Dynamic Testing of Laterally Confined Concrete
Final rept. Jul 88-Aug 89,
CALIFORNIA INST OF TECH PASADENA DEPT OF INFORMATION SCIENCES
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For investigating the effects of deformation rate in confined deformation of concrete, a hydraulic pressure cell has been designed and installed on the 3-inch diameter Split-Hopkinson Pressure Bar SHPB system at the University of Florida. Plain concrete specimens were tested in axial dynamic compression while subjected to moderate lateral confining pressure. A simple design of a small cell supported by an O-ring near the specimen end of each of the two pressure bars was produced. The specimen is protected by a latex membrane that overlaps the pressure bar ends but does not extend to the O-rings. Water is used as the hydraulic fluid. The cell was designed for a maximum pressure of 3000 psi 20.7 MPa. The lateral pressure is not constant during a test, because of the lateral expansion of the specimen. A small amount of air was trapped in the cell before the water was introduced, so that further compression of the trapped air would accommodate the specimen expansion. The pressure rise was held to less than 50 percent in most of the tests.
- Ceramics, Refractories and Glass
- Test Facilities, Equipment and Methods