BASIC PROPERTIES OF CARBONATION-TREATED CAO-BASED EXPANSIVE MATERIAL

The expansive material treated with surface carbonation of quicklime was mixed into mortar, and the length change and compressive strength were measured, and the hydration rate of the expansive material was evaluated. When the CaCO3 content was kept constant and the fineness was changed, the expansi...

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Bibliographic Details
Published inCement Science and Concrete Technology Vol. 78; no. 1; pp. 530 - 536
Main Authors JIA, Siyuan, YASUDA, Ryosuke, TABARA, Kazuto, HIGUCHI, Takayuki
Format Journal Article
LanguageEnglish
Japanese
Published Japan Cement Association 31.03.2025
Subjects
Carbonation
Compressive strength
Expansion material
Hydration Rate
Length change
Quicklime
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Summary:The expansive material treated with surface carbonation of quicklime was mixed into mortar, and the length change and compressive strength were measured, and the hydration rate of the expansive material was evaluated. When the CaCO3 content was kept constant and the fineness was changed, the expansion rate of the mortar decreased at 1 day and in/subcreased at 7 days as the fineness decreased. When the fineness of the raw quicklime was kept constant and the CaCO3 content was changed, the expansion rate at 1 day tended to decrease with the increase in the CaCO3 content. On the other hand, the expansion rate increased thereafter. It was considered that these phenomena were due to the formation of CaCO3 on the surface layer of the raw quicklime by the carbonation treatment, which delayed the hydration reaction.
ISSN:0916-3182
2187-3313
DOI:10.14250/cement.78.530