Abstract

Major types of chemical concrete degradation such as carbonation, leaching and acid attacks are strongly associated with decreasing internal or external pH. Thus a precise determination of the latter is crucial for the assessment regarding the degree of corrosion and corresponding development of prevention strategies. Conventional pH measure methods for concrete, such as phenolphthalein indicator, pore solution extractions and flat surface electrodes have proven to contain significant limitations and inadequacies. This contribution presents the application of sensor foils based on luminescent pH sensitive dyes entrapped in a polymeric hydrogel matrix, to quantify and image the distribution of surface pH of concrete based construction materials. An imaging technique called time-domain dual lifetime referencing (t-DLR) was used, which suppresses artifacts from scattering of the background and other light inhomogeneities. Using this methodology high-resolution pH profiles of concrete samples exposed to carbonation and biogenic acid corrosion were recorded.
Originalspracheenglisch
TitelProceedings of final Conference of RILEM TC 253-MCI
UntertitelMicroorganisms-Cementitious Materials Interactions
Herausgeber (Verlag)RILEM Publications S.a.r.l.
Seiten203-208
PublikationsstatusVeröffentlicht - Jun 2018

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Caustics
Concretes
Imaging techniques
Carbonation
Phenolphthalein
Corrosion
Acids
Hydrogel
Metal foil
Leaching
Coloring Agents
Scattering
Degradation
Electrodes
Sensors

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Müller, B., Grengg, C., Mittermayr, F., Mayr, T., Borisov, S., & Dietzel, M. (2018). OPTICAL PH IMAGING OF CONCRETE EXPOSED TO CHEMICALLY CORROSIVE ENVIRONMENTS. in Proceedings of final Conference of RILEM TC 253-MCI: Microorganisms-Cementitious Materials Interactions (S. 203-208). RILEM Publications S.a.r.l..

OPTICAL PH IMAGING OF CONCRETE EXPOSED TO CHEMICALLY CORROSIVE ENVIRONMENTS. / Müller, Bernhard; Grengg, Cyrill; Mittermayr, Florian; Mayr, Torsten; Borisov, Sergey; Dietzel, Martin.

Proceedings of final Conference of RILEM TC 253-MCI: Microorganisms-Cementitious Materials Interactions. RILEM Publications S.a.r.l., 2018. S. 203-208.

Publikation: Beitrag in Buch/Bericht/KonferenzbandBeitrag in einem KonferenzbandForschungBegutachtung

Müller, B, Grengg, C, Mittermayr, F, Mayr, T, Borisov, S & Dietzel, M 2018, OPTICAL PH IMAGING OF CONCRETE EXPOSED TO CHEMICALLY CORROSIVE ENVIRONMENTS. in Proceedings of final Conference of RILEM TC 253-MCI: Microorganisms-Cementitious Materials Interactions. RILEM Publications S.a.r.l., S. 203-208.
Müller B, Grengg C, Mittermayr F, Mayr T, Borisov S, Dietzel M. OPTICAL PH IMAGING OF CONCRETE EXPOSED TO CHEMICALLY CORROSIVE ENVIRONMENTS. in Proceedings of final Conference of RILEM TC 253-MCI: Microorganisms-Cementitious Materials Interactions. RILEM Publications S.a.r.l. 2018. S. 203-208
Müller, Bernhard ; Grengg, Cyrill ; Mittermayr, Florian ; Mayr, Torsten ; Borisov, Sergey ; Dietzel, Martin. / OPTICAL PH IMAGING OF CONCRETE EXPOSED TO CHEMICALLY CORROSIVE ENVIRONMENTS. Proceedings of final Conference of RILEM TC 253-MCI: Microorganisms-Cementitious Materials Interactions. RILEM Publications S.a.r.l., 2018. S. 203-208
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abstract = "Major types of chemical concrete degradation such as carbonation, leaching and acid attacks are strongly associated with decreasing internal or external pH. Thus a precise determination of the latter is crucial for the assessment regarding the degree of corrosion and corresponding development of prevention strategies. Conventional pH measure methods for concrete, such as phenolphthalein indicator, pore solution extractions and flat surface electrodes have proven to contain significant limitations and inadequacies. This contribution presents the application of sensor foils based on luminescent pH sensitive dyes entrapped in a polymeric hydrogel matrix, to quantify and image the distribution of surface pH of concrete based construction materials. An imaging technique called time-domain dual lifetime referencing (t-DLR) was used, which suppresses artifacts from scattering of the background and other light inhomogeneities. Using this methodology high-resolution pH profiles of concrete samples exposed to carbonation and biogenic acid corrosion were recorded.",
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AU - Borisov, Sergey

AU - Dietzel, Martin

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AB - Major types of chemical concrete degradation such as carbonation, leaching and acid attacks are strongly associated with decreasing internal or external pH. Thus a precise determination of the latter is crucial for the assessment regarding the degree of corrosion and corresponding development of prevention strategies. Conventional pH measure methods for concrete, such as phenolphthalein indicator, pore solution extractions and flat surface electrodes have proven to contain significant limitations and inadequacies. This contribution presents the application of sensor foils based on luminescent pH sensitive dyes entrapped in a polymeric hydrogel matrix, to quantify and image the distribution of surface pH of concrete based construction materials. An imaging technique called time-domain dual lifetime referencing (t-DLR) was used, which suppresses artifacts from scattering of the background and other light inhomogeneities. Using this methodology high-resolution pH profiles of concrete samples exposed to carbonation and biogenic acid corrosion were recorded.

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