Testing of 6-Inch-Diameter Concrete Cores from Martin Dam, Alabama Power Company.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS
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Thirty-three legnths of 6-in.-diameter concrete core from three drill holes in Martin Dam were examined. All three drill holes ran from the crest of the dam to the foundation. Part of the core from each hole was retained by the Alabama Power Co. The lengths received at the Structures Laboratory, U. S. Army Engineer Waterways Experiment Station, were examined petrographically. Twenty were tested ultrasonically to measure compressional and shear wave velocities. Of these 20 lengths, 6 were tested in unconfined compression 9 were tested in triaxial loading in 3 groups of 3 cores each at 3 confining pressures and 5 were tested for strength in direct tension. The petrographic report presents evidence of the occurrence of alkali-silica reaction in concrete from all three drill holes however, alkali-silica reaction gel was not found in the lower part of hole S-7. The compressional wave velocities ranged from 13,400 to 14,920 fps shear wave velocities ranged from 7870 to 9290 fps. Calculated dynamic moduli of elasticity ranged from 4.9 to 6.3 x 1,000,000 psi. Compressive strengths ranged from 3040 to 8450 psi static moduli of elasticity ranged from 2.17 to 4.18 x 1,000,000 psi, and Poissons ratios from 0.08 to 0.17. Triaxial compression tests at minimum principal stresses of 2500, 5000, and 9000 psi yielded cohesion values from 500 to 800 psi and angles of internal friction from 41 deg 00 min to 38 deg 45 min. Despite the presence of alkali-silica reaction, the Martin Dam concrete appears to be in acceptable condition and in better condition than some younger structures that are still in service.
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