Concrete and Rock Core Tests, Major Rehabilitation of Starved Rock Lock and Dam, Illinois Waterway, Chicago District. Phase I. Rehabilitation.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS
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Drilling for laboratory testing of concrete and foundation rock was carried out for the U.S. Army Engineer District, Chicago, as part of a major rehabilitation program at the Starved Rock Lock and Dam. The structures are on the Illinois Waterway. Laboratory testing of the concrete core was done to ascertain the extent of concrete deterioration and to determine selected physical properties of the concrete. Foundation rock core was tested for purposes of obtaining characterization properties and engineering design parameters. The rock test results, if found to be significantly lower than previously reported, are to be used for checking a structural stability analysis. Laboratory testing included the determination of compressive strength, unit weight, compressional wave velocity, elastic modulus, triaxial strength, and direct shear strength. Direct shear tests were conducted on intact and discontinuous rock specimens. The concrete core indicates moderate to severe deterioration on most all exposed concrete surfaces. The predominant cause of the deterioration has been cycles of freezing and thawing. The average depth of frost-damaged concrete in the lock chamber walls is 0.20 ft in the upper gate bays, it is 0.23 ft and lower gates bays, none. The top 0.75 ft of concrete in the lower approach wall is frost damaged while the walls vertical surface is not damaged.
- Civil Engineering