纤维/水泥改性泥浆超声波速特性研究

Study on Ultrasound Velocity Characteristics of Fiber/Cement Modified Slurry

摘要: 无侧限抗压强度是纤维/水泥改性泥浆的重要力学指标，而目前的检测技术都需要对试样进行破坏，因此针对纤维/水泥改性泥浆的抗压强度传统测试方法进行改进，提出采用超声波法对改性泥浆的抗压强度进行测试，对掺量的改变引起的改性泥浆波速的变化特性进行研究。试验结果表明：1) 在不掺纤维的情况下，波速随着水泥掺量的增加而增大；2) 水泥掺量不变的情况下，波速随着纤维掺量的增加而呈现下降的趋势，不同材料改性泥浆的超声波速与抗压强度之间具有良好的相关性；3) 水泥产量的改变对纤维/水泥改性泥浆的抗压强度影响最大，水泥掺量在由20%增加为25%时，强度增幅最大，抗压强度大小增加了44%。

Abstract: Unconstrained compressive strength is an important mechanical index of fiber/cement modified slurry, but the current testing technology needs to destroy the samples. In view of the improvement of the traditional test method of compressive strength of fiber/cement modified slurry, the ultrasonic method is proposed to test the compressive strength of modified slurry, and the variation characteristics of wave velocity of modified slurry caused by the change of dosage are studied.  The results show that: 1) Without fiber, the wave velocity increases with the increase of cement content; 2) When the cement content remains unchanged, the wave velocity decreases with the increase of fiber content, and there is a good correlation between ultrasonic velocity and compressive strength; 3) The change of cement output has the greatest impact on the compressive strength of fiber/cement modified slurry, and the cement content increases from 20% to 25%. At the same time, the increase of strength is the largest, and the compressive strength increases by 44%.