Creep of Concrete Under Various Temperature, Moisture, and Loading Conditions.

An investigation was conducted to develop information on the time-dependent deformation behavior of concrete in the presence of temperature, moisture, and loading conditions similar to those encountered in a prestressed concrete reactor vessel. Variables were one concrete strength 6000 psi 41 MPa at 28 days, three aggregate types chert, limestone, and graywacke, one cement Type II, two types of specimens as-cast and air-dried, two levels of temperature during test 73 F and 150 F 23 C and 66 C, and four types of loading uniaxial, hydrostatic, biaxial, and triaxial. There were 66 test conditions for creep tests and 12 test conditions for unloaded or control specimens. Experimental results are presented and discussed. Comparisons are made concerning the effect of the various test conditions on the behavior of concrete and general conclusions are formulated. Author