Title: Influence of Cement and Plasticizer Type on the Rheology and Reactivity of Cementitious Binders

Author(s): H. Vikan, H. Justnes, and R. Figi

Publication: Symposium Paper

Volume: 239

Issue:

Appears on pages(s): 455-470

Keywords: adsorption; cement; lignosulfonate; plasticizers; polyacrylate; rheology; sulfonated naphthalene formaldehyde condensate

DOI: 10.14359/18396

Date: 10/1/2006

Abstract:
The interactions between six commercial cements and three types of plasticizers, namely naphthalene sulfonate formaldehyde condensate (SNF), lignosulfonate (LS) and polyacrylate grafted with polyether (PA) are investigated using cement paste. PA was found to be the most efficient plasticizer of the three tested even though it was found to present lower adsorption onto cement than SNF and LS. SNF and LS brought about comparable results. PA was observed to induce flow gain of pastes within 2 hours of rheological measurements, while pastes made with SNF and LS exhibited flow loss as a function of time. The adsorption characteristics were found to depend on the plasticizer type. The plasticizer saturation dosages were, moreover, found to depend on cement surface area (Blaine fineness), amount of cubic C3A and soluble sulfates.