实现混凝土桥的轻量化的途径 :一是取决于采用的材料 ;二是取决于结构构造。就材料而言 ,最有效的是采用轻型骨料。以往研制的轻型骨料 ,虽然其相对密度、压缩强度指标都较好 ,但因吸水率很大而影响了结构的耐久性。最近开发的一种轻型骨料 ,相对密度为 0 .8,2 4ｈ的吸水率小于 Way to achieve lightweight concrete bridge: First, depends on the material used; the second is dependent on the structural structure. In terms of materials, the most effective use of light aggregate. In the past, lightweight aggregates, although the relative density, compressive strength indicators are good, but because of the large water absorption and affect the durability of the structure. A recently developed lightweight aggregate with a relative density of 0.8 and a 24 h water absorption less than