滨海填土中预应力混凝土管桩钢筋腐蚀性研究

Corrosion of Steel Bars in Prestressed Concrete Pipe Piles in Coastal Filling Soil

随着滨海地区出现的大量围垦建设用地的开发,预应力管桩的使用在不断增加,作为长期处于含大量氯离子淤泥的建筑物的地下结构,其被腐蚀的程度直接影响建筑物的寿命。氯离子透过混凝土保护层引起钢筋的锈蚀,造成钢筋有效截面减小,同时使混凝土胀裂,最终导致管桩丧失结构性能。通过实验室加速腐蚀试验,测定并比较防腐与未防腐处理管桩,不同时期的钢筋电位及其变化规律。实验表明防腐涂层桩在初期,表现出良好的防腐蚀优势,后期两种类型的管桩腐蚀速率接近。

With the presence of large amount of land reclamation construction in the coastal area, the use ofprestressed pipe piles is constantly increasing. As an underground structure of buildings with large amount ofchloride ion silt, the degree of corrosion directly affects the life of the building. The chloride ion causes the corrosion of the steel reinforcement through the protective layer of concrete, resulting in the decrease of the effective section of the steel bar and the cracking of the concrete, resulting in the loss of structure of the pipe pile.The corrosion test of the steel bar was measured and compared with the test of the accelerated corrosion in the laboratory. The experimental results show that the anti-corrosion advantage of the anti-corrosive coating pile inthe early stage is good, and the corrosion rate of the two types of pipe pile is close to each other in the laterstage.