混凝土结构抗冻性超声检测方法的研究

Study on the ultrasonic checking method for frost resistance in concrete structure

依据固体结构动弹模与表面波速度的本构关系,采用超声波技术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定出混凝土结构的抗冻性。通过初步试验和检测方法的研究表明,此研究方法思路切实可行,可供混凝土耐久性检测工程参考。

According to the basic relationship between dynamic elasticity modulus and velocity of surface wave in solid structure,the authors checked the modulus in concrete freezethaw specimen by using ultrasonic wave method and contrasted it with the modulus by using traditional resonance method.The regression equation for dynamic modulus for forecasting concrete elasticity was derived.The relevant dynamic modulus elasticity was calculated with the measured wave velocity.Then the frost resistance in concrete structure by the ratio of dynamic elasticity modulus was evaluated.A preliminary test on the results indicated that the method was feasible and can be applied in checking concrete durability.