超声波检测混凝土结构抗冻性的方法研究

STUDY ON ULTRASONIC TESTING OF FROST RESISTANCE OF CONCRETE STRUCTURES

依据固体结构动弹模与表面波速度的关系 ,采用超声波法检测混凝土冻融试件的动弹模 ,并与共振法测出的动弹模进行对比 ,总结出其内在相关规律 ,建立起预报混凝土动弹模的回归方程 ,由测得的波速计算出相应的动弹模 ,再利用动弹模之比评估出混凝土结构的抗冻性。初步试验和研究表明 ,此方法研究思路切实可行 ,符合混凝土冻融特性的基本变化规律 ,能够实现从试件测试向结构检测的发展 ,可供混凝土耐久性检测工程参考。

On the basis of the relation between the dynamic modulus of elasticity and the velocity of surface waves in solid structure, the dynamic modulus of elasticity in concrete freeze thaw specimen was tested by ultrasonic wave method. The modulus was compared with the one tested by traditional resonance method to get the inherent laws. The regression equations were set up for dynamic modulus forecast of concrete elasticity, and the relevant dynamic modulus of elasticity was calculated by the velocity measured, then the frost resistance of a concrete structure was evaluated by the ratio of dynamic modulus of elasticity. Preliminary test showed that the method was feasible and up to the basic law of concrete freeze thaw characteristics. It could realize the development from specimen testing to structure inspection, and supply reference for concrete durability test.