The sprayed silver nitrate (AgNO₃) solution colorimetric method allows identifying chloride ion presence in concrete. However, this method gives false positive results in carbonated concrete structures. This work aims to help develop a technique that restrains carbonation interference in silver nitrate solution spraying for detecting chloride ions in reinforced concrete. Calcium hydroxide and sodium hydroxide solutions were applied to raise sample surface alkalinity and act as barrier to carbonated products. Tests were made in carbonated concrete samples and in carbonated concrete samples contaminated with chlorides. A method of spraying sodium hydroxide solution before spraying silver nitrate in concrete was used. Results show that this can eliminate carbonation interference in chloride ion penetration when measuring with the silver nitrate method. This permits the use of the silver nitrate solution colorimetric method in field inspections where structures are exposed to carbonation and chloride attack simultaneously.

喷洒的硝酸银（AgNO ₃溶液比色法可以识别混凝土中氯离子的存在。但是，这种方法在碳酸混凝土结构中给出了错误的肯定结果。这项工作旨在帮助开发一种技术，该技术可抑制硝酸银溶液喷涂中的碳化干扰，以检测钢筋混凝土中的氯离子。施加氢氧化钙和氢氧化钠溶液以提高样品表面的碱度，并作为对碳酸产品的屏障。在碳酸混凝土样品和被氯化物污染的碳酸混凝土样品中进行测试。使用在将硝酸银喷涂到混凝土中之前先喷涂氢氧化钠溶液的方法。结果表明，使用硝酸银法进行测量时，可以消除碳酸根对氯离子渗透的干扰。