Performance enhancement of recycled concrete aggregates through carbonation

Jiake Zhang; Caijun Shi; Yake Li; Xiaoying Pan; Chi Sun Poon; Zhaobin Xie

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

Performance enhancement of recycled concrete aggregates through carbonation

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

Research output: Journal article publication › Journal article › Academic research › peer-review

331 Citations (Scopus)

Abstract

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, CO2reacted with Ca(OH)2and calcium silicate hydrate (C-S-H) to form CaCO3and 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.

Original language	English
Article number	04015029
Journal	Journal of Materials in Civil Engineering
Volume	27
Issue number	11
DOIs	https://doi.org/10.1061/(ASCE)MT.1943-5533.0001296
Publication status	Published - 1 Jan 2015

Keywords

Carbonation treatment
Mechanical properties
Physical properties
Recycled concrete aggregate

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction
General Materials Science
Mechanics of Materials

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10.1061/(ASCE)MT.1943-5533.0001296

Cite this

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abstract = "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, CO2reacted with Ca(OH)2and calcium silicate hydrate (C-S-H) to form CaCO3and 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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AU - Zhang, Jiake

AU - Shi, Caijun

AU - Li, Yake

AU - Pan, Xiaoying

AU - Poon, Chi Sun

AU - Xie, Zhaobin

PY - 2015/1/1

Y1 - 2015/1/1

N2 - 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, CO2reacted with Ca(OH)2and calcium silicate hydrate (C-S-H) to form CaCO3and 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.

AB - 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, CO2reacted with Ca(OH)2and calcium silicate hydrate (C-S-H) to form CaCO3and 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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KW - Mechanical properties

KW - Physical properties

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DO - 10.1061/(ASCE)MT.1943-5533.0001296

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Performance enhancement of recycled concrete aggregates through carbonation

Abstract

Keywords

ASJC Scopus subject areas

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