Title:
Effects Of Superplasticizers
Author(s):
Dan Ravina, Avi Mor
Publication:
Concrete International
Volume:
8
Issue:
7
Appears on pages(s):
53-55
Keywords:
DOI:
Date:
7/1/1986
Abstract:
The effect of superplasticizer (sulfonated melamine-formaldehyde condensate) on the consistency of concrete mixes is time-related. As a result, rapid slump loss may occur particularly under hot weather conditions. In this research, the effect of dosage, time of incorporation, and a second addition of superplasticizer on the consistency of prolonged mixed concrete was studied as a function of time under elevated temperature condition. It was found that the effective necessary dosage falls within the upper recommended range as lower dosages may have no effect at all. Late incorporation and a second addition, even of a small dosage to concrete with first high dosage, can be effective, also under hot weather conditons.