Indicator of carbonation front in concrete as substitute to phenolphthalein

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Title: Indicator of carbonation front in concrete as substitute to phenolphthalein
Authors: Chinchón Payá, Servando | Andrade, Carmen | Chinchón Yepes, Servando
Research Group/s: Advanced deveLopment and empIrical research on Software (ALISoft) | Materiales y Sistemas Constructivos de la Edificación
Center, Department or Service: Universidad de Alicante. Departamento de Construcciones Arquitectónicas | Universidad de Alicante. Instituto Universitario del Agua y las Ciencias Ambientales
Keywords: Carbonation | Concrete | Mortar
Knowledge Area: Construcciones Arquitectónicas
Issue Date: Apr-2016
Publisher: Elsevier
Citation: Cement and Concrete Research. 2016, 82: 87-91. doi:10.1016/j.cemconres.2015.12.010
Abstract: A method to substitute the recognized toxic phenolphthalein in mortars and concretes is proposed. It comprises putting a portland cement sample in contact with an innocuous solution, curcumin-based, which acts as an indicator yielding a red color in areas where there is alkaline reserve (pH ~ 12) and yellow in carbonate zones (pH ≤ 9). Solutions containing curcumin extracted from commercial turmeric powder and from the rhizomes of the turmeric plant were prepared by using ethanol as a solvent. Subsequently it has been experienced with solutions in which curcumin has been used with a purity of over 95%. The dissolution of curcumin can be used with the same reliability as phenolphthalein in the carbonation process with the advantage that it is safe and presents no health risks.
Sponsor: The research was conducted with the support and funding from CH3 Analytics.
ISSN: 0008-8846 (Print) | 1873-3948 (Online)
DOI: 10.1016/j.cemconres.2015.12.010
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2016 Elsevier Ltd.
Peer Review: si
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Appears in Collections:INV - ALISoft - Artículos de Revistas
INV - MSCE - Artículos de Revistas

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