TY - GEN
T1 - Activation energy of alkali-silica reaction in CFBC fly ash geopolymer mortars
AU - Chang-Seon, Shon
AU - Dongoun, Lee
N1 - Publisher Copyright:
© 2017 Trans Tech Publications, Switzerland.
PY - 2017
Y1 - 2017
N2 - The utilization of fly ashes produced by circulated fluidized bed combustion (CFBC) has been limited in construction application due to their inherent high sulfate and carbon contents although CFBC fly ash exhibits very good binding properties without requiring any supplementary activator. This study reports alkali silica reaction (ASR) behavior of CFBC fly ash geopolymer mortars in terms of activation energy using a modified ASTM C 1260/C 1567. Two different strengths of NaOH solution were used to test reactive and potentially reactive aggregates in the presence of CFBC fly ash. The other variables included a longer test period of 3 months and three different temperatures, namely 60°C, 70°C, and 80°C. It was observed that there was no significant expansion in CFBC fly ash based geopolymer mortar regardless of variation of temperature and alkalinity of test solution. Activation energy of CFBC fly ash geopolymer for ASR was higher than that of plain cement mortar irrespective of strength of NaOH solution.
AB - The utilization of fly ashes produced by circulated fluidized bed combustion (CFBC) has been limited in construction application due to their inherent high sulfate and carbon contents although CFBC fly ash exhibits very good binding properties without requiring any supplementary activator. This study reports alkali silica reaction (ASR) behavior of CFBC fly ash geopolymer mortars in terms of activation energy using a modified ASTM C 1260/C 1567. Two different strengths of NaOH solution were used to test reactive and potentially reactive aggregates in the presence of CFBC fly ash. The other variables included a longer test period of 3 months and three different temperatures, namely 60°C, 70°C, and 80°C. It was observed that there was no significant expansion in CFBC fly ash based geopolymer mortar regardless of variation of temperature and alkalinity of test solution. Activation energy of CFBC fly ash geopolymer for ASR was higher than that of plain cement mortar irrespective of strength of NaOH solution.
KW - Activation energy
KW - Alkali silica reaction
KW - Circulating fluidized bed combustion fly ash
KW - Geopolymer
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UR - http://www.scopus.com/inward/citedby.url?scp=85011320421&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/MSF.882.77
DO - 10.4028/www.scientific.net/MSF.882.77
M3 - Conference contribution
AN - SCOPUS:85011320421
SN - 9783038357322
T3 - Materials Science Forum
SP - 77
EP - 82
BT - Manufacturing Sciences and Technologies VII
A2 - Debnath, Sujan
PB - Trans Tech Publications
T2 - 7th International Conference on Manufacturing Science and Technology, ICMST 2016
Y2 - 16 July 2016 through 18 July 2016
ER -