Title: Simplified Description of Creep Surface for a Portland Cement Mortar

Author(s): Leonard G. Tulin

Publication: Journal Proceedings

Volume: 65

Issue: 6

Appears on pages(s): 470-476

Keywords: creep (materials);dimensional analysis;models;mortars (material);plain concrete;portland cements;regression analysis;research;rheological properties;shrinkage;strains;stresses.

DOI: 10.14359/7486

Date: 6/1/1968

Abstract:
The purpose of this study is the analysis of creep of plain portland cement mortar under uniform compressive stress from a phenomenological viewpoint with the objective of obtaining an alternate form of the strain-stress-time rela-tionship to that obtained from visco-elastic analysis. The aim is to obtain relationships which are more usable than the expressions obtained from the analysis of rheological models. The techniques of dimensional analysis are used to organize an experimental program and to determine the form of the expression describing the strain-stress-time surface. A suitable least squares method is used in the numerical evaluation of parameters in the equation of the surface, and some conclusions are drawn regarding the validity of the results. Comparison of the simplified equation of the creep sur-face with the results obtained from visco-elastic analyses shows that the alternate form for the surface is indeed simpler and therefore more usable than the results ob-tained from the analysis of rheological models. In this regard the objective of this investigation has been met.