Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
New fluorescent pH indicators for characterizing cement carbonation
Highlights Evaluation of the carbonation labeling effect of four fluorescent indicators. Fluorescent indicator accurately shows the carbonation front. Electrochemical characterization was used to determine the corrosion pH of the steel.
Abstract Fluorescent indicators of a wider labeling pH range of 7.0–12.5 were prepared to characterize the pH evolution of the accelerated/natural carbonation of cement and the corrosion of steel bar. Compared with conventional indicators (phenolphthalein, pH range of 8.2–8.5), these indicators indicate multiple pH-induced switches of different fluorescence emissions for the fluorescence resonance energy transfer between donor–acceptor. The results showed that the newly-developed indicators are sensitive and applicable for labeling both natural and accelerated carbonation of cement. Investigations by Fourier Transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and thermogravimetric analysis demonstrated the reliability of these indicators, that is, in the “uncarbonated area” shown by phenolphthalein, carbonization actually occurs as exhibited by fluorescent indicators. Furthermore, electrochemical impedance spectroscopy, as well as dynamic potential polarization studies showed that rusting/corrosion of reinforcing steel started when the pH dropped to 11.5 in the simulation study. This work promoted the contribution of fluorescent indicators in cement carbonation characterization, with a wide pH response.
New fluorescent pH indicators for characterizing cement carbonation
Highlights Evaluation of the carbonation labeling effect of four fluorescent indicators. Fluorescent indicator accurately shows the carbonation front. Electrochemical characterization was used to determine the corrosion pH of the steel.
Abstract Fluorescent indicators of a wider labeling pH range of 7.0–12.5 were prepared to characterize the pH evolution of the accelerated/natural carbonation of cement and the corrosion of steel bar. Compared with conventional indicators (phenolphthalein, pH range of 8.2–8.5), these indicators indicate multiple pH-induced switches of different fluorescence emissions for the fluorescence resonance energy transfer between donor–acceptor. The results showed that the newly-developed indicators are sensitive and applicable for labeling both natural and accelerated carbonation of cement. Investigations by Fourier Transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and thermogravimetric analysis demonstrated the reliability of these indicators, that is, in the “uncarbonated area” shown by phenolphthalein, carbonization actually occurs as exhibited by fluorescent indicators. Furthermore, electrochemical impedance spectroscopy, as well as dynamic potential polarization studies showed that rusting/corrosion of reinforcing steel started when the pH dropped to 11.5 in the simulation study. This work promoted the contribution of fluorescent indicators in cement carbonation characterization, with a wide pH response.
New fluorescent pH indicators for characterizing cement carbonation
Du, Ning (Autor:in) / Guan, Ruifang (Autor:in) / Hou, Pengkun (Autor:in)
02.05.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
A Review of Characterizing Methods for Carbonation in Cement-Based Materials
| Trans Tech Publications | 2022
| Europäisches Patentamt | 2024