A comparison of liquid-solid and gas-solid accelerated carbonation for enhancement of recycled concrete aggregate

Songhui Liu; Peiliang Shen; Dongxing Xuan; Long Li; Adebayo Sojobi; Baojian Zhan; Chi Sun Poon

doi:10.1016/j.cemconcomp.2021.103988

A comparison of liquid-solid and gas-solid accelerated carbonation for enhancement of recycled concrete aggregate

Songhui Liu
, Peiliang Shen^*
, Dongxing Xuan
, Long Li
, Adebayo Sojobi
, Baojian Zhan
, Chi Sun Poon^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

236 Citations (Scopus)

Abstract

To enhance the properties of recycled concrete aggregates (RCA), a liquid-solid carbonation process was developed and compared with the conventional gas-solid pressurized carbonation method. The performance of RCA and the recycled aggregate concrete (RAC) prepared with the carbonated RCA by the two aforementioned carbonation methods was evaluated. The carbonation products assemblage, microstructure and porosity evolution were first characterized. The results indicated that after subjecting to a 10-min liquid-solid carbonation
process, a reduction of 12.2% in RCA water absorption and an increase of 2.6% in density were achieved, which were more efficient when compared to the 24-h gas-solid pressurized carbonation. More importantly, the compressive strength of RAC prepared with the 6-h liquid-solid carbonated RCA was significantly improved. In light of microstructural analysis, the enhanced performance of RAC was attributed to more additional mono-carbonate (Mc) and C–S–H gel formed at the interface between the liquid-solid carbonated RCA and the new cement pastes. © 2021 Elsevier Ltd

Original language	English
Article number	103988
Number of pages	14
Journal	Cement and Concrete Composites
Volume	118
Online published	22 Feb 2021
DOIs	https://doi.org/10.1016/j.cemconcomp.2021.103988
Publication status	Published - Apr 2021
Externally published	Yes

Funding

This work was supported by the Research Grants Council GRF (PolyU 152144/17E), and The Hong Kong Polytechnic University.

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 9 Industry, Innovation, and Infrastructure
SDG 11 Sustainable Cities and Communities

Research Keywords

Liquid-solid carbonation
Gas-solid pressurized carbonation
Recycled concrete aggregate
recycled aggregate concrete
Interface

RGC Funding Information

RGC-funded

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10.1016/j.cemconcomp.2021.103988

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title = "A comparison of liquid-solid and gas-solid accelerated carbonation for enhancement of recycled concrete aggregate",

abstract = "To enhance the properties of recycled concrete aggregates (RCA), a liquid-solid carbonation process was developed and compared with the conventional gas-solid pressurized carbonation method. The performance of RCA and the recycled aggregate concrete (RAC) prepared with the carbonated RCA by the two aforementioned carbonation methods was evaluated. The carbonation products assemblage, microstructure and porosity evolution were first characterized. The results indicated that after subjecting to a 10-min liquid-solid carbonation process, a reduction of 12.2\% in RCA water absorption and an increase of 2.6\% in density were achieved, which were more efficient when compared to the 24-h gas-solid pressurized carbonation. More importantly, the compressive strength of RAC prepared with the 6-h liquid-solid carbonated RCA was significantly improved. In light of microstructural analysis, the enhanced performance of RAC was attributed to more additional mono-carbonate (Mc) and C–S–H gel formed at the interface between the liquid-solid carbonated RCA and the new cement pastes. {\textcopyright} 2021 Elsevier Ltd",

keywords = "Liquid-solid carbonation, Gas-solid pressurized carbonation, Recycled concrete aggregate, recycled aggregate concrete, Interface",

author = "Songhui Liu and Peiliang Shen and Dongxing Xuan and Long Li and Adebayo Sojobi and Baojian Zhan and Poon, \{Chi Sun\}",

year = "2021",

month = apr,

doi = "10.1016/j.cemconcomp.2021.103988",

language = "English",

volume = "118",

journal = "Cement and Concrete Composites",

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T1 - A comparison of liquid-solid and gas-solid accelerated carbonation for enhancement of recycled concrete aggregate

AU - Liu, Songhui

AU - Shen, Peiliang

AU - Xuan, Dongxing

AU - Li, Long

AU - Sojobi, Adebayo

AU - Zhan, Baojian

AU - Poon, Chi Sun

PY - 2021/4

Y1 - 2021/4

N2 - To enhance the properties of recycled concrete aggregates (RCA), a liquid-solid carbonation process was developed and compared with the conventional gas-solid pressurized carbonation method. The performance of RCA and the recycled aggregate concrete (RAC) prepared with the carbonated RCA by the two aforementioned carbonation methods was evaluated. The carbonation products assemblage, microstructure and porosity evolution were first characterized. The results indicated that after subjecting to a 10-min liquid-solid carbonation process, a reduction of 12.2% in RCA water absorption and an increase of 2.6% in density were achieved, which were more efficient when compared to the 24-h gas-solid pressurized carbonation. More importantly, the compressive strength of RAC prepared with the 6-h liquid-solid carbonated RCA was significantly improved. In light of microstructural analysis, the enhanced performance of RAC was attributed to more additional mono-carbonate (Mc) and C–S–H gel formed at the interface between the liquid-solid carbonated RCA and the new cement pastes. © 2021 Elsevier Ltd

AB - To enhance the properties of recycled concrete aggregates (RCA), a liquid-solid carbonation process was developed and compared with the conventional gas-solid pressurized carbonation method. The performance of RCA and the recycled aggregate concrete (RAC) prepared with the carbonated RCA by the two aforementioned carbonation methods was evaluated. The carbonation products assemblage, microstructure and porosity evolution were first characterized. The results indicated that after subjecting to a 10-min liquid-solid carbonation process, a reduction of 12.2% in RCA water absorption and an increase of 2.6% in density were achieved, which were more efficient when compared to the 24-h gas-solid pressurized carbonation. More importantly, the compressive strength of RAC prepared with the 6-h liquid-solid carbonated RCA was significantly improved. In light of microstructural analysis, the enhanced performance of RAC was attributed to more additional mono-carbonate (Mc) and C–S–H gel formed at the interface between the liquid-solid carbonated RCA and the new cement pastes. © 2021 Elsevier Ltd

KW - Liquid-solid carbonation

KW - Gas-solid pressurized carbonation

KW - Recycled concrete aggregate

KW - recycled aggregate concrete

KW - Interface

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DO - 10.1016/j.cemconcomp.2021.103988

M3 - RGC 21 - Publication in refereed journal

SN - 0958-9465

VL - 118

JO - Cement and Concrete Composites

JF - Cement and Concrete Composites

M1 - 103988

ER -

A comparison of liquid-solid and gas-solid accelerated carbonation for enhancement of recycled concrete aggregate

Abstract

Funding

UN SDGs

Research Keywords

RGC Funding Information

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