A new approach for the determination of the starting point of autogenous shrinkage strains (ASS)

M. S. Meddah, P. C. Aïtcin, N. Petrov

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

10 Citations (Scopus)

Abstract

The determination of the starting point of autogenous shrinkage strains is still a point of discussion within the scientific community. Several approaches, each one more or less easy to implement, have been proposed to determine this important point when dealing with low water to binder ratio (W/B) concrete. It is at this moment that external water curing must be applied to control the detrimental effects of the development of early autogenous shrinkage strains because the development of early cracking can be very detrimental for concrete durability. Concrete is continuously subjected to volumetric changes, particularly at an early age, when hydration heat and autogenous shrinkage evolve very fast. It is difficult to separate thermal and plastic shrinkage from shrinkage due to chemical contraction. In large concrete elements, it is appropriate to calculate isothermal shrinkage to reach the starting point of autogenous shrinkage. Neither the temperature criterion alone, nor the penetration resistance test can predict the starting point of autogenous shrinkage, and therefore, the risk of early-age cracking. In this research, the concept of threshold of solidification was coupled with that of temperature rise to more accurately determine the starting point of autogenous shrinkage. An experimental study on the development of isothermal shrinkage of large concrete elements made with different binders was carried out. In order to clarify the effect of the W/B on the importance of the determination of the starting point of autogenous shrinkage, concrete mixtures were made at three W/B: 0.45, 0.35 and 0.26. Isothermal shrinkage was measured using vibrating wire gauges imbedded in a large concrete element. Experimental results show the importance of the correct determination of the starting point of autogenous shrinkage when the W/B is low.

Original languageEnglish
Title of host publication7th CANMET/ACI International Conference on Durability of Concrete
EditorsV. M. Malhotra
PublisherAmerican Concrete Institute
Pages473-484
Number of pages12
ISBN (Electronic)9780870312076
Publication statusPublished - Mar 22 2006
Externally publishedYes
Event7th CANMET/ACI International Conference on Durability of Concrete 2006 - Montreal, Canada
Duration: May 28 2006Jun 3 2006

Publication series

NameAmerican Concrete Institute, ACI Special Publication
VolumeSP-234
ISSN (Print)0193-2527

Conference

Conference7th CANMET/ACI International Conference on Durability of Concrete 2006
Country/TerritoryCanada
CityMontreal
Period5/28/066/3/06

Keywords

  • Autogenous shrinkage
  • Cast-in-place concrete
  • Cementitious materials
  • Determination method
  • High-performance concrete
  • Hydration
  • Self-desiccation
  • Threshold of solidification
  • Water to binder

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

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