Roller-Compacted Concrete (RCC) Dams; Report 1, Laboratory Characterization ofRCC Cores from Elk Creek Dam, Trail, Oregon

摘要

Ths report documents the results from a laboratory mechanical propertyinvestigation of large-diameter, roller-compacted concrete (RCC) core samples obtained from the main Elk Creek Dam, Trail, Oregon. The test matrix included 10 unconfined compression tests, 13 unconfined tension (direct pull) tests, 8 triaxial compression tests, 16 direct shear tests, and 7 splitting tensile strength tests. Eight of the direct shear tests and six of the unconfined tension tests were performed for the purpose of characterizing the strength properties of the interfaces between the RCC lifts. All tests were performed quasi-statically on air-dry specimens of the RCC. In addition, an extensive suite of nondestructive pulse velocity tests were performed on the cores to assess the degree of anisotropy in the RCC. This included numerous P-(compression), Sa-(shear waves vibrating in the axial plane), and Sr-(shear waves vibrating in a radial or cross-axis plane) wave speed determinations measured radially through the core with propagation directions oriented 0, 45, 90, and 135 deg from the