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Title: Preparation and characterization of a hybrid alkaline binder based on a fly ash with no commercial value

Abstract

Alkali-activated Portland fly ash cement (FA/OPC) and alkali activated blast furnace slag-fly ash cement (FA/GBFS) were prepared using 70% of a low quality fly ash (FA). The low quality is associated with a high content of unburned material (loss of ignition of 14.6%). The hybrid cements were activated by the alkaline solution in order to obtain an overall SiO 2/Al 2O 3 molar ratio of 5.0 and 6.0 and unique overall Na 2O/SiO 2 molar ratio of 0.21. The microstructural characterization of the blended pastes generated in the systems showed the coexistence of amorphous gels C-A-S-H and N-A-S-H gels in the hybrid systems. The addition of OPC or GBFS increases the compressive strength (at 28 days of curing) up to 127% compared with the geopolymer systems based only on FA used in this study. The content of silicates soluble also plays an important role in the reaction products and higher SiO 2/Al 2O 3 lead to obtain higher mechanical performance and denser structure. The results obtained show that these hybrid cements are an effective way for valorization the waste used in this study for the production of high strength and low-carbon footprint cement-type material.

Authors:
ORCiD logo [1];  [1];  [1];  [2]
  1. Univ. del Valle, Cali (Colombia). Composites Materials Group (CENM)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1364291
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Journal of Cleaner Production
Additional Journal Information:
Journal Volume: 104; Journal Issue: C; Journal ID: ISSN 0959-6526
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Fly ash; Blast furnace slag; Ordinary Portland Cement; Hybrid alkaline cement

Citation Formats

Mejia, Johanna M., Rodriguez, Erich, Mejia de Gutierrez, Ruby, and Gallego, Nidia. Preparation and characterization of a hybrid alkaline binder based on a fly ash with no commercial value. United States: N. p., 2015. Web. doi:10.1016/j.jclepro.2015.05.044.
Mejia, Johanna M., Rodriguez, Erich, Mejia de Gutierrez, Ruby, & Gallego, Nidia. Preparation and characterization of a hybrid alkaline binder based on a fly ash with no commercial value. United States. doi:10.1016/j.jclepro.2015.05.044.
Mejia, Johanna M., Rodriguez, Erich, Mejia de Gutierrez, Ruby, and Gallego, Nidia. Mon . "Preparation and characterization of a hybrid alkaline binder based on a fly ash with no commercial value". United States. doi:10.1016/j.jclepro.2015.05.044.
@article{osti_1364291,
title = {Preparation and characterization of a hybrid alkaline binder based on a fly ash with no commercial value},
author = {Mejia, Johanna M. and Rodriguez, Erich and Mejia de Gutierrez, Ruby and Gallego, Nidia},
abstractNote = {Alkali-activated Portland fly ash cement (FA/OPC) and alkali activated blast furnace slag-fly ash cement (FA/GBFS) were prepared using 70% of a low quality fly ash (FA). The low quality is associated with a high content of unburned material (loss of ignition of 14.6%). The hybrid cements were activated by the alkaline solution in order to obtain an overall SiO2/Al2O3 molar ratio of 5.0 and 6.0 and unique overall Na2O/SiO2 molar ratio of 0.21. The microstructural characterization of the blended pastes generated in the systems showed the coexistence of amorphous gels C-A-S-H and N-A-S-H gels in the hybrid systems. The addition of OPC or GBFS increases the compressive strength (at 28 days of curing) up to 127% compared with the geopolymer systems based only on FA used in this study. The content of silicates soluble also plays an important role in the reaction products and higher SiO2/Al2O3 lead to obtain higher mechanical performance and denser structure. The results obtained show that these hybrid cements are an effective way for valorization the waste used in this study for the production of high strength and low-carbon footprint cement-type material.},
doi = {10.1016/j.jclepro.2015.05.044},
journal = {Journal of Cleaner Production},
issn = {0959-6526},
number = C,
volume = 104,
place = {United States},
year = {2015},
month = {5}
}