Effects of Superplasticizer Structure on Performance of Portland-Based Cements

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Title: Effects of Superplasticizer Structure on Performance of Portland-Based Cements

Author(s): Lidia Eusebio, Andrea Casali, Marco Goisis, Giuseppe Manganelli, and Paolo Gronchi

Publication: Special Publication

Volume: 288

Issue:

Appears on pages(s): 1-14

Keywords: adsorption, blended cement, comb-polymer, mini slump test, pozzolan, slag, superplasticizer

Date: 9/14/2012

Abstract:
To reduce CO2 emission, portland clinker in industrial cement is substituted by reactive and nonreactive mineral additions. This research examines the effect of the structure of selected polymers on their dispersing activity on three different matrixes: portland cement (CEM I 52.5R), portland slag cement (CEM II/B-S 42.5N) and pozzolanic cement (CEM IV/A-P 42.5R). The role of the length of the main parts of a typical comb-polymer on its adsorption behavior and deflocculating capability has been evaluated. For the purpose different poly¬mers having Mw of polyacrylic backbone equal to 2000 and 5000Da and methoxy-PEO dispersing side chains equal to 1000 and 3000 Da were synthesized. Esterification ratio was fixed at 30%. Adsorption isotherms were evaluated by TOC technique while dispersing behavior by mini-slump test. It results that dimension of superplasticizer has a remarkable role on dispersing ability particularly in the case of pozzolanic cement.