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Structural changes in sodium carbonate activated slag binders induced by CO2 exposure.
Trabajo presentado a la 39th Cement and Concrete Science Conference, celebrada en la Universidad de Bath (UK) del 9 al 10 de septiembre de 2019. ; The physical and chemical interaction between CO2 and cementitious materials is referred to as carbonation, and is considered one of the main threats to our built environment. In alkali-activated materials, carbonation reactions can lead to significant changes in phase assemblages, an increase in porosity, and a loss in mechanical strength; however, the kinetics of carbonation are strongly dependent on factors controlling phase assemblage evolution in these systems, such as the type of precursor used in their production, the nature and amount of the activator utilised, and the curing conditions adopted. In this study the structural changes of sodium carbonate activated slag cements induced by accelerated carbonation under controlled exposure conditions (1% CO2, 65% relative humidity and 23¿C) are evaluated. The results are compared with those obtained for specimens exposed to natural carbonation conditions, to identify any changes in the type of carbonation products forming, as a function of CO2 concentration. Conversely to what has been reported for silicate activated slag systems, when using sodium carbonate as activator, negligible carbonation of the specimens is identified upon natural or accelerated carbonation. The outcomes of this study demonstrate that the development of highly durable and carbonation resistant alkali-activated cements is feasible when using sodium carbonate as the alkali source. ; This research was funded by the European Research Council under the European Union's Seventh Framework Programme (FP7/2007 2013) / ERC Grant Agreement #335928 (GeopolyConc). XK is grateful to U. Bath for her Prize Fellow ship. The participation of SAB in this research was partially funded by EPSRC through ECF EP/R001642/1.
Structural changes in sodium carbonate activated slag binders induced by CO2 exposure.
Trabajo presentado a la 39th Cement and Concrete Science Conference, celebrada en la Universidad de Bath (UK) del 9 al 10 de septiembre de 2019. ; The physical and chemical interaction between CO2 and cementitious materials is referred to as carbonation, and is considered one of the main threats to our built environment. In alkali-activated materials, carbonation reactions can lead to significant changes in phase assemblages, an increase in porosity, and a loss in mechanical strength; however, the kinetics of carbonation are strongly dependent on factors controlling phase assemblage evolution in these systems, such as the type of precursor used in their production, the nature and amount of the activator utilised, and the curing conditions adopted. In this study the structural changes of sodium carbonate activated slag cements induced by accelerated carbonation under controlled exposure conditions (1% CO2, 65% relative humidity and 23¿C) are evaluated. The results are compared with those obtained for specimens exposed to natural carbonation conditions, to identify any changes in the type of carbonation products forming, as a function of CO2 concentration. Conversely to what has been reported for silicate activated slag systems, when using sodium carbonate as activator, negligible carbonation of the specimens is identified upon natural or accelerated carbonation. The outcomes of this study demonstrate that the development of highly durable and carbonation resistant alkali-activated cements is feasible when using sodium carbonate as the alkali source. ; This research was funded by the European Research Council under the European Union's Seventh Framework Programme (FP7/2007 2013) / ERC Grant Agreement #335928 (GeopolyConc). XK is grateful to U. Bath for her Prize Fellow ship. The participation of SAB in this research was partially funded by EPSRC through ECF EP/R001642/1.
Structural changes in sodium carbonate activated slag binders induced by CO2 exposure.
Criado, María (author) / Ke, Xinyuan (author) / Provis, John L. (author) / Bernal, Susan A. (author) / Engineering and Physical Sciences Research Council (UK) / European Commission / European Research Council
2019-01-01
Conference paper
Electronic Resource
English
DDC:
690
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