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24. Predicting SCC workability by nano-engineering concrete



Title: 24. Predicting SCC workability by nano-engineering concrete
Author(s): M.R. de Rooij, A.L.A. Fraaij
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: 169 - 174
Total Pages: 6
Nb references: 6
Language: English


Abstract: Self-compacting concrete (SCC) has brought about a real revolution for the workability and concrete placing. After the first steps about twenty years ago, the use of SCC has rapidly taken over the placing areas where all parameters could be well controlled, like in the prefabrication industry. However, in the more variable world of ready mix concrete still unexplainable effects happen on a daily basis. Part of the problem might be that concrete is made according to recipes, after which the produced concrete is tested (in small scale, in the laboratory).
At Delft University of Technology a program has started to predict the outcome in workability terms before the concrete has been mixed. In this program over the past years initial experiments have shown the potential of this approach. The current paper describes the general theoretical framework as well as the results of initial experiments. For example it is shown that the workability can be increased up to the point of segregation and then by changing cement paste characteristics the high workability remains but then without the segregation.


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