Material & Technology 材料与技术 透过界面继续传播,一部分进行反 plugins on the ultrasonic time and amplitude of self-compact- 射和折射 [7-8]。 当超声波通过不同物质 状 态 的 介 质 时 ,会 表 现 出 不 同 的 声 学 现 ing concrete. The research results showed that the ultrasonic 象。 通过传播速度、传播时间、首播波幅、频率等声学参数,可以判断介质的物 sound velocity increases and the amplitude decreases as the 质状态。 moisture content rises; and the ultrasonic sound velocity value increases along with the enhancement of the concrete strength from C30 to C60, and with the moisture content of 0 the 1 原材料与试验方法 sound velocity increases by km/s; when the water content is % , the sound velocity increases by ; when the 试验目的 thickness of the steel plate is increased from 10mm to 40mm, 探究含水率、混凝土强度等级、钢插件等因素对超声波检测自密实混凝土时 the ultrasonic sound velocity increase value soars from 的影响,通过对声速、波幅数据的分析,从而确定各项因素的影响程度,为超声波 to , and the ultrasonic wave amplitude 检测提供一定的理论参考依据。 decrease value rises from to 7dB; when the number of 测试仪器 steel plates increases from 1 to 4, the sound velocity increase 测试仪器具体型号如表 1 所示。 value rises from to , and the amplitude 表1 超声波检测器性能介绍 reduction value increases from to .