Non-destructive Testing Technology On Strength Of Semi-rigid Base

With the rapid development of expressway construction in China, thetraditional coring detection method in semi-rigid base strength is hard to adapt tothe high standard and high efficiency of highway construction. Non-destructivetesting technology has been successfully applied in all kinds of strength and defectsdetection field. Beginning from the mechanism of non-destructive testingtechnology, on the basis of summing up the existing non-destructive testingtechnology and combining with semi-rigid base strength characteristics, this paperpresents the non-destructive testing technologies and testing methods that areapplied to semi-rigid base strength, and analyses influencing factors of semi-rigidbase non-destructive testing, then the paper comes up with correction principle ofthe test results based on the fuzzy analytic hierarchy process, from non-destructivetesting of core samples of semi-rigid base course of Changping expressway, newbase course site and core samples of Yingsong expressway, semi-rigid base coursesite and core samples of Baishan-Fusong maintenance section of G201nationalhighway, the main research results achieved are as follows:By comparing and selecting the existing non-destructive testing technologiesand methods, combining with the strength characteristics of semi-rigid base course,the paper presents testing method for base course strength by coupling control ofultrasonic velocity and base course density, establishes semi-rigid base strengthnon-destructive evaluation model.Linear relationship between wave velocity of plane monitor method and wavevelocity of relative measuring method was determined through comparative testregression analysis on the two methods.The combined detection method of ultrasonic wave and density instrument forbase course strength is not applicable to base course with loose surface, and basewith lower strength as well. It is recommended for use in strength detection ofsemi-rigid base roads above second class.According to field and indoor ultrasonic wave detection tests, this projectindicates that the relative standard error of field ultrasonic testing for semi-rigidbase strength is less than or equal to20%,and relative standard error of indoor ultrasonic testing for core samples is less than or equal to14%.