Efficiencies of carbonation and nano silica treatment methods in enhancing the performance of recycled aggregate concrete

Long Li; Dongxing Xuan; A. O. Sojobi; Songhui Liu; Chi Sun Poon

doi:10.1016/j.conbuildmat.2021.125080

Efficiencies of carbonation and nano silica treatment methods in enhancing the performance of recycled aggregate concrete

Long Li, Dongxing Xuan, A. O. Sojobi, Songhui Liu, Chi Sun Poon

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

59 Citations (Scopus)

Abstract

This study compared the efficiencies of five recycled aggregate treatment methods (pressurized gas–solid carbonation (PC), flow-through gas–solid carbonation (FC), wet carbonation (WC), nano-silica (NS) spraying and combined PC with NS spraying (PCNS)) in enhancing the performance of recycled aggregate concrete (RAC). Mechanical properties, durability and microhardness of RACs were evaluated. The results showed that PC method recorded higher enhancing efficiency than both FC and WC method. NS spraying method caused higher improvement in mechanical properties of RAC than three carbonation methods. Because of the synergistic effect of enhanced old mortar and new ITZ, PCNS method recorded the highest efficiency.

Original language	English
Article number	125080
Journal	Construction and Building Materials
Volume	308
DOIs	https://doi.org/10.1016/j.conbuildmat.2021.125080
Publication status	Published - 15 Nov 2021

Keywords

Carbonation
Durability
Mechanical property
Microhardness
Nano silica
Recycled coarse aggregate

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction
General Materials Science

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10.1016/j.conbuildmat.2021.125080

Cite this

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title = "Efficiencies of carbonation and nano silica treatment methods in enhancing the performance of recycled aggregate concrete",

abstract = "This study compared the efficiencies of five recycled aggregate treatment methods (pressurized gas–solid carbonation (PC), flow-through gas–solid carbonation (FC), wet carbonation (WC), nano-silica (NS) spraying and combined PC with NS spraying (PCNS)) in enhancing the performance of recycled aggregate concrete (RAC). Mechanical properties, durability and microhardness of RACs were evaluated. The results showed that PC method recorded higher enhancing efficiency than both FC and WC method. NS spraying method caused higher improvement in mechanical properties of RAC than three carbonation methods. Because of the synergistic effect of enhanced old mortar and new ITZ, PCNS method recorded the highest efficiency.",

keywords = "Carbonation, Durability, Mechanical property, Microhardness, Nano silica, Recycled coarse aggregate",

author = "Long Li and Dongxing Xuan and Sojobi, {A. O.} and Songhui Liu and Poon, {Chi Sun}",

note = "Funding Information: The authors are thankful to financial support by Construction Industry Council (CICR/03/19) and Research Grants Council GRF (PolyU 152144/17E). Publisher Copyright: {\textcopyright} 2021 Elsevier Ltd",

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AU - Li, Long

AU - Xuan, Dongxing

AU - Sojobi, A. O.

AU - Liu, Songhui

AU - Poon, Chi Sun

N1 - Funding Information: The authors are thankful to financial support by Construction Industry Council (CICR/03/19) and Research Grants Council GRF (PolyU 152144/17E). Publisher Copyright: © 2021 Elsevier Ltd

PY - 2021/11/15

Y1 - 2021/11/15

N2 - This study compared the efficiencies of five recycled aggregate treatment methods (pressurized gas–solid carbonation (PC), flow-through gas–solid carbonation (FC), wet carbonation (WC), nano-silica (NS) spraying and combined PC with NS spraying (PCNS)) in enhancing the performance of recycled aggregate concrete (RAC). Mechanical properties, durability and microhardness of RACs were evaluated. The results showed that PC method recorded higher enhancing efficiency than both FC and WC method. NS spraying method caused higher improvement in mechanical properties of RAC than three carbonation methods. Because of the synergistic effect of enhanced old mortar and new ITZ, PCNS method recorded the highest efficiency.

AB - This study compared the efficiencies of five recycled aggregate treatment methods (pressurized gas–solid carbonation (PC), flow-through gas–solid carbonation (FC), wet carbonation (WC), nano-silica (NS) spraying and combined PC with NS spraying (PCNS)) in enhancing the performance of recycled aggregate concrete (RAC). Mechanical properties, durability and microhardness of RACs were evaluated. The results showed that PC method recorded higher enhancing efficiency than both FC and WC method. NS spraying method caused higher improvement in mechanical properties of RAC than three carbonation methods. Because of the synergistic effect of enhanced old mortar and new ITZ, PCNS method recorded the highest efficiency.

KW - Carbonation

KW - Durability

KW - Mechanical property

KW - Microhardness

KW - Nano silica

KW - Recycled coarse aggregate

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JO - Construction and Building Materials

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Efficiencies of carbonation and nano silica treatment methods in enhancing the performance of recycled aggregate concrete

Abstract

Keywords

ASJC Scopus subject areas

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