桥梁高性能混凝土CT切片微观结构分析

Analysis of high performance concrete micro-structure in bridge based on CT slices

基于山西地方原材料,依托高平至沁水高速公路工程项目,对常温下C55高性能混凝土试件在标准养护条件7、28 d两个不同龄期下进行了X射线CT扫描试验,从定性和定量两个角度分析了其内部微观结构变化与龄期的关系,并得出了混凝土内部微结构随龄期的变化曲线,对高性能混凝土的抗压强度等宏观力学性能及耐久性能的研究提供了依据,同时也对山西地区公路桥梁上部结构常用预应力高性能混凝土施工控制具有重要的参考价值。

The behavior of C55 high performance concrete（ HPC） based on Shanxi local raw materials, relied on the superstructure of bridge in highway project from Gaoping to Qinshui,was carried out by CT scan test.Through the testing at room temperature, standard cured for 7d and 28 d,f rom two angles of qualitative and quantitative analysis, the relationship between the variation of micro-structure and the age was achieved.Meanwhile, the relevant regression model and the mathematics model for the internal micro-structure variation of HPC with the age was also established,providing the basis for the macro mechanical compressive strength and durability of HPC for the pre-stressed HPC commonly used in the superstructure of highway bridges in Shanxi region,also having an important reference value for the superstructure of highway bridges of commonly used pre-stressed HPC construction control.