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Polycarboxylate and polyether admixture compatibility with different cement compositons
Three admixtures (PC1, PC2, and PC3) with different CA (carboxylate) and PE (polyether) group contents were used, along with seven standard cements whose chemical and mineralogical compositions and active additions varied. The structural characteristic of the admixtures affecting compatibility most intensely was found to be the carboxylate (CA) to polyether (PE) group ratio. In cements with no active additions, characteristics such as fineness and the (3CaO)(Al2O3) to calcium sulphate and (3CaO)(SiO2) to (3CaO)(Al2O3) ratios were also observed to have marked effect on compatibility. On the other hand, in cements with limestone or fly ash additions, no fundamental differences were identified with respect to a standard CEM I 42.5R cement in terms of admixture compatiblity. In CAC (calcium aluminate cement) the fluidizing effect of polycarboxylate superplasticizers led to very significant declines in yield stress.
Polycarboxylate and polyether admixture compatibility with different cement compositons
Three admixtures (PC1, PC2, and PC3) with different CA (carboxylate) and PE (polyether) group contents were used, along with seven standard cements whose chemical and mineralogical compositions and active additions varied. The structural characteristic of the admixtures affecting compatibility most intensely was found to be the carboxylate (CA) to polyether (PE) group ratio. In cements with no active additions, characteristics such as fineness and the (3CaO)(Al2O3) to calcium sulphate and (3CaO)(SiO2) to (3CaO)(Al2O3) ratios were also observed to have marked effect on compatibility. On the other hand, in cements with limestone or fly ash additions, no fundamental differences were identified with respect to a standard CEM I 42.5R cement in terms of admixture compatiblity. In CAC (calcium aluminate cement) the fluidizing effect of polycarboxylate superplasticizers led to very significant declines in yield stress.
Polycarboxylate and polyether admixture compatibility with different cement compositons
Kompatibilität von Polycarboxylat- und Polyetherzusatzstoffen mit verschiedenen Zementzusammensetzungen
Alonso, M.M. (author) / Puertas, F. (author) / Palacios, M. (author)
2009
20 Seiten, 6 Bilder, 10 Tabellen, 33 Quellen
Conference paper
English
SP-262-4 Polycarboxylate and Polyether Admixture Compatibility with Different Cement Compositons
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