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Natural Carbonation Resistance of RCA-SCC Blended with Mineral Admixtures

Natural Carbonation Resistance of RCA-SCC Blended with Mineral Admixtures The work reported in this paper comprises of estimation of natural carbonation resistance of recycled concrete aggregates-based self-compacting concrete (RCA-SCC) tested for natural outdoor exposure until 6 years. Thirteen RCA-SCC mixes were made in total, covering control SCC, four RCA-SCC mixes, and eight RCA-SCC mixes blended with mineral admixtures. Natural carbonation tests were performed after specified exposure using the conventional phenolphthalein method. The findings indicate reduction of natural carbonation resistance with increase in RCA as replacement of coarse natural aggregates (CNA) along with prolonging time due to their distinct physio-structural compositions. The maleficence due to the presence of RCA in SCC has been recompensed up to a certain extent with the addition of silica fume (SF) or metakaolin (MK). The results also show a steady decrease in resistance towards natural carbonation when the alteration level increases resulting in higher values of carbonation coefficients obtained for non-blended and blended RCA-SCC mixes. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of The Institution of Engineers (India):Series A Springer Journals

Natural Carbonation Resistance of RCA-SCC Blended with Mineral Admixtures

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Publisher
Springer Journals
Copyright
Copyright © The Institution of Engineers (India) 2022
ISSN
2250-2149
eISSN
2250-2157
DOI
10.1007/s40030-022-00620-w
Publisher site
See Article on Publisher Site

Abstract

The work reported in this paper comprises of estimation of natural carbonation resistance of recycled concrete aggregates-based self-compacting concrete (RCA-SCC) tested for natural outdoor exposure until 6 years. Thirteen RCA-SCC mixes were made in total, covering control SCC, four RCA-SCC mixes, and eight RCA-SCC mixes blended with mineral admixtures. Natural carbonation tests were performed after specified exposure using the conventional phenolphthalein method. The findings indicate reduction of natural carbonation resistance with increase in RCA as replacement of coarse natural aggregates (CNA) along with prolonging time due to their distinct physio-structural compositions. The maleficence due to the presence of RCA in SCC has been recompensed up to a certain extent with the addition of silica fume (SF) or metakaolin (MK). The results also show a steady decrease in resistance towards natural carbonation when the alteration level increases resulting in higher values of carbonation coefficients obtained for non-blended and blended RCA-SCC mixes.

Journal

Journal of The Institution of Engineers (India):Series ASpringer Journals

Published: Mar 31, 2022

Keywords: Metakaolin; Natural carbonation; Recycled concrete aggregates; Self-compacting concrete; Silica fume

References