Assessing the repeatability of the restrained ring test

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

The restrained ring test is frequently used to assess the susceptibility of a concrete mixture to restrained shrinkage cracking. The test method has been recently standardized as ASTM* C 1581 (2004). Despite many useful applications of this test, concerns have been raised with respect to the repeatability and interpretation of the results when some of the rings made from a concrete mixture crack, while other specimens from the same mixture do not exhibit cracking at all. This paper provides explanation on why even in a properly performed experiment, not all the rings are always expected to crack. The work presented in this paper combines experimental and stochastic approach to analyze the repeatability of the test method and quantify variability in shrinkage measurements. In each of the experiments performed in this work, six rings were cast simultaneously from each batch of mortar prepared. Two water-tocement ratios were considered: w/c=0.30 and w/c=0.40. Additionally, the effect of shrinkage reducing admixtures on variability in the time of cracking was evaluated. The results of the experiment and the simulations are presented to explain why in a given experiment not all the rings may necessarily crack. Additionally, a probabilistic approach is used to describe the probability of cracking in a restrained concrete element. The effect of variability in material properties is included and its effect on concrete cracking prediction explained. This work can be further used by engineers as a tool to evaluate different materials performance and deliver cracking prediction. Once information about cracking probability is obtained, material properties or mixing procedures can be modified and potential for cracking minimized. As such, this approach meets the need for accurate assessment tools that can be implemented in performance-related specifications.

Original languageEnglish (US)
Title of host publicationBrittle Matrix Composites 9, BMC 2009
PublisherWoodhead Publishing Limited
Pages335-346
Number of pages12
ISBN (Print)9781845697754
DOIs
StatePublished - 2009
Event9th International Symposium on Brittle Matrix Composites, BMC 2009 - Warsaw, Poland
Duration: Oct 25 2009Oct 28 2009

Publication series

NameBrittle Matrix Composites 9, BMC 2009

Other

Other9th International Symposium on Brittle Matrix Composites, BMC 2009
CountryPoland
CityWarsaw
Period10/25/0910/28/09

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites

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