The present work aims to study the coupled effect of alkali concentration and metakaolin (MK) on the resistivity of ground granulated blast-furnace slag (GGBFS) to strength regression during ageing. GGBFS was activated by 6 and 10 wt., % containing mixture of sodium hydroxide (SH) and liquid sodium silicate (LSS) at a ratio of 1:1, respectively (namely GGBFS6 and GGBFS10). On the other hand, GGBFS10 was replaced by 10, 20, 30, 40 and 50 wt., % of MK, respectively. All hardened specimens were cured in 100% relative humidity (RH) at 37 ± 2°C for 28 days (zero time) then, aged at 95°C for 56 days. Experimental results showed that, the pH value of alkali activated samples (AAS) decreased as the amount of MK increased. Also, the pH of AAS derived from GGBFS10 was higher than that of GGBFS6. The strength regression resistivity (SRR) during accelerated ageing enhanced with the decrease of alkali concentration. The compressive strength for different investigated mixes was evaluated. Also, some selected hydration products were analyzed using infrared spectroscopy (FTIR), thermo-gravimetric analysis (TG/DTG) and X- ray diffraction (XRD) techniques to determine the mineralogical phase transition. The results of mechanical properties are in a good agreement with those of FTIR, TG/DTG and XRD techniques and confirm that the SRR during ageing increases with MK content.
| Published in | American Journal of Chemical Engineering (Volume 3, Issue 3) |
| DOI | 10.11648/j.ajche.20150303.11 |
| Page(s) | 30-38 |
| Creative Commons |
This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited. |
| Copyright |
Copyright © The Author(s), 2024. Published by Science Publishing Group |
Accelerated Ageing, GBFS, MK, Compressive Strength Regression, pH
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APA Style
Hamdy Abd El-Aziz Abdel Gawwad, Hesham Mohamed Khater, Saleh Abd El-Aleem Mohamed. (2015). Impact of Alkali Concentration and Metakaolin Content on Accelerated Ageing of Egyptian Slag. American Journal of Chemical Engineering, 3(3), 30-38. https://doi.org/10.11648/j.ajche.20150303.11
ACS Style
Hamdy Abd El-Aziz Abdel Gawwad; Hesham Mohamed Khater; Saleh Abd El-Aleem Mohamed. Impact of Alkali Concentration and Metakaolin Content on Accelerated Ageing of Egyptian Slag. Am. J. Chem. Eng. 2015, 3(3), 30-38. doi: 10.11648/j.ajche.20150303.11
AMA Style
Hamdy Abd El-Aziz Abdel Gawwad, Hesham Mohamed Khater, Saleh Abd El-Aleem Mohamed. Impact of Alkali Concentration and Metakaolin Content on Accelerated Ageing of Egyptian Slag. Am J Chem Eng. 2015;3(3):30-38. doi: 10.11648/j.ajche.20150303.11
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Download@article{10.11648/j.ajche.20150303.11,
author = {Hamdy Abd El-Aziz Abdel Gawwad and Hesham Mohamed Khater and Saleh Abd El-Aleem Mohamed},
title = {Impact of Alkali Concentration and Metakaolin Content on Accelerated Ageing of Egyptian Slag},
journal = {American Journal of Chemical Engineering},
volume = {3},
number = {3},
pages = {30-38},
doi = {10.11648/j.ajche.20150303.11},
url = {https://doi.org/10.11648/j.ajche.20150303.11},
eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajche.20150303.11},
abstract = {The present work aims to study the coupled effect of alkali concentration and metakaolin (MK) on the resistivity of ground granulated blast-furnace slag (GGBFS) to strength regression during ageing. GGBFS was activated by 6 and 10 wt., % containing mixture of sodium hydroxide (SH) and liquid sodium silicate (LSS) at a ratio of 1:1, respectively (namely GGBFS6 and GGBFS10). On the other hand, GGBFS10 was replaced by 10, 20, 30, 40 and 50 wt., % of MK, respectively. All hardened specimens were cured in 100% relative humidity (RH) at 37 ± 2°C for 28 days (zero time) then, aged at 95°C for 56 days. Experimental results showed that, the pH value of alkali activated samples (AAS) decreased as the amount of MK increased. Also, the pH of AAS derived from GGBFS10 was higher than that of GGBFS6. The strength regression resistivity (SRR) during accelerated ageing enhanced with the decrease of alkali concentration. The compressive strength for different investigated mixes was evaluated. Also, some selected hydration products were analyzed using infrared spectroscopy (FTIR), thermo-gravimetric analysis (TG/DTG) and X- ray diffraction (XRD) techniques to determine the mineralogical phase transition. The results of mechanical properties are in a good agreement with those of FTIR, TG/DTG and XRD techniques and confirm that the SRR during ageing increases with MK content.},
year = {2015}
}
TY - JOUR T1 - Impact of Alkali Concentration and Metakaolin Content on Accelerated Ageing of Egyptian Slag AU - Hamdy Abd El-Aziz Abdel Gawwad AU - Hesham Mohamed Khater AU - Saleh Abd El-Aleem Mohamed Y1 - 2015/06/19 PY - 2015 N1 - https://doi.org/10.11648/j.ajche.20150303.11 DO - 10.11648/j.ajche.20150303.11 T2 - American Journal of Chemical Engineering JF - American Journal of Chemical Engineering JO - American Journal of Chemical Engineering SP - 30 EP - 38 PB - Science Publishing Group SN - 2330-8613 UR - https://doi.org/10.11648/j.ajche.20150303.11 AB - The present work aims to study the coupled effect of alkali concentration and metakaolin (MK) on the resistivity of ground granulated blast-furnace slag (GGBFS) to strength regression during ageing. GGBFS was activated by 6 and 10 wt., % containing mixture of sodium hydroxide (SH) and liquid sodium silicate (LSS) at a ratio of 1:1, respectively (namely GGBFS6 and GGBFS10). On the other hand, GGBFS10 was replaced by 10, 20, 30, 40 and 50 wt., % of MK, respectively. All hardened specimens were cured in 100% relative humidity (RH) at 37 ± 2°C for 28 days (zero time) then, aged at 95°C for 56 days. Experimental results showed that, the pH value of alkali activated samples (AAS) decreased as the amount of MK increased. Also, the pH of AAS derived from GGBFS10 was higher than that of GGBFS6. The strength regression resistivity (SRR) during accelerated ageing enhanced with the decrease of alkali concentration. The compressive strength for different investigated mixes was evaluated. Also, some selected hydration products were analyzed using infrared spectroscopy (FTIR), thermo-gravimetric analysis (TG/DTG) and X- ray diffraction (XRD) techniques to determine the mineralogical phase transition. The results of mechanical properties are in a good agreement with those of FTIR, TG/DTG and XRD techniques and confirm that the SRR during ageing increases with MK content. VL - 3 IS - 3 ER -
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