New Optical Sensors for Determination of Corrosion in Reinforcement Concrete
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Описание:
Corrosion of reinforcement steel of concrete is one of the main causes of deteriorations of structures. Principally, it is an electrochemical process, which can be divided by two mechanisms– acidic and chloride initiated corrosion. Optical sensoric materials were prepared, which allow a non-destructive monitoring of these processes. The sensors are embedded into concrete structures and the signal is transported through optical fibres. pH–indicator azo dyes have been synthesised for monitoring of acidic attack. An aldehyde group has been used as dye–reactive functionality for the first time. The dyes have been covalent bound to poly(vinyl alcohol co ethylen) by acetal spacer bridge to assure long–term stability of the sensor. The colour change of such prepared pH–indicator materials occurs in the pH interval of 11 to 13 and allows to predictthe acidic attack in an early stage. The response time of these sensors is in the range of seconds. The optical detection of chloride ions in...Похожие книги
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