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Study of Hydration and Microstructure of Mortar Containing Coral Sand Powder Blended with SCMs

The utilization of coral waste is an economical way of using concrete in coastal and offshore constructions. Coral waste with more than 96% CaCO(3) can be ground to fines and combined with supplementary cementitious materials (SCMs) such as fly ash, silica fume, granulated blast furnace slag in repl...

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Autores principales: Li, Xingxing, Ma, Ying, Shen, Xiaodong, Zhong, Ya, Li, Yuwei
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7578948/
https://www.ncbi.nlm.nih.gov/pubmed/32987635
http://dx.doi.org/10.3390/ma13194248
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author Li, Xingxing
Ma, Ying
Shen, Xiaodong
Zhong, Ya
Li, Yuwei
author_facet Li, Xingxing
Ma, Ying
Shen, Xiaodong
Zhong, Ya
Li, Yuwei
author_sort Li, Xingxing
collection PubMed
description The utilization of coral waste is an economical way of using concrete in coastal and offshore constructions. Coral waste with more than 96% CaCO(3) can be ground to fines and combined with supplementary cementitious materials (SCMs) such as fly ash, silica fume, granulated blast furnace slag in replacing Portland cement to promote the properties of cement concrete. The effects of coral sand powder (CSP) compared to limestone powder (LSP) blended with SCMs on hydration and microstructure of mortar were investigated. The result shows CSP has higher activity than LSP when participating in the chemical reaction. The chemical effect among CSP, SCMs, and ordinary Portland cement (OPC) results in the appearance of the third hydration peak, facilitating the production of carboaluminate. CSP-SCMs mortar has smaller interconnected pores on account of the porous character of CSP as well as the filler and chemical effect. The dilution effect of CSP leads to the reduction of compressive strength of OPC-CSP and OPC-CSP-SCMs mortars. The synergic effects of CSP with slag and silica fume facilitate the development of compressive strength and lead to a compacted isolation and transfer zone (ITZ) in mortar.
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spelling pubmed-75789482020-10-29 Study of Hydration and Microstructure of Mortar Containing Coral Sand Powder Blended with SCMs Li, Xingxing Ma, Ying Shen, Xiaodong Zhong, Ya Li, Yuwei Materials (Basel) Article The utilization of coral waste is an economical way of using concrete in coastal and offshore constructions. Coral waste with more than 96% CaCO(3) can be ground to fines and combined with supplementary cementitious materials (SCMs) such as fly ash, silica fume, granulated blast furnace slag in replacing Portland cement to promote the properties of cement concrete. The effects of coral sand powder (CSP) compared to limestone powder (LSP) blended with SCMs on hydration and microstructure of mortar were investigated. The result shows CSP has higher activity than LSP when participating in the chemical reaction. The chemical effect among CSP, SCMs, and ordinary Portland cement (OPC) results in the appearance of the third hydration peak, facilitating the production of carboaluminate. CSP-SCMs mortar has smaller interconnected pores on account of the porous character of CSP as well as the filler and chemical effect. The dilution effect of CSP leads to the reduction of compressive strength of OPC-CSP and OPC-CSP-SCMs mortars. The synergic effects of CSP with slag and silica fume facilitate the development of compressive strength and lead to a compacted isolation and transfer zone (ITZ) in mortar. MDPI 2020-09-24 /pmc/articles/PMC7578948/ /pubmed/32987635 http://dx.doi.org/10.3390/ma13194248 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Li, Xingxing
Ma, Ying
Shen, Xiaodong
Zhong, Ya
Li, Yuwei
Study of Hydration and Microstructure of Mortar Containing Coral Sand Powder Blended with SCMs
title Study of Hydration and Microstructure of Mortar Containing Coral Sand Powder Blended with SCMs
title_full Study of Hydration and Microstructure of Mortar Containing Coral Sand Powder Blended with SCMs
title_fullStr Study of Hydration and Microstructure of Mortar Containing Coral Sand Powder Blended with SCMs
title_full_unstemmed Study of Hydration and Microstructure of Mortar Containing Coral Sand Powder Blended with SCMs
title_short Study of Hydration and Microstructure of Mortar Containing Coral Sand Powder Blended with SCMs
title_sort study of hydration and microstructure of mortar containing coral sand powder blended with scms
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7578948/
https://www.ncbi.nlm.nih.gov/pubmed/32987635
http://dx.doi.org/10.3390/ma13194248
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