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84. The Influence of some mix design parameters on drying shrinkage of SCC



Title: 84. The Influence of some mix design parameters on drying shrinkage of SCC
Author(s): T.A. Hammer
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: 559 - 564
Total Pages: 6
Nb references: 2
Language: English


Abstract: SCC recipes are often associated with high contents of binder, fillers, fine sand and water reducing admixtures (WRA), which all may contribute to increase drying shrinkage as driving forces to cracking and curling. Thus, questions have been raised about such cracking of SCC.
The paper discusses the results from an investigation of the influence of the important mix design parameters on the drying shrinkage of typical low cost SCC for buildings (w/b = 0.60) as used in Norway. The parameters are paste volume, air content, cement type, filler type and amount, WRA type and amount, and filler- coarse aggregate ratio.
The paste content proved to be important parameters as expected: A 12 % increase of paste volume gave approximately the same increase in shrinkage (12 months drying in 50 % RH). The influence of cement type was little in spite of a relatively large difference in fineness (360 - 520 m2/kg). The filler type was, however, the most important parameter: The concrete with a lime stone filler (4 % of concrete volume) had approximately 14 % lower shrinkage at 12 months, than the equivalent concrete with a Gneiss/Granite filler. Neither type nor amount of WRA as used here showed significant influence. Addition of filler as partly replacement for coarse aggregate did not result in more shrinkage. On the contrary, a slight decrease was measured.


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