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The Scientific World Journal
Volume 2014, Article ID 919154, 11 pages
http://dx.doi.org/10.1155/2014/919154
Research Article

Stress-Strain Behavior of Cementitious Materials with Different Sizes

College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China

Received 30 December 2013; Accepted 19 February 2014; Published 13 March 2014

Academic Editors: A. T. Marques and C. Rambo

Copyright © 2014 Jikai Zhou et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The size dependence of flexural properties of cement mortar and concrete beams is investigated. Bazant’s size effect law and modified size effect law by Kim and Eo give a very good fit to the flexural strength of both cement mortar and concrete. As observed in the test results, a strong size effect in flexural strength is found in cement mortar than in concrete. A modification has been suggested to Li’s equation for describing the stress-strain curve of cement mortar and concrete by incorporating two different correction factors, the factors contained in the modified equation being established empirically as a function of specimen size. A comparison of the predictions of this equation with test data generated in this study shows good agreement.