Smart Polycarboxylate Design for SCC in Precast Applications
Concretes for self-compacting concrete (SCC) applications have to combine a high fluidity and fluidity retention with high segregation resistance. This optimal rheological behaviour is obtained by combining a suitable aggregate grading curve with correct rheological properties of the suspending matrix (i.e. the cement paste). It is shown in this paper how these rheological properties can be influenced by polycarboxylate-based superplasticizers. Furthermore it is shown that relatively easy tests can be used to access the rheological properties of both the fresh cement paste and the concrete quantitatively. It is demonstrated that a new superplasticizer leads to an improved robustness in the formulation of SCC.
KeywordsShear Rate Rheological Property Fresh Concrete Limestone Powder Slump Flow
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