DESIGN AND DEVELOPMENT OF ADDITIVE FOR CO ₂ FIXATION UTILIZING BY-PRODUCT CONTAINING Ca （4） ─EFFECT OF ADDITIVE FOR CO ₂ FIXATION USING RAW CONCRETE SLUDGE ON INITIAL HYDRATION REACTIVITY OF CEMENT─

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The aim is to design a CO2 fixation additive utilizing raw concrete sludge and assess its impact on cement hydration.
Evaluated a CO2 fixation additive with a main component of γ-C2S using raw concrete sludge.
Considered compositions that generate C4AF and C2AS for optimal performance.
Examined the additive's effects on the initial hydration reaction of cement.
The CO2 fixation additive inhibits reactions of cement's early-age alite.
Adjusting gypsum content allows some aluminum ions to form ettringite, reducing reaction inhibition.
Mortar tests show good strength development before and after carbonation using the adjusted additive.

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This research evaluates an additive for CO2 fixation in cement, indicating its effects on early hydration reactivity.

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OHTA et al. (2026) studied this question.

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