Evaluation of failure criteria of shrinkage cracking for restrained concrete

Title: Evaluation of failure criteria of shrinkage cracking for restrained concrete
Author(s): Manabu Ohya, Toyoharu Nawa
Paper category : conference
Book title: International RILEM Conference on Volume Changes of Hardening Concrete: Testing and Mitigation
Editor(s): O. M. Jensen, P. Lura, K. Kovler
Print-ISBN: 2-35158-004-4
e-ISBN: 2351580052
Publisher: RILEM Publications SARL
Publication year: 2006
Pages: 215 - 221
Total Pages: 7
Nb references: 6
Language: English

Abstract: Early age cracking associated with autogenous and drying shrinkage is a well known phenomenon. Normally the cracks induced by autogenous shrinkage can occur in few days after setting. In order to solve this problem, reliable analysis and evaluation method for cracking behavior that leads to accurate prediction and control of cracking is needed. In other words, the quantification of failure criteria is indispensable. Comprehensive information are needed to determine whether the tensile stress meets failure criteria or not. However, up to now, traditional methods can not exactly evaluate these failure criteria because the measured stress is discontinuous. To quantify the failure criteria, a shrinkage-cracking test with high degree of accuracy has been carried out of using a new type of continuous load control testing machine (CLCTM) which controls the degree of restrain. In this study, to apply an elastic material embedded in the mega-torque motor of this device, the stress induced in hardened mortar by autogenous shrinkage and drying shrinkages can be smoothly changed to represent actual structure represents. This paper discusses the criteria of shrinkage cracks in cement blended with granulated blast furnace slag to clear the mechanism of cracking.

Online publication: 2006-07-30
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2351580052.023