一、前言沿海钢筋混凝土建筑物,经常受到海水干湿交替的作用,因而钢筋往往会发生腐蚀,尤其在平均高潮位附近锈蚀最甚。调查我国南方沿海25座码头,发现有74％发生了不同程度的钢筋腐蚀。海工混凝土中钢筋腐蚀常用的研究方法是盐水浸烘循环试验。它是把埋有钢筋的混凝土试块放在人工模拟海水干湿交替的加速腐蚀环境中(浸泡盐水和烘干交替循环),测量钢筋腐蚀后的重量损失、腐蚀面积等,并用这些指标来表征混凝土中钢筋的耐蚀性能。国外浸烘试验采用的浸泡溶液一般为3～3.5％的氯化钠溶液,烘烤温度为50°～ I. Preface Coastal reinforced concrete structures are often subject to alternation of wet and dry seawater, so corrosion of steel tend to occur, especially in the vicinity of the average climax. Investigation of 25 docks along the southern coast of China found 74% of the steel bars had different degrees of corrosion. The common research method of steel corrosion in marine concrete is brine immersion drying test. It is to put reinforced concrete blocks embedded in artificial simulated seawater alternating wet and dry accelerated corrosion environment (immersion brine and drying cycle), measuring the weight loss after corrosion, corrosion area, etc., and use these indicators to characterize Corrosion resistance of reinforced concrete. Immersion solution used in foreign immersion test is generally 3 to 3.5% sodium chloride solution, the baking temperature is 50 ° ~