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首页> 外文会议>Final Conference of RILEM TC 253-MCI: Microorganisms-Cementitious Materials Interactions >OPTICAL PH IMAGING OF CONCRETE EXPOSED TO CHEMICALLY CORROSIVE ENVIRONMENTS
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OPTICAL PH IMAGING OF CONCRETE EXPOSED TO CHEMICALLY CORROSIVE ENVIRONMENTS

机译：混凝土的光学pH成像暴露于化学腐蚀环境

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摘要

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.
机译：具有碳酸化，浸出和酸侵蚀等化学混凝土降解的主要类型与降低内部或外部pH有关。因此，后者的精确确定对于评估关于腐蚀程度和预防策略的发展的评估至关重要。常规的pH测量方法用于混凝土，如酚酞指示，孔溶液提取和平坦表面电极已被证明含有显着的限制和不足。该贡献介绍了基于在聚合物水凝胶基质中捕获的发光pH敏感染料的传感器箔的应用，以量化和图像混凝土建筑材料表面pH的分布。使用称为时域双寿命参考（T-DLR）的成像技术，其抑制了从背景和其他光不均匀的散射的伪影。记录了使用这种方法，记录了暴露于碳酸化和生物酸腐蚀的混凝土样品的高分辨率pH分析物。

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