A new technique for characterization of early-age cracking of mortars

Title: A new technique for characterization of early-age cracking of mortars
Author(s): V. Lamour, A. Haouas, M. Moranville, R. Schell
Paper category : conference
Book title: International RILEM Symposium on Concrete Science and Engineering: A Tribute to Arnon Bentur
Editor(s): J. Weiss, K. Kovler, J. Marchand, and S. Mindess
Print-ISBN: None
e-ISBN: 2912143926
Publisher: RILEM Publications SARL
Publication year: 2004
Nb references: 7
Language: English

Abstract: As the only data of free shrinkage was found to be insufficient to predict the risk of earlyage shrinkage cracking when the concrete element came to be restrained, we developed in this work a new technique of characterization of cracking phenomenon based on innovated ringtype specimen tests. The ring test consists of a concrete annulus that is cast around a hollow brass cylinder. As the mortar hydrates and dries, shrinkage is prevented by the ring resulting in the development of tensile stresses in concrete. With this experimental device, we were able to predict the risk of cracking in mortars. For these purpose two kinds of tests were defined: the semi-rigid ring, which allows a partial and constant restraint and the fullcompensation system, using a pressurized cylinder around which the mortar was cast. Thus, we were able to follow the growth of internal properties of the material during aging such as, free shrinkage, restrained tensile stresses and visco-elastic response, which will provide precious information for future numerical implantation. Experimental program was carried out with a broad range of mortars going from the traditional mortar to improved formulations resistant to cracking.

Online publication: 2004-03-25
Classification: Cracking
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143926.027