Comparison of Three Plasticizers in Carbonate-Activated Slag Concrete

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Title: Comparison of Three Plasticizers in Carbonate-Activated Slag Concrete

Author(s): Rolf Andreas Lauten

Publication: Special Publication

Volume: 320

Issue:

Appears on pages(s): 26.1-26.10

Keywords: alkali-activated slag concrete, lignosulfonate, naphthalene sulfonate, polycarboxylate, sodium carbonate, slump retention

Date: 8/1/2017

Abstract:
Characteristics of a sodium carbonate-activated slag concrete in presence of different plasticizers are presented and discussed. Inclusion of a calcined clay in the activator system allows for a more rapid curing in a system that is known to cure slowly. Depending upon the plasticizer (lignosulfonate, polycarboxylate or naphthalene sulfonate), slump retention is either improved relative to the control or inferior. Compressive strength of concrete prisms can be recorded after 24 hours, but set times determined from temperature as a function of curing time indicate longer set times. The longest slump retention is obtained with lignosulfonate, and the compressive strength at 28 days is comparable among the three plasticizers. Surprisingly, lignosulfonate appears to be as efficient as the other plasticizers when it comes to fluidization of the concrete mixes.