Indicator of carbonation front in concrete as substitute to phenolphthalein

被引：57

作者：

Chinchon-Paya, Servando ^{[1
]}

Andrade, Carmen ^{[2
]}

Chinchon, Servando ^{[3
]}

机构：

[1] CH3 Analyt, Carretera San Vicente S-N,Ac 99, E-03080 Alicante, Spain

[2] Inst Ciencias Construcc Eduardo Torroja, C Serrano Galvache 4, Madrid 28033, Spain

[3] Univ Alicante, Inst Agua & Ciencias Ambientales, Carretera San Vicente del Raspeig S-N, Alicante 03690, Spain

来源：

CEMENT AND CONCRETE RESEARCH | 2016年 / 82卷

关键词：

Carbonation; Concrete; Mortar; MECHANISM; MOISTURE; KINETICS;

D O I：

10.1016/j.cemconres.2015.12.010

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

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 similar to 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. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：87 / 91

页数：5

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