What do you think how important, for segregation coefficient of SCC, could be very small superplasticizer overlaps during the process of making SCC? I made some observations in my work:
Article Some physical-mechanical characteristics of self- compacting concrete
http://www.jsce.or.jp/committee/concrete/e/newsletter/newsletter01/recommendation/selfcompact/1.pdf
The aforementioned occurrence could be significant, related to very small overdoses of superplasticizers. For example when developing concrete in the mixer. If the mixer were not to be washed out after every mixture, an overdose of the superplasticizer would occur resulting in the ″foaming″ of concrete.
The recorded occurrence could result in significantly lower compressive strength of concrete in its upper surface at incorporation. This leads to the conclusion that proper and accurate dosing of superplasticizers during the development of self-compacting concrete bears high significance.
http://www.jsce.or.jp/committee/concrete/e/newsletter/newsletter01/recommendation/selfcompact/1.pdf
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