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Performance Enhancement of Recycled Concrete Aggregates through Carbonation

Zhang, Jiake / Shi, Caijun / Li, Yake / Pan, Xiaoying / Poon, Chi-Sun / Xie, Zhaobin

The cement paste attached to natural aggregates has a significant effect on the quality of recycled concrete aggregates (RCAs) because it usually has higher porosity and lower strength than natural aggregates. This work attempted to improve the quality of RCAs through carbonation of the attached cement paste. During carbonation reactions, ${CO}_{2}$ reacted with $Ca {(OH)}_{2}$ and calcium silicate hydrate ( $C ─ S ─ H$ ) to form ${CaCO}_{3}$ and silica gel, which filled the pores in the attached cement paste. Thus, carbonation increased the density, and decreased the water absorption and crushing values of the RCAs. It, thus, increased the flowability and compressive strength and decreased drying shrinkage of the recycled aggregate mortars.

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Performance Enhancement of Recycled Concrete Aggregates through Carbonation

Zhang, Jiake / Shi, Caijun / Li, Yake / Pan, Xiaoying / Poon, Chi-Sun / Xie, Zhaobin

The cement paste attached to natural aggregates has a significant effect on the quality of recycled concrete aggregates (RCAs) because it usually has higher porosity and lower strength than natural aggregates. This work attempted to improve the quality of RCAs through carbonation of the attached cement paste. During carbonation reactions, ${CO}_{2}$ reacted with $Ca {(OH)}_{2}$ and calcium silicate hydrate ( $C ─ S ─ H$ ) to form ${CaCO}_{3}$ and silica gel, which filled the pores in the attached cement paste. Thus, carbonation increased the density, and decreased the water absorption and crushing values of the RCAs. It, thus, increased the flowability and compressive strength and decreased drying shrinkage of the recycled aggregate mortars.

Performance Enhancement of Recycled Concrete Aggregates through Carbonation

Zhang, Jiake / Shi, Caijun / Li, Yake / Pan, Xiaoying / Poon, Chi-Sun / Xie, Zhaobin

The cement paste attached to natural aggregates has a significant effect on the quality of recycled concrete aggregates (RCAs) because it usually has higher porosity and lower strength than natural aggregates. This work attempted to improve the quality of RCAs through carbonation of the attached cement paste. During carbonation reactions, ${CO}_{2}$ reacted with $Ca {(OH)}_{2}$ and calcium silicate hydrate ( $C ─ S ─ H$ ) to form ${CaCO}_{3}$ and silica gel, which filled the pores in the attached cement paste. Thus, carbonation increased the density, and decreased the water absorption and crushing values of the RCAs. It, thus, increased the flowability and compressive strength and decreased drying shrinkage of the recycled aggregate mortars.

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Titel:

Performance Enhancement of Recycled Concrete Aggregates through Carbonation

Beteiligte:

Zhang, Jiake (Autor:in) / Shi, Caijun (Autor:in) / Li, Yake (Autor:in) / Pan, Xiaoying (Autor:in) / Poon, Chi-Sun (Autor:in) / Xie, Zhaobin (Autor:in)

Erschienen in:

Journal of Materials in Civil Engineering ; 27

Erscheinungsdatum:

18.03.2015

ISSN:

0899-1561 , 1943-5533

DOI:

https://doi.org/10.1061/(ASCE)MT.1943-5533.0001296

Medientyp:

Aufsatz (Zeitschrift)

Format:

Elektronische Ressource

Sprache:

Unbekannt

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