Title: Effect of Curing on the Properties Affecting Shrinkage Cracking of Concrete Block

Author(s): J. C. Saemann, C. Warren, and G. W. Washa

Publication: Journal Proceedings

Volume: 51

Issue: 5

Appears on pages(s): 833-852

Keywords: no keywords

DOI: 10.14359/11719

Date: 5/1/1955

Abstract:
This investigation attempted to establish relationships between curing procedures and properties that influence shrinkage cracking of concrete block. Shrinkage cracks are influenced by the strength and stiffness properties of the concrete as well as its tendency to shrink because of moisture and temper-ature changes. In resisting cracking the tensile strength, notably weak for concrete, and t,he amount of strain accompanying a given stress must be considered. This latter factor is complicated by the fact that concrete tends to deform continuously at a decreasing rate under constant stress. Thus, the ratio of stress to strain is much lower when concrete sustains a load for a long time. Tests were made to determine modulus of rupture, compressive strength, tensile strength, modulus of elasticity in transverse bending, moisture volume changes, and thermal volume changes. These tests were not intended to provide results that would tell when cracking would occur and when it would not. The objective was to compare the results of tests obtained for block-type, eoncrete made with various aggregates and cured in different ways, and to tlcterminc relative immunity to cracking.