Introduction - History
Work began on the Upper Stillwater Dam in 1983 and was completed in 1987. At the time this was the world's largest RCC dam. The dam is constructed of 1,470,000 cubic yards of roller compacted concrete (RCC) and is located in Duchesne County , Utah . Constructed with no transverse contraction joints the RCC cracked at stress points throughout the dam. The cracks had been grouted previously with hydrophilic urethane materials, but had failed completely. This report is to present procedures, product information, results, testing and conclusions from using Mountain Grout Ultra, a moisture activated/cured polyurethane grout to repair the transverse cracks. The project consisted of remediation of leaks through 230' high existing RCC dam via polyurethane injection using 21,000 gallons of Mountain Grout Ultra. The general contractor was ASI RCC Incorporated. The sub-contractor was FEC (Nicholson). Mountain Grout Ultra is a single component (with accelerator) hydrophobic polyurethane that possesses the physical properties much the same as traditional hydrophilic systems. Mountain Grout Ultra was successful in stopping the leaks and this portion of the project was completed well in advance of schedule.
For the full report click HERE to download the .pdf file.