82. Evaluation of the risk for early thermal cracking in SCC

Title: 82. Evaluation of the risk for early thermal cracking in SCC
Author(s): S. Utsi, J.E. Jonasson
Paper category : conference
Book title: 5th International RILEM Symposium on Self-Compacting Concrete
Editor(s): G. De Schutter and V. Boel
Print-ISBN: 978-2-35158-047-9
e-ISBN: 978-2-35158-088-2
Publisher: RILEM Publications SARL
Publication year: 2007
Pages: 545 - 551
Total Pages: 7
Nb references: 9
Language: English

Abstract: This study is focused on SCC (Self-Compacting Concrete) recipes for civil engineering applications and particularly on the early age properties needed for early age crack risk analyses. The concrete mixes for testing have been chosen to be acceptable robust due to variations in some SCC mix parameters with respect to consistency parameters in the fresh stage. One of the main questions is whether these SCC mixes are more or less sensible to early thermal cracking compared with corresponding TC (Traditional Concretes, i.e. when vibration is necessary).
It turned out that the SCC mixes in some cases had lower tensile stress levels than the corresponding TC mixes. One possible interpretation of these SCC concretes with the lower crack potential is that they showed a significant swelling after some time. This late swelling can be clearly illustrated in the phenomenological modelling of the behaviour, when the total deformation is split in a thermal dilation part and shrinkage. Unfortunately, the mechanisms behind this behaviour are not known at present.

Online publication: 2009-06-16
Publication type : full_text
Public price (Euros): 0.00