TY - GEN
T1 - Structure and properties of NaOH activated cement free binder (CFB) concretes
AU - Ravikumar, Deepak
AU - Peethamparan, Sulapha
AU - Neithalath, Narayanan
N1 - Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2009
Y1 - 2009
N2 - Increasing emphasis on sustainability of the built environment has resulted in attempts to drastically reduce the cement consumption in concrete and replace it with waste/recycled materials. This study reports the development of concretes with cement free binders (CFB) and the evaluation of their properties. A Class F fly ash and a ground granulated blast furnace slag (GGBFS) are used as the binding materials. The activating agent used in this study is sodium hydroxide (NaOH), at concentrations ranging from 6 M to 10 M. The optimal temperature and curing duration required to achieve desirable compressive strengths of CFB concretes are reported. The influence of the binding material and the concentration of the activator on the compressive strength and porosity of the CFB concretes are studied. The compressive strength of CFB concretes with fly ash as the binding material increases with increase of activating solution concentration but for CFB concretes with GGFBS as the binder, activation with 8 M NaOH is seen to result in the highest compressive strength. The strength-porosity relationship of CFB concretes shows an exponential trend, similar to that of conventional cement based materials. Microstructure and the phase composition of the reaction products are also discussed.
AB - Increasing emphasis on sustainability of the built environment has resulted in attempts to drastically reduce the cement consumption in concrete and replace it with waste/recycled materials. This study reports the development of concretes with cement free binders (CFB) and the evaluation of their properties. A Class F fly ash and a ground granulated blast furnace slag (GGBFS) are used as the binding materials. The activating agent used in this study is sodium hydroxide (NaOH), at concentrations ranging from 6 M to 10 M. The optimal temperature and curing duration required to achieve desirable compressive strengths of CFB concretes are reported. The influence of the binding material and the concentration of the activator on the compressive strength and porosity of the CFB concretes are studied. The compressive strength of CFB concretes with fly ash as the binding material increases with increase of activating solution concentration but for CFB concretes with GGFBS as the binder, activation with 8 M NaOH is seen to result in the highest compressive strength. The strength-porosity relationship of CFB concretes shows an exponential trend, similar to that of conventional cement based materials. Microstructure and the phase composition of the reaction products are also discussed.
KW - Fly ash
KW - Ground granulated blast furnace slag (GGBFS)
KW - Porosity
KW - Sodium hydroxide (NaOH)
KW - Strength
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U2 - 10.1533/9781845697754.169
DO - 10.1533/9781845697754.169
M3 - Conference contribution
AN - SCOPUS:84874772511
SN - 9781845697754
T3 - Brittle Matrix Composites 9, BMC 2009
SP - 169
EP - 182
BT - Brittle Matrix Composites 9, BMC 2009
PB - Woodhead Publishing Limited
T2 - 9th International Symposium on Brittle Matrix Composites, BMC 2009
Y2 - 25 October 2009 through 28 October 2009
ER -