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Title: Use of CaO as an activator for producing a price-competitive non-cement structural binder using ground granulated blast furnace slag

Abstract

The use of calcium oxide (CaO) demonstrates a superior potential for the activation of ground granulated blast furnace slag (GGBFS), and it produces a higher mechanical strength than calcium hydroxide [Ca(OH){sub 2}]. The mechanical strength differences between CaO- and Ca(OH){sub 2}-activated GGBFS binders are explored using isothermal calorimetry, powder X-ray diffraction, thermogravimetric and differential thermal analysis (TGA and DTA) as well as compressive strength testing. Calcium silicate hydrate (C–S–H), Ca(OH){sub 2} and a hydrotalcite-like phase are found as reaction products in all samples. The TGA and DTA results indicate that the use of CaO produces more C–S–H, although this is not likely to be the primary cause of higher strength development in the CaO-activated GGBFS. Rather, other factors such as porosity may govern the strength at a higher order of magnitude. Significant reduction of Ca(OH){sub 2} occurs only with the use of Ca(OH){sub 2}, followed by the formation of carbonate (CaCO{sub 3}), indicating carbonation. -- Highlights: •CaO showed a better potential for the activation of GGBFS than Ca(OH){sub 2}. •Strength test, XRD, TGA/DTA and isothermal calorimetry are used. •C-S-H, Ca(OH){sub 2}, and a hydrotalcite-like phase are found in all samples. •The use of Ca(OH){sub 2} causes some degree of carbonation.

Authors:
; ; ;
Publication Date:
OSTI Identifier:
22220832
Resource Type:
Journal Article
Journal Name:
Cement and Concrete Research
Additional Journal Information:
Journal Volume: 54; Other Information: Copyright (c) 2013 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; BINDERS; BLAST FURNACES; CALCIUM CARBONATES; CALCIUM HYDROXIDES; CALCIUM OXIDES; CALCIUM SILICATES; CALORIMETRY; COMPRESSION STRENGTH; DIFFERENTIAL THERMAL ANALYSIS; POROSITY; POWDERS; THERMAL GRAVIMETRIC ANALYSIS; X-RAY DIFFRACTION

Citation Formats

Kim, Min Sik, Jun, Yubin, Lee, Changha, E-mail: clee@unist.ac.kr, and Oh, Jae Eun, E-mail: ohjaeeun@unist.ac.kr. Use of CaO as an activator for producing a price-competitive non-cement structural binder using ground granulated blast furnace slag. United States: N. p., 2013. Web. doi:10.1016/J.CEMCONRES.2013.09.011.
Kim, Min Sik, Jun, Yubin, Lee, Changha, E-mail: clee@unist.ac.kr, & Oh, Jae Eun, E-mail: ohjaeeun@unist.ac.kr. Use of CaO as an activator for producing a price-competitive non-cement structural binder using ground granulated blast furnace slag. United States. doi:10.1016/J.CEMCONRES.2013.09.011.
Kim, Min Sik, Jun, Yubin, Lee, Changha, E-mail: clee@unist.ac.kr, and Oh, Jae Eun, E-mail: ohjaeeun@unist.ac.kr. Sun . "Use of CaO as an activator for producing a price-competitive non-cement structural binder using ground granulated blast furnace slag". United States. doi:10.1016/J.CEMCONRES.2013.09.011.
@article{osti_22220832,
title = {Use of CaO as an activator for producing a price-competitive non-cement structural binder using ground granulated blast furnace slag},
author = {Kim, Min Sik and Jun, Yubin and Lee, Changha, E-mail: clee@unist.ac.kr and Oh, Jae Eun, E-mail: ohjaeeun@unist.ac.kr},
abstractNote = {The use of calcium oxide (CaO) demonstrates a superior potential for the activation of ground granulated blast furnace slag (GGBFS), and it produces a higher mechanical strength than calcium hydroxide [Ca(OH){sub 2}]. The mechanical strength differences between CaO- and Ca(OH){sub 2}-activated GGBFS binders are explored using isothermal calorimetry, powder X-ray diffraction, thermogravimetric and differential thermal analysis (TGA and DTA) as well as compressive strength testing. Calcium silicate hydrate (C–S–H), Ca(OH){sub 2} and a hydrotalcite-like phase are found as reaction products in all samples. The TGA and DTA results indicate that the use of CaO produces more C–S–H, although this is not likely to be the primary cause of higher strength development in the CaO-activated GGBFS. Rather, other factors such as porosity may govern the strength at a higher order of magnitude. Significant reduction of Ca(OH){sub 2} occurs only with the use of Ca(OH){sub 2}, followed by the formation of carbonate (CaCO{sub 3}), indicating carbonation. -- Highlights: •CaO showed a better potential for the activation of GGBFS than Ca(OH){sub 2}. •Strength test, XRD, TGA/DTA and isothermal calorimetry are used. •C-S-H, Ca(OH){sub 2}, and a hydrotalcite-like phase are found in all samples. •The use of Ca(OH){sub 2} causes some degree of carbonation.},
doi = {10.1016/J.CEMCONRES.2013.09.011},
journal = {Cement and Concrete Research},
issn = {0008-8846},
number = ,
volume = 54,
place = {United States},
year = {2013},
month = {12}
}