Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Influence of Portland-limestone cement composition on sulfate attack performance
This research evaluates the sulfate attack performance of Portland-limestone cements (PLCs) with varying limestone compositions. Specimens prepared by replacing Type I/II and Type V cement with up to 20% limestone powders and fly ash are examined for their sulfate resistance in sodium and magnesium sulfate solutions at 5 °C and 23 °C by expansion measurements, an accelerated strength test, visual observations, and X-ray diffraction. For the materials tested, higher calcitic limestone contents increased expansion up to 290% with 20% limestone when added to Type I/II cement but decreased expansion up to 48% with 14.6% limestone (calcitic + dolomitic) when added to Type V cement. Strength loss was not proportional to the percentage of limestone added to the cements. Dolomitic limestone improved sulfate resistance as indicated by increased strength development in magnesium sulfate and reduced expansion in both solutions. Ettringite, thaumasite, gypsum, and brucite were the main sulfate attack phases detected at 5 °C.
Influence of Portland-limestone cement composition on sulfate attack performance
This research evaluates the sulfate attack performance of Portland-limestone cements (PLCs) with varying limestone compositions. Specimens prepared by replacing Type I/II and Type V cement with up to 20% limestone powders and fly ash are examined for their sulfate resistance in sodium and magnesium sulfate solutions at 5 °C and 23 °C by expansion measurements, an accelerated strength test, visual observations, and X-ray diffraction. For the materials tested, higher calcitic limestone contents increased expansion up to 290% with 20% limestone when added to Type I/II cement but decreased expansion up to 48% with 14.6% limestone (calcitic + dolomitic) when added to Type V cement. Strength loss was not proportional to the percentage of limestone added to the cements. Dolomitic limestone improved sulfate resistance as indicated by increased strength development in magnesium sulfate and reduced expansion in both solutions. Ettringite, thaumasite, gypsum, and brucite were the main sulfate attack phases detected at 5 °C.
Influence of Portland-limestone cement composition on sulfate attack performance
Elahi, Manjur (Autor:in) / Shearer, Christopher R. (Autor:in)
Journal of Sustainable Cement-Based Materials ; 14 ; 311-326
01.02.2025
16 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
| British Library Online Contents | 2013
Long term behavior of Portland limestone cement mortars exposed to magnesium sulfate attack
| Online Contents | 2009