Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
A multianalytical approach to understand the relationship between ASR mitigation mechanisms of class F fly ash in highly reactive systems
https://orcid.org/http://orcid.org/0000-0001-5198-7448
Over the years, the use of class F fly ash has been proven to be an efficient strategy to mitigate alkali–silica reaction (ASR) in concrete mixtures containing reactive aggregates. Prior research has identified the major mechanisms driving the mitigating action of fly ash to be, among others, alkali dilution and reduction in pore solution alkalinity due to the pozzolanic activity of fly ash. In this study, the relationship between these different mechanisms, their relative prevalence during the course of the ASR reaction, and their influence on the pore solution chemistry and nature of ASR products were explored in detail in a highly reactive model mortar system using a multi-analytical approach. Addition of fly ash to the mortar resulted in generation of fewer ASR products of similar nature than those produced in a control system. Raman spectroscopic analysis revealed the presence of aluminate monomer at the mouth of cracks in the aggregates, confirming that, in addition to the above-mentioned mechanisms, passivation of silica sites on the surface of aggregates due to the presence of aluminum in the pore solution was also a contributing factor to how fly ash mitigates ASR.
A multianalytical approach to understand the relationship between ASR mitigation mechanisms of class F fly ash in highly reactive systems
https://orcid.org/http://orcid.org/0000-0001-5198-7448
Over the years, the use of class F fly ash has been proven to be an efficient strategy to mitigate alkali–silica reaction (ASR) in concrete mixtures containing reactive aggregates. Prior research has identified the major mechanisms driving the mitigating action of fly ash to be, among others, alkali dilution and reduction in pore solution alkalinity due to the pozzolanic activity of fly ash. In this study, the relationship between these different mechanisms, their relative prevalence during the course of the ASR reaction, and their influence on the pore solution chemistry and nature of ASR products were explored in detail in a highly reactive model mortar system using a multi-analytical approach. Addition of fly ash to the mortar resulted in generation of fewer ASR products of similar nature than those produced in a control system. Raman spectroscopic analysis revealed the presence of aluminate monomer at the mouth of cracks in the aggregates, confirming that, in addition to the above-mentioned mechanisms, passivation of silica sites on the surface of aggregates due to the presence of aluminum in the pore solution was also a contributing factor to how fly ash mitigates ASR.
A multianalytical approach to understand the relationship between ASR mitigation mechanisms of class F fly ash in highly reactive systems
https://orcid.org/http://orcid.org/0000-0001-5198-7448
Over the years, the use of class F fly ash has been proven to be an efficient strategy to mitigate alkali–silica reaction (ASR) in concrete mixtures containing reactive aggregates. Prior research has identified the major mechanisms driving the mitigating action of fly ash to be, among others, alkali dilution and reduction in pore solution alkalinity due to the pozzolanic activity of fly ash. In this study, the relationship between these different mechanisms, their relative prevalence during the course of the ASR reaction, and their influence on the pore solution chemistry and nature of ASR products were explored in detail in a highly reactive model mortar system using a multi-analytical approach. Addition of fly ash to the mortar resulted in generation of fewer ASR products of similar nature than those produced in a control system. Raman spectroscopic analysis revealed the presence of aluminate monomer at the mouth of cracks in the aggregates, confirming that, in addition to the above-mentioned mechanisms, passivation of silica sites on the surface of aggregates due to the presence of aluminum in the pore solution was also a contributing factor to how fly ash mitigates ASR.
A multianalytical approach to understand the relationship between ASR mitigation mechanisms of class F fly ash in highly reactive systems
Mater Struct
Balachandran, Chandni (Autor:in) / Muñoz, Jose F. (Autor:in) / Peethamparan, Sulapha (Autor:in) / Arnold, Terence S. (Autor:in)
01.05.2024
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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