Interactions between Cements with Calcined Clay and Superplasticizers

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Title: Interactions between Cements with Calcined Clay and Superplasticizers

Author(s): Jens Herrmann and Jörg Rickert

Publication: Special Publication

Volume: 302

Issue:

Appears on pages(s): 299-314

Keywords: adsorption; blended cements; calcined clay; pore solution; rheology; superplasticizer; supplementary cementitious material; zeta potential; workability

Date: 6/1/2015

Abstract:
Interactions between cements with calcined clay and superplasticizers based on polycarboxylates were investigated. All cements contained the identical clinker and sulfate carriers as well as a systematic variation of the type and proportion of calcined clay. Investigations were carried out on fresh cement paste as well as on fresh concrete by means of pore solution analyses, zeta potential experiments and rheological as well as consistency measurements. Depending on the mineralogical composition of the clay and on the calcining conditions, the specific surface area of the calcined clay varied significantly. With an increasing proportion of calcined clay in the cement, the fresh cement paste’s pore solution composition changed and, as a result, so did the zeta potential. Depending on the type and proportion of calcined clay in the cement, the specific sorption behavior of the superplasticizers diminished and consequently, their particular plasticizing effects.