大跨PC箱梁桥早期收缩裂缝成因及控制措施探析  

Research on Mechanism and Control Measures of Early-age Shrinkage Cracking for Long-span Prestress Concrete Box Girder Bridge

作　　者：颜海江 

机构地区：[1]中铁十一局集团第一工程有限公司,襄阳441104

出　　处：《城市建筑》2014年第11期345-345,共1页Urbanism and Architecture

摘　　要：在大跨 PC箱梁桥出现早期，收缩裂缝的风险最高点在箱梁0＃块和合龙段位置。其中引起箱梁早期收缩裂缝的三大重要原因，包括高强高性能混凝土早期的大收缩性、混凝土节段间龄期的差异性和混凝土的水化热效应。The early shrinkage cracks are most likely to app-ear in the start segment and closure segment for long-span PC box Girder Bridge. Early shrinkage of High-strength and Hi-gh-performance Concrete, the differences of age between seg-ments and the concrete hydration heat effect are three imp-ortant cause of box girder early shrinkage cracking.

关 键 词：箱梁桥 早期收缩 裂缝控制 

分 类 号：U416.216[交通运输工程—道路与铁道工程]