Insights into the acting mechanism of ettringite in expansive Portland cement

Marcelo Tramontin Souza,Lucas Onghero,Rafael Dors Sakata,Francisco Cavilha Neto,Carlos Eduardo Maduro de Campos,José Renato de Castro Pessôa,Wellington Longuini Repette,Antonio Pedro Novaes de Oliveira

Materials Letters（2023）

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Abstract

•The expansive admixture produced numerous colloidal ettringite crystals.•Higher ettringite contents at the onset of the acceleration period favor expansion.•The greater the amount of ettringite crystals, the lower the growth rate.

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Key words

Expansive cement,Expansive admixture,Ettringite,Expansion mechanism

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