一、前言在钢筋混凝土建筑物中,钢筋因得到混凝土的保护而不与大气和雨水等接触,同时又处在强碱的介质中,在通常使用的条件下,虽经很长的岁月但腐蚀却很少。但是,近年来随着工业化的进展,环境污染日益严重,因而钢筋混凝土建筑物的耐久性一般都下降。同时,海岸、海洋建筑物日趋噌多,因此,防止钢筋腐蚀的措施就显得非常重要了。还有,由于技术革新,混凝土的材料和施工方法有很大的变化。另外,由于普及了泵送 I. INTRODUCTION In reinforced concrete buildings, reinforcing steel is not protected from contact with the atmosphere, rain, etc. by being protected by concrete, but is also in a medium of strong alkalis. Under the conditions of normal use, the steel is corroded for a long time. But very few. However, with the progress of industrialization in recent years, environmental pollution has become increasingly serious, and the durability of reinforced concrete buildings has generally declined. At the same time, coastal and marine buildings are increasingly rampant, so measures to prevent corrosion of steel bars are very important. Also, due to technological innovations, the materials and construction methods of concrete have changed greatly. In addition, due to the popularity of pumping