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Characterization of entrained air voids in cement paste with scattered ultrasound

机译：散射超声表征水泥浆中夹带的气孔

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摘要

This research develops a technique that uses the attenuation of ultrasonic waves to characterize the average size and volume fraction of entrained air voids in hardened cement paste. Quantitative knowledge of entrained air void size and distribution helps ensure that an adequate design strength is developed, while maintaining resistance to freeze-thaw damage in cement-based materials. Ultrasonic attenuation coefficients obtained from pulse-burst signals are measured in the frequency range of 500 kHz-5 MHz. From these parameters, the average size and the volume fraction of the entrained air voids are determined using a combination of an ultrasonic scattering model and an inversion algorithm. Experiments are performed on specimens produced with and without entrained air voids. There is a good agreement between the model prediction and the experiments in these systems that contained <10 percent by volume of entrained air voids.
机译：这项研究开发了一种技术，该技术利用超声波的衰减来表征硬化水泥浆中夹带的气孔的平均尺寸和体积分数。关于夹带的气孔尺寸和分布的定量知识有助于确保开发出足够的设计强度，同时保持对水泥基材料的冻融破坏的抵抗力。从脉冲猝发信号获得的超声衰减系数在500 kHz-5 MHz的频率范围内测量。根据这些参数，结合使用超声散射模型和反演算法，确定夹带气孔的平均大小和体积分数。在带有和不带有夹带气孔的样品上进行实验。在这些系统中，模型预测与实验之间存在着很好的一致性，其中所包含的夹带空气体积小于10％。

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