高寒高海拔地区箱梁0+1号块混凝土冬季水化热实测分析  

Measurement and Analysis of Hydration Heat for Box Girder No.0 + No.1 Block Concrete in the High Altitude and Cold Weather Area

作　　者：赵海霞[1] ZHAO Haixia(Department of Civil Engineering, Nanhang Jincheng College, Nanjing, Jiangsu 211156, China)

机构地区：[1]南京航空航天大学金城学院土木工程系,江苏南京211156

出　　处：《施工技术》2018年第3期24-26,31,共4页Construction Technology

基　　金：大学生创新训练项目(2017009YZ)

摘　　要：青藏高原地区冬季高寒的气温可能会加剧箱梁0+1号块混凝土水化热内外温差。为了研究该地区冬季施工混凝土水化热的空间分布特点和时间发展规律,以青海省某大跨连续刚构桥为工程背景,现场实测了箱梁0+1号块混凝土浇筑后7d内的水化热温度场发展规律,然后在测试水泥生热率曲线的基础上,进行了水化热有限元仿真计算。温度场计算值与实测值吻合较好;在浇筑20h左右达到峰值,在160h左右衰减至接近外界气温;腹板和横隔板的中下部温度较高,需作为养护的重点关注部位;最后给出了养护建议。The winter cold air temperature in the Tibetan Plateau may intensify the hydration heat temperature difference in the box girder 0 ＋ 1 block. In order to study the spatial distribution characteristic and developing law with time of concrete hydration heat in winter,the hydration heat temperature of box girder 0 ＋ 1 block of a continuous rigid frame bridge in the Qinghai province was measured within 7 days after concrete pouring. Based on the cement heat-production-rate testing curve,simulation of hydration heat was conducted by using the finite element method. The calculated temperature values are in good agreement with the measured ones. The temperature reached a peak level at the 20 th hour,and declined to a value close to air temperature at the 160 th hour after concrete pouring. The temperature in middle-lower parts of the web plate and diaphragm plate,which should be paid more attention to in the maintenance. Some maintenance suggestions are available in this paper.

关 键 词：桥梁工程 箱梁 混凝土 水化热 数值模拟 

分 类 号：TU742[建筑科学—建筑技术科学]