The monitoring of the carbonation process plays a key role in monitoring the health of reinforced concrete structures. In this study, the carbonation depth of concrete was measured using image processing and endoscopic methods, which relied on the pH level of the concrete containing crystalline waterproofing material. The results show that the carbonation depth and pH of the concrete were estimated by the nondestructive endoscopic method-based graphical user interface, with a high accuracy of 0.99. Furthermore, it was observed that crystalline waterproofing material increased the carbonation depth of concrete. Due to the lack of direct contact between the water molecules and the NaO, the crystalline structure could not form sufficiently to prevent CO penetration. This phenomenon caused porosity in the mortar, a decrease in the velocity of the ultrasonic sound, and thus a loss of strength. However, a slight increase in compressive strength after carbonation was attributed to the sodium bicarbonate filling in the voids as a result of the reactions between NaO, water molecules, and CO.

中文翻译：

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内窥镜法测定含结晶防水剂混凝土的碳化深度和pH值


碳化过程的监测对于监测钢筋混凝土结构的健康状况起着关键作用。在本研究中，利用图像处理和内窥镜方法测量混凝土的碳化深度，该深度依赖于含有结晶防水材料的混凝土的pH值。结果表明，基于无损内窥镜方法的图形用户界面估算了混凝土的碳化深度和pH值，准确度高达0.99。此外，据观察，结晶防水材料增加了混凝土的碳化深度。由于水分子和Na2O之间缺乏直接接触，晶体结构无法充分形成以防止CO渗透。这种现象导致砂浆出现孔隙，超声波速度降低，从而导致强度损失。然而，碳酸化后抗压强度略有增加，这是由于 Na2O、水分子和 CO 之间的反应导致碳酸氢钠填充到空隙中。