Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
External sulfate attack: comparison of several alternative binders
https://orcid.org/http://orcid.org/0000-0003-3049-3769
The aim of this work was to benchmark several binders by testing their capacity to resist external sulfate attack (ESA) under similar experimental conditions. Concrete samples were fabricated from seven different binders: two Portland cements, one blast furnace slag Portland cement, one super sulfated ground granulated blast furnace slag cement, one sodium carbonate alkali-activated slag cement, one metakaolin geopolymer and one calcium sulfoaluminate-belite cement. Mechanical strength measurements were used to characterize the concretes in the hardened state. Resistance to ESA was studied by measuring the longitudinal expansion of concretes submerged in a sulfate solution. In order to better understand the behavior of the binders in ESA, this study was completed by microstructural and mineralogical analyses carried out before and after attack by using Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM/EDS), X-ray diffraction and thermodynamic calculations. It was found that ordinary Portland cement had high expansions (> 0.1%) due to the formation of excess ettringite caused by the reaction between aluminates and sulfates. Portland cement without C3A presented lower expansions but gypsum was found to be responsible for cracking at later ages. Alternative binders had low expansions, in the range of 0.01–0.03%, explained by the absence of C3A and portlandite, in addition to the formation of ettringite during hydration (case of ettringite binders) and the absence of calcium (case of the geopolymer-based metakaolin).
External sulfate attack: comparison of several alternative binders
https://orcid.org/http://orcid.org/0000-0003-3049-3769
The aim of this work was to benchmark several binders by testing their capacity to resist external sulfate attack (ESA) under similar experimental conditions. Concrete samples were fabricated from seven different binders: two Portland cements, one blast furnace slag Portland cement, one super sulfated ground granulated blast furnace slag cement, one sodium carbonate alkali-activated slag cement, one metakaolin geopolymer and one calcium sulfoaluminate-belite cement. Mechanical strength measurements were used to characterize the concretes in the hardened state. Resistance to ESA was studied by measuring the longitudinal expansion of concretes submerged in a sulfate solution. In order to better understand the behavior of the binders in ESA, this study was completed by microstructural and mineralogical analyses carried out before and after attack by using Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM/EDS), X-ray diffraction and thermodynamic calculations. It was found that ordinary Portland cement had high expansions (> 0.1%) due to the formation of excess ettringite caused by the reaction between aluminates and sulfates. Portland cement without C3A presented lower expansions but gypsum was found to be responsible for cracking at later ages. Alternative binders had low expansions, in the range of 0.01–0.03%, explained by the absence of C3A and portlandite, in addition to the formation of ettringite during hydration (case of ettringite binders) and the absence of calcium (case of the geopolymer-based metakaolin).
External sulfate attack: comparison of several alternative binders
https://orcid.org/http://orcid.org/0000-0003-3049-3769
The aim of this work was to benchmark several binders by testing their capacity to resist external sulfate attack (ESA) under similar experimental conditions. Concrete samples were fabricated from seven different binders: two Portland cements, one blast furnace slag Portland cement, one super sulfated ground granulated blast furnace slag cement, one sodium carbonate alkali-activated slag cement, one metakaolin geopolymer and one calcium sulfoaluminate-belite cement. Mechanical strength measurements were used to characterize the concretes in the hardened state. Resistance to ESA was studied by measuring the longitudinal expansion of concretes submerged in a sulfate solution. In order to better understand the behavior of the binders in ESA, this study was completed by microstructural and mineralogical analyses carried out before and after attack by using Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM/EDS), X-ray diffraction and thermodynamic calculations. It was found that ordinary Portland cement had high expansions (> 0.1%) due to the formation of excess ettringite caused by the reaction between aluminates and sulfates. Portland cement without C3A presented lower expansions but gypsum was found to be responsible for cracking at later ages. Alternative binders had low expansions, in the range of 0.01–0.03%, explained by the absence of C3A and portlandite, in addition to the formation of ettringite during hydration (case of ettringite binders) and the absence of calcium (case of the geopolymer-based metakaolin).
External sulfate attack: comparison of several alternative binders
Mater Struct
Diaz Caselles, Laura (Autor:in) / Hot, Julie (Autor:in) / Cassagnabère, Franck (Autor:in) / Cyr, Martin (Autor:in)
01.12.2021
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Ground granulated blast furnace slag , Super sulfated cement , Alkali-activated slag , Metakaolin geopolymer , Calcium sulfoaluminate cement , Ettringite Engineering , Solid Mechanics , Materials Science, general , Theoretical and Applied Mechanics , Manufacturing, Machines, Tools, Processes , Civil Engineering , Building Materials
External sulfate attack: comparison of several alternative binders
| Online Contents | 2021
Resistance to external sulfate attack - Comparison of two alkali-activated binders
| DOAJ | 2018
A model investigation of the mechanisms of external sulfate attack on portland cement binders
| British Library Online Contents | 2018
A model investigation of the mechanisms of external sulfate attack on portland cement binders
| British Library Online Contents | 2018
Alternative methodology to consider damage and expansions in external sulfate attack modeling
| Online Contents | 2014