Application of Deflocculation Test to Characterise the Admixture Plasticizer and Superplasticizer Effect in Different Cements

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Title: Application of Deflocculation Test to Characterise the Admixture Plasticizer and Superplasticizer Effect in Different Cements

Author(s): A. Macias and S. Goni

Publication: Special Publication

Volume: 173

Issue:

Appears on pages(s): 807-834

Keywords: Admixtures; cements; plasticizers; superplasticizers; tests

Date: 9/1/1997

Abstract:
A deflocculation test based on the method proposed by A. Verhasselt and J. Pairon has been applied to different mixes of cement-admixtures in order tc distinguish quickly between plasticizer and superplasticizer. The admixtures used were commercial products containing different proportions of lignosulphonates (L), sulphonated naphthalene formaldehydecondensate (SNF) and sulphonated melamine formaldehyde condensate (SMF). Three different cements were employed: a low tricalcium aluminate (C3 A = 2.5 %), a high alkali content (Na2 O equivalent = 0.95%) and a high fineness Portland cement (S.A. Blaine = 5002 cm2/gr). In addition, the minimum active dosage of superplasticizer was calculated. The influence of the type of cement in the minimum active dosage is clearly shown by the results obtained through this method.