Creep Behavior of Portland Cement,Mortar,and Concrete under Biaxial Stress.

摘要

Equipment developed at the Oak Ridge National Laboratory was used to make uniaxial and biaxial creep tests on mortar,normal weight concrete and lightweight concrete using both sealed and unsealed specimens. Some of the results are questionable because of the poor performance of the strain gages. Nevertheless,useful information was obtained on shrinkage,creep and Poisson's ratio. Generally speaking,the results were consistent with the work of other investigators. Both the shrinkage and creep were highest for the mortar and lowest for the normal weight concrete and intermediate for the lightweight concrete. The shrinkage and creep were highest for the unsealed specimens. A Poisson's ratio effect in creep was noted but the magnitudes were slightly less than those expected for elastic loadings. (ERA citation 02:049233)