Application of Ultrasonic Waves in the Study of Compressive Strength of Freshly Mixed Liquid Fly Ash
Unconfined compressive strength testing is conducted on a new type of liquid fly ash material mixed with lime.The influence of lime content changes on the compressive strength of specimens is studied through tests.The results show that when the lime content is 0,4％,8％,and 12％,the compressive strength of freshly mixed liquid fly ash gradually increased at 7 days and 28 days,especially the strength at 28 days is significantly greater than that of 7 days.The ultrasonic wave velocity of the specimen is meas-ured by ultrasonic non-destructive testing technology,and the correlation between compressive strength and ultrasonic wave velocity is studied by regression analysis.The theoretical relationship between the two at different ages is established:for the 7 days age,a quadratic function should be used for fitting,and the re-gression equation is fcu=0.000000976692v2-0.000830792v+0.45616.At 28 days age,a linear function should be used for fitting,and the regression equation is fcu=0.002v-0.96639.The overall measured data relationship should be fitted with a quadratic function,and the regression equation is fcu=0.00000117211v2-0.000767908v+0.32397.The correlation R2 of 7 days and 28 days is both greater than 85％,indicating that a significant correlation between compressive strength and ultrasonic velocity. The research provides a theoretical basis for the non-destructive testing of fresh liquid fly ash.
万方数据
维普
