无损检测在超高性能混凝土冻害后的适用性分析

Applicability analysis of nondestructive testing after cyclic freeze-thaw damage and deterioration of ultrahigh performance concrete structures

为探究无损检测方法在超高性能混凝土结构循环冻融损伤劣化后的适用性,制备超高性能混凝土,设定两种混凝土损伤方法,采用超声脉冲速度、动态弹性模量和抗压强度测试方法,对混凝土结构进行分析。建立各种试验方法与超高性能混凝土性能劣化之间的关系,阐述每种方法在特定情况下的优缺点,得到一种观察超高性能混凝土在经历循环冻害劣化后的结构变化的新方法,有助于更好地研究超高性能混凝土冻害后的劣化机理。

In order to explore the applicability of nondestructive testing methods in the deterioration of ultrahigh performance concrete structures after cyclic freeze-thaw damage,ultrahigh performance concrete with different properties was prepared in this study.Ultrasonic pulse velocity,dynamic elastic modulus,compressive strength testing methods and fluorescent dyes were used to conduct experiments.This study establishes the relationship between various test methods and performance deterioration of ultra high perfbnnance concrete and illustrates the advantages and disadvantages of each method in specific cases.In this study,a new method was developed to observe the structural changes of ultrahigh performance concrete after cyclic freezing damage.The experimental results are helpfill for scientists to better understand the deterioration mechanism of ultra—high performance concrete after freezing damage.