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本文用超音波法及敲击回音法分别以斜向对打量测实体柱、不同厚度之块状试体、十字形试体及实体梁柱接头之压力波波速值,并与上述各试体之超音波直接对打量测的压力波波速值作比较,以评估斜向对打量测波速压力波之准确性,藉以探讨以斜向对打量测波速压力波值来检测梁柱接头混凝土质量之可行性.试验结果显示:超音波法于面宽40 cm之实体柱量测,当接收器偏距大于40 cm时,其波速值会明显下降;但敲击回音法以直径3 mm钢球作敲击源,接收器偏距超过70 cm波速值才会呈现下降趋势,以直径6mm钢球做量测则接收器偏距可达100cm,若以直径9mm钢球或铁锤做量测,接收器偏距达300 cm时,波速值仍未呈下降趋势.各试体之试验结果皆显示,超音波法之量测波速值基本上随接收器偏距增加而下降,但敲击回音法之波速值却不受偏距影响,其波速值与超音波直接对打值比较,误差皆在±3%以内.
In this paper, the ultrasonic wave velocity and the beat echo method were respectively used to measure the pressure wave velocity of the solid column, the block test body with different thickness, the cross-shaped test body and the solid beam-column joint, The ultrasound directly compares the measured pressure wave velocity to measure the accuracy of the diagonal measurement of the pressure wave to measure the feasibility of measuring the concrete quality of the beam-column joint by measuring the wave velocity diagonally The experimental results show that when the receiver offset is greater than 40 cm, the wave velocity decreases obviously when the ultrasonic method is applied to the solid column measuring 40 cm wide, but the percussive echo method uses the 3 mm diameter steel ball as the percussion Source and receiver offset more than 70 cm wave velocity value will show a downward trend to the diameter of 6mm ball measurement receiver offset up to 100cm, if the diameter of 9mm ball or hammer to do the measurement, the receiver partial When the distance is 300 cm, the wave velocity has not yet declined, and the experimental results show that the measured wave velocity of the ultrasonic method basically decreases with the increase of the receiver offset, but the wave velocity of the percussive echo method But not affected by the offset, the wave velocity value and ultrasonic directly on the value of comparison, Difference are within ± 3%.