SCC
Posted by Rosa on January 30, 2007
The main problem of SCC is the little workability, How I can increase it ? I think I would add retarding mixtures, is it a good idea?
You can increase the workability of the concrete using a “High range water reducing admixture”. A pure retarding admixture will only delay the set time of the concrete and not increase the workability. If you are looking to increase the workability and also maintain the fluidity of the concrete mix for a while you have to use a “High range water reducing and retarding admixture”.
Make sure that the concrete mix has enough fines in the form of sand and cementitious materials or fillers to avoid bleeding and segregation. If needed you can add a viscosity modifying admixture to improve the rheology of the concrete mix and reduce the chances of segregation.
