skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Interactions between fluoride ions and cement paste containing superplasticizer

Abstract

Fluoride compounds are used as fluxes in the low-temperature calcination of cement. Elution of fluoride ions after calcination decreases the fluidity of cement paste containing superplasticizers, but the mechanism of fluidity decrease is unclear. Authors investigated the effects of fluoride on cement pastes containing superplasticizers and the fluidity decrease mechanism. KF addition to cement paste containing a polycarboxylate- or naphthalenesulfonate-based superplasticizer increased the yield stress, the amount of adsorbed superplasticizer, and the solid-phase specific surface area. KF addition increased the amount of adsorbed superplasticizer for alite paste but not for Ca{sub 3}Al{sub 2}O{sub 6}-CaSO{sub 4} paste. Transmission electron microscopy found SiO{sub 2} fine particles after KF addition. In the absence of water, the increase in specific surface area with fluoride was larger in hydrated than in unhydrated cement. It is supposed that the fluidity decrease results from the preferential adsorption of superplasticizer on SiO{sub 2} particles generated by reactions between hydrated calcium silicate and fluoride ions.

Authors:
 [1];  [2]; ;  [3]
  1. Tokyo Institute of Technology, Graduate School of Science and Engineering, 2-12-1 Ookayama Meguro-ku, Tokyo (Japan)
  2. Shimane University, Department of Chemistry, Interdisciplinary Graduate School of Science and Engineering, 1060 Nishikawatsu, Matsue, Shimane (Japan)
  3. Tokyo Institute of Technology, School of Materials and Chemical Technology, 2-12-1 Ookayama Meguro-ku, Tokyo (Japan)
Publication Date:
OSTI Identifier:
22697092
Resource Type:
Journal Article
Journal Name:
Cement and Concrete Research
Additional Journal Information:
Journal Volume: 91; Other Information: Copyright (c) 2016 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0008-8846
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ADSORPTION; ALUMINIUM OXIDES; CALCIUM SILICATES; CALCIUM SULFATES; CEMENTS; FINE PARTICLES; IONS; PLASTICIZERS; SILICA; SILICON OXIDES; SPECIFIC SURFACE AREA; SULFONATES; TEMPERATURE RANGE 0065-0273 K; TRANSMISSION ELECTRON MICROSCOPY; WATER

Citation Formats

Matsuzawa, Kazuki, Atarashi, Daiki, Miyauchi, Masahiro, and Sakai, Etsuo. Interactions between fluoride ions and cement paste containing superplasticizer. United States: N. p., 2017. Web. doi:10.1016/J.CEMCONRES.2016.10.006.
Matsuzawa, Kazuki, Atarashi, Daiki, Miyauchi, Masahiro, & Sakai, Etsuo. Interactions between fluoride ions and cement paste containing superplasticizer. United States. doi:10.1016/J.CEMCONRES.2016.10.006.
Matsuzawa, Kazuki, Atarashi, Daiki, Miyauchi, Masahiro, and Sakai, Etsuo. Sun . "Interactions between fluoride ions and cement paste containing superplasticizer". United States. doi:10.1016/J.CEMCONRES.2016.10.006.
@article{osti_22697092,
title = {Interactions between fluoride ions and cement paste containing superplasticizer},
author = {Matsuzawa, Kazuki and Atarashi, Daiki and Miyauchi, Masahiro and Sakai, Etsuo},
abstractNote = {Fluoride compounds are used as fluxes in the low-temperature calcination of cement. Elution of fluoride ions after calcination decreases the fluidity of cement paste containing superplasticizers, but the mechanism of fluidity decrease is unclear. Authors investigated the effects of fluoride on cement pastes containing superplasticizers and the fluidity decrease mechanism. KF addition to cement paste containing a polycarboxylate- or naphthalenesulfonate-based superplasticizer increased the yield stress, the amount of adsorbed superplasticizer, and the solid-phase specific surface area. KF addition increased the amount of adsorbed superplasticizer for alite paste but not for Ca{sub 3}Al{sub 2}O{sub 6}-CaSO{sub 4} paste. Transmission electron microscopy found SiO{sub 2} fine particles after KF addition. In the absence of water, the increase in specific surface area with fluoride was larger in hydrated than in unhydrated cement. It is supposed that the fluidity decrease results from the preferential adsorption of superplasticizer on SiO{sub 2} particles generated by reactions between hydrated calcium silicate and fluoride ions.},
doi = {10.1016/J.CEMCONRES.2016.10.006},
journal = {Cement and Concrete Research},
issn = {0008-8846},
number = ,
volume = 91,
place = {United States},
year = {2017},
month = {1}
}