TY - JOUR
T1 - Structure and strength of NaOH activated concretes containing fly ash or GGBFS as the sole binder
AU - Ravikumar, Deepak
AU - Peethamparan, Sulapha
AU - Neithalath, Narayanan
N1 - Funding Information:
This study was partly funded by the Green and Energy Efficient Building Products and Systems program of the New York State Energy Research and Development Authority (NYSERDA). The materials for this study were provided by Holcim Cement and Graymont Materials. A part of the experimental study was carried out at the facilities of the Center for Advanced Materials Processing (CAMP) at Clarkson University. The authors acknowledge all these entities for the support.
Copyright:
Copyright 2010 Elsevier B.V., All rights reserved.
PY - 2010/7
Y1 - 2010/7
N2 - The influence of the concentration of the activating agent (4, 6, or 8 M sodium hydroxide solution), and activator-to-binder ratio (0.40, 0.50, or 0.60) on the compressive strengths, pore structure features, and microstructure of concretes containing Class F fly ash or ground granulated blast furnace slag (GGBFS) as the sole binder is reported. The starting material contents and the curing parameters (temperature and curing duration) are optimized to provide the highest compressive strengths. Statistical analysis of the compressive strength results show that the activator concentration has a larger influence on the compressive strengths of activated concretes made using fly ash and the activator-to-binder ratio influences the compressive strengths of activated GGBFS concretes to a greater degree. Activated fly ash concretes and pastes are found to be more porous and contains a larger fraction of pores greater than 10 μm in size as compared to activated GGBFS mixtures. The differences in the microstructure and the reaction products between activated fly ash and GGBFS pastes are detailed.
AB - The influence of the concentration of the activating agent (4, 6, or 8 M sodium hydroxide solution), and activator-to-binder ratio (0.40, 0.50, or 0.60) on the compressive strengths, pore structure features, and microstructure of concretes containing Class F fly ash or ground granulated blast furnace slag (GGBFS) as the sole binder is reported. The starting material contents and the curing parameters (temperature and curing duration) are optimized to provide the highest compressive strengths. Statistical analysis of the compressive strength results show that the activator concentration has a larger influence on the compressive strengths of activated concretes made using fly ash and the activator-to-binder ratio influences the compressive strengths of activated GGBFS concretes to a greater degree. Activated fly ash concretes and pastes are found to be more porous and contains a larger fraction of pores greater than 10 μm in size as compared to activated GGBFS mixtures. The differences in the microstructure and the reaction products between activated fly ash and GGBFS pastes are detailed.
KW - Cement-free binder
KW - Compressive strength
KW - Fly ash
KW - Granulated blast furnace slag
KW - Microstructure
KW - Pore size
KW - Porosity
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U2 - 10.1016/j.cemconcomp.2010.03.007
DO - 10.1016/j.cemconcomp.2010.03.007
M3 - Article
AN - SCOPUS:77953132330
VL - 32
SP - 399
EP - 410
JO - Cement and Concrete Composites
JF - Cement and Concrete Composites
SN - 0958-9465
IS - 6
ER -