Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Effects of slag characteristics on sulfate durability of Portland cement-slag blended systems
https://orcid.org/0000-0002-9088-7316
Highlights Sulfate durability of GGBFS generally decreased with increasing its Al2O3 content. Sulfate durability of GGBFS improved with increasing MgO/Al2O3 ratio of slag. Solid volume increase of hydration products is linearly related to MgO/Al2O3 ratio. Solid volume increase appears to be related to the length of the induction period. Increasing slag fineness appears to decrease slag sulfate resistance.
Abstract Sulfate resistance of Portland cement-slag mixtures was compared at 30, 50 and 70% cement replacement levels for slags with variable Al2O3 and MgO content and variable fineness in combination with moderate- and high-C3A cements. Sulfate resistance generally decreased with increasing slag Al2O3 content, although decreasing MgO also increased deterioration, particularly at 30% replacement. Increase in Al2O3 correlated with increased formation of secondary ettringite in the surface of the bars. A linear relationship was observed between the solid volume increase on exposure to sulfate solution predicted by GEMS and the MgO/Al2O3 ratio of slag at all cement replacement levels. There was also a linear relationship between the solid volume increase and the length of the induction period for the mortar bars exposed to sulfate solution.
Effects of slag characteristics on sulfate durability of Portland cement-slag blended systems
https://orcid.org/0000-0002-9088-7316
Highlights Sulfate durability of GGBFS generally decreased with increasing its Al2O3 content. Sulfate durability of GGBFS improved with increasing MgO/Al2O3 ratio of slag. Solid volume increase of hydration products is linearly related to MgO/Al2O3 ratio. Solid volume increase appears to be related to the length of the induction period. Increasing slag fineness appears to decrease slag sulfate resistance.
Abstract Sulfate resistance of Portland cement-slag mixtures was compared at 30, 50 and 70% cement replacement levels for slags with variable Al2O3 and MgO content and variable fineness in combination with moderate- and high-C3A cements. Sulfate resistance generally decreased with increasing slag Al2O3 content, although decreasing MgO also increased deterioration, particularly at 30% replacement. Increase in Al2O3 correlated with increased formation of secondary ettringite in the surface of the bars. A linear relationship was observed between the solid volume increase on exposure to sulfate solution predicted by GEMS and the MgO/Al2O3 ratio of slag at all cement replacement levels. There was also a linear relationship between the solid volume increase and the length of the induction period for the mortar bars exposed to sulfate solution.
Effects of slag characteristics on sulfate durability of Portland cement-slag blended systems
https://orcid.org/0000-0002-9088-7316
Highlights Sulfate durability of GGBFS generally decreased with increasing its Al2O3 content. Sulfate durability of GGBFS improved with increasing MgO/Al2O3 ratio of slag. Solid volume increase of hydration products is linearly related to MgO/Al2O3 ratio. Solid volume increase appears to be related to the length of the induction period. Increasing slag fineness appears to decrease slag sulfate resistance.
Abstract Sulfate resistance of Portland cement-slag mixtures was compared at 30, 50 and 70% cement replacement levels for slags with variable Al2O3 and MgO content and variable fineness in combination with moderate- and high-C3A cements. Sulfate resistance generally decreased with increasing slag Al2O3 content, although decreasing MgO also increased deterioration, particularly at 30% replacement. Increase in Al2O3 correlated with increased formation of secondary ettringite in the surface of the bars. A linear relationship was observed between the solid volume increase on exposure to sulfate solution predicted by GEMS and the MgO/Al2O3 ratio of slag at all cement replacement levels. There was also a linear relationship between the solid volume increase and the length of the induction period for the mortar bars exposed to sulfate solution.
Effects of slag characteristics on sulfate durability of Portland cement-slag blended systems
Nosouhian, Farzaneh (Autor:in) / Fincan, Mustafa (Autor:in) / Shanahan, Natallia (Autor:in) / Stetsko, Yuri P. (Autor:in) / Riding, Kyle A. (Autor:in) / Zayed, A. (Autor:in)
03.09.2019
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
High sulfate-resistant slag portland cement
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