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Shrinkage

Mortars and concretes are changing its volume during setting and hardening. Many factors are influencing this mechanism: 

  • temperature changes
  • drying
  • van-der Waals forces between the small high surface particles
  • growing and shape changing of crystals
  • volume change of the aggregates
  • ...and some other known and also already unknown reasons

If the concrete is still in the fluid state, volume change doesn't matter. (maybe you get, due to the shrinkage,  some percent less cubic meters  of concrete volume then ordered). If hardening begins, shrinkage and expansion will cause inner strains. If this strain is higher then the strength  inner cracks or other may appear.  

Here you may find a survey paper about measuring the early shrinkage of mortars. This presentation was given at the Third International Drymix Mortar Conference, idmmc three, in Nürnberg, Germany, 2011 and published in the Drymix Mortar Yearbook, 2011, Editor Ferdinand Leopolder, ISBN 978-3-9814004-1-0

A presentation with the title "Testing the mechanical Properties of Drymix Mortars" heldt at the Drymix Mortar Meeting 2016 gives also a survey about shrinkage measurement.  

Another survey regarding the autogenous free and restrained shrinkage you may find in the Ph.D thesis of Sören Eppers:  Assesing the Autogenous Shrinkage Cracking Propensity of Concrete by Means of Restrained Ring Test

 

Schleibinger offers several instruments to measure this volume change from the early beginning  with high precision.

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New Product Catalog

We have updated our product catalog, now including the SLIPER, the ASTM Shrinkage Ring and the new Vane System for the Viskomat XL. Please download it here!

 

 

Change of Date!
28. Conference "Rheology of Building Materials" March, 13th 2019, Regensburg, Germany

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