Viaduct Joint Repair
The San Maurizio Viaduct, located on Highway A22 in northern Italy, was built in the 1960s and underwent repairs from 2006 to 2009. The main reason for repair was the continual failure of mechanical expansion joints between adjacent multiple-span bridge decks. The new solution to the problem of leaking expansion joints was the development of continuous bridge decks. This continuity was achieved by removing the expansion joints and replacing a portion of two adjacent decks with sections of reinforced ductile concrete. In the case of the San Maurizio Viaduct, the designers suggested substituting 80% of the mechanical joints using continuous low-stiffness ductile slabs. The adjacent bridge decks had been connected over four to six spans to a length of 590.5 ft (180 m). The link slabs needed the following properties: a high-deformation capacity under cyclic loading, a low Young’s Modulus, high strength, and high resistance to fatigue. Ductile cement-based materials are able to absorb big deformation-generating, well-distributed small cracks without crack localization. This large strain capacity is over 100 times that of normal concrete. The ductile high-fracture energy concrete was then poured directly from the concrete mixer truck. Reinforced ductile high-fracture energy concrete met all of the requirements that were essential for the link-slab application, as it has high strain capacity under tension and compression regime while forming small, closely spaced microcracks. It also allowed for the deformation under thermal loads, along with the creation of a partially uninterrupted deck to protect the underlying superstructure and substructure. Finally, the advantages were not just related to the lower repair cost. When considering lifecycle costs, the link slabs became not only feasible, but also advantageous. This was the first time that ductile link slabs had been used in Europe.ICRI 2012 Project Award Winner
Material Supplier/
Manufacturer
Technochem