混凝土波速受检测方法影响的研究

Studies on wave velocities in concrete measured with different test methods

为建立超声波法和低应变反射波法检测所得基桩等混凝土构件波速的相互转换方法,给出了Kelvin-Voigt粘弹性介质的三维和一维纵波速度之比及其实用简化公式。结果表明,混凝土构件的超声波速与1.054倍低应变动测波速之比处于1.03～1.12,具体数值会随着混凝土龄期、弹性模量和强度等级的增加而有所减小。

To establish a relationship between wave velocities in concrete pile shaft measured respectively by the ultrasonic wave method and low-strain reflected wave method, a simplified formula for the ratio of wave velocity in infinite medium to that in one dimensional bar was proposed herein by use of the Kelvin-Voigt viscoelastic theory. It was shown by theoretical and experimental studies that the ratio of ultrasonic wave velocity to 1.054 times of low-strain reflected wave velocity ranged among 1.03～1.12, which decreased with increasing of the age, Young＇s modulus and strength of concrete.