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Drying shrinkage of concrete, can it be used for modelling autogenous shrinkage?



Title: Drying shrinkage of concrete, can it be used for modelling autogenous shrinkage?
Author(s): R. Haverkort, P. Roelfstra, E. Schlangen
Paper category : conference
Book title: International RILEM Symposium on Concrete Modelling - ConMod '08
Editor(s): E. Schlangen and G. De Schutter
Print-ISBN: 978-2-35158-060-8
e-ISBN: 978-2-35158-076-9
Publisher: RILEM Publications SARL
Publication year: 2008
Pages: 681 - 689
Total Pages: 9
Nb references: 6
Language: English


Abstract: In this article we show the results of modeling autogenous shrinkage as internal drying shrinkage with the finite element tool MLS of Femmasse. This way of modeling results in a decrease in autogenous shrinkage with increasing water/cement ratio. It also results in a reduction of autogenous shrinkage to almost zero when the specimen is allowed to take up water (cured under water). Finally it also shows a reduction in shrinkage with increasing temperatures. Something similar was measured by Lura [1].
At the macro scale we combined the hygral models with thermal and mechanical models by simulating the hardening of a 80 cm wall with water uptake and internal desiccation. This showed that the final stresses are about the same as in the classical way of simulating autogenous shrinkage, but the stress development in time differs strongly.
For these kind of simulations material data are needed. Measuring these data is too costly and too time consuming for practice purposes. Micro - meso scale models that predict the necessary characteristics can solve this problem and create more possibilities to predict stresses and crack risks in combined thermal - hygral problems more accurately.


Online publication: 2009-06-15
Publication type : full_text
Public price (Euros): 0.00