1力筋防护的重要性20世纪90年代以来,关于后张法预应力混凝土桥(下称PC桥)的耐久性,引起了工程界的广泛关注。起因是预应力混凝土的发详地———欧洲,因PC桥的劣化而引起的落桥及换梁的事例频频发生(表1),导致英国当局从1992年至1996年禁止使用需要压浆填充的后张法PC结构。表1 The importance of tendon protection Since the 1990s, the durability of post-tensioned prestressed concrete bridges (hereinafter referred to as PC bridges) has aroused widespread concern in engineering. This is due to the fact that prestressed concrete is a very specific issue. In Europe, the cases of falling bridges and changing beams caused by the deterioration of PC bridges occur frequently (Table 1), leading to the British authorities from banning the use of grouting Post-tensioned PC structure. Table 1