A discussion of analysis approaches for determining ‘time-zero’ from chemical shrinkage and autogenous strain measurements in cement paste

Title: A discussion of analysis approaches for determining ‘time-zero’ from chemical shrinkage and autogenous strain measurements in cement paste
Author(s): Gaurav Sant, Pietro Lura, Jason Weiss
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: 375 - 383
Total Pages: 9
Nb references: 14
Language: English

Abstract: Early-age cracking in concrete has served as an impetus for research on early-age shrinkage. The majority of these studies have focused on the development of testing procedures to measure chemical shrinkage and autogenous strain [1]. Hammer et al. [2] and Boivin et al. [3] have demonstrated that at early ages the chemical shrinkage and autogenous strain are similar. However, when the cement suspension transforms from a fluid to a solid, the chemical shrinkage and autogenous strain measurements diverge. The time of divergence between these measurements has been referred to as ‘time-zero’ (‘t0’). It denotes the time when the material starts to behave as a solid and residual stresses can begin to develop in the material. While the general concept of using the divergence between these measurements is well known, the analytical determination of this time is not well defined. In this paper, the authors investigate analysis procedures aimed at providing a reliable automated method for determining ‘time-zero’ from chemical shrinkage and autogenous strain measurement results.

Online publication: 2006-07-30
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2351580052.040