PHYSICAL PROPERTIES AND HYDRATION ANALYSIS OF MORTAR MIXED WITH EXPANSIVE ADDITIVES TREATED WITH CARBONATION AT HIGH TEMPERATURE

Ettringite quicklime complex expansive additive was treated with high-temperature CO2 gas and mixed with mortar. The physical properties of the mixture were then evaluated. The expansion deformation of mortar was reduced by the first day of the material age, but significant expansion occurred from t...

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Bibliographic Details
Published inCement Science and Concrete Technology Vol. 67; no. 1; pp. 129 - 136
Main Authors HIGUCHI, Takayuki, EGUCHI, Masataka, MORIOKA, Minoru, SAKAI, Etsuo
Format Journal Article
LanguageJapanese
Published Japan Cement Association 25.02.2014
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Summary:Ettringite quicklime complex expansive additive was treated with high-temperature CO2 gas and mixed with mortar. The physical properties of the mixture were then evaluated. The expansion deformation of mortar was reduced by the first day of the material age, but significant expansion occurred from the first day of the material age, and an increase by about 23% in comparison with that of untreated materials was observed by the seventh day of the material age. Hydration analysis indicated inhibition of hydration of the expansive material in about six hours after water was poured onto the mixture, and in particular, the reaction of the free lime was inhibited. The reaction rate of the free lime after six hours of material life age was comparable with that of the untreated materials. The calcite contents increased with the progression of high-temperature carbonation, and a calcite film of about 0.2μm thickness was formed on the surface of the free lime. An increase in the expansion deformation of mortar was suggested by the deceased amount of losses in the free lime, which reacts prior to the formation of the cement matrix.
ISSN:0916-3182
2187-3313
DOI:10.14250/cement.67.129