一、前言混凝土桥梁由于其所处的位置,而要经受水(雨或雪)、温度、化雪盐、工业废气等的侵蚀。在不设防水层或防水层有缺陷时,构成桥梁结构的钢筋、混凝土,逐渐受到腐蚀。以至导致结构承载能力的降低。据瑞典和西德的资料介绍,有25％—30％的桥梁存在不设防水层和防水层有缺陷所引起的问题。出自同样的原因,美国有4400座桥梁 I. INTRODUCTION Due to its location, concrete bridges are subject to erosion by water (rain or snow), temperature, snow and salt, industrial waste gas and so on. In the absence of waterproof layer or waterproof layer defects, the composition of the bridge structure of steel, concrete, gradually corrosion. As a result, the structural load-bearing capacity is reduced. According to data from Sweden and West Germany, 25% to 30% of the bridges have problems caused by imperfections in the waterproof layer and waterproof layer. For the same reason, the United States has 4,400 bridges