by Click the blue word • pay attention to us Zhang Ming Hua 1993 – about the author: Zhang Minghua (1993 -), female, born in Baoding, Hebei Province, master, engineer, main research direction: self compacting concrete and its nondestructive testing technology.
Fund Project: Chongqing special key project of technological innovation and application development, research and application of key technologies for construction of high strength self compacting concrete of super high rise Mega composite structure (cstc2019jscx-gksbx0041).
Content introduction: This paper summarizes the test principle, test methods, test defect types and influencing factors of ultrasonic nondestructive testing of concrete component defects, so as to provide a certain reference for understanding the research progress of ultrasonic testing of concrete defects.
Research progress of ultrasonic detection of defects in concrete components Zhang Minghua 1,2, Kaile 1,2, Zhao Haihong 1,2, Yu Kechao 1,21 Chongqing Construction Engineering Building Materials Logistics Co., Ltd., Chongqing 401122; 2.
Chongqing building materials and products engineering technology research center, Chongqing 401122 Abstract: ultrasonic testing is a convenient nondestructive testing technology, which can detect all kinds of defects in concrete engineering.
This paper summarizes the test principle, test methods, test defect types and influencing factors of ultrasonic nondestructive testing of concrete members, which provides a certain reference for understanding the research progress of ultrasonic testing of concrete defects.
Keywords: ultrasonic testing; Detection principle; Detection method; Defects; Factors: Research Progress of ultrasonic detection of concrete defect Zhang Minghua 1,2, Kaile 1,2, Zhao Haihong 1,2, Yu Kechao 1,21 ChongqingConstructionEngineeringBuildingMaterials&LogisticsCo.
Ltd.,Chongqing,401122; 2.ChongqingEngineeringTechnologyResearchCenterforBuildingMaterialsandProducts,Chongqing,401122Abstract: Ultrasonictestingisasimpleandconvenientnon-destructivetestingtechnologythatcandetectvariousdefectsinconcreteengineering.
Thisarticlesummarizesthetestingprinciples、testingmethods,typesoftestingdefectsandinfluencingfactorsofultrasonicnondestructivetestingofconcretecomponentdefects,andprovidesacertainreferenceforunderstandingtheresearchprogressofultrasonictestingofconcretedefects.
Keywords: Ultrasonictesting; Testingprinciple; Testingmethod; Defect; Introduction construction engineering is prone to internal defects due to its construction characteristics, which affects the project quality.
Using safe and accurate nondestructive testing technology to detect the quality defects of concrete components without damaging concrete components is the trend of concrete engineering quality testing.
At present, ultrasonic nondestructive testing technology is one of the most widely used methods [1].
It judges the internal compactness of concrete by analyzing the acoustic signal transmitted by ultrasonic wave in concrete, so as to judge the defect distribution and compactness [2].
Ultrasonic nondestructive testing technology has the following advantages: (1) it is easy to carry.
The instrument is generally composed of display screen and transducer, which is small and easy to operate; (2) Good stability.
The propagation speed, wavelength, frequency and energy of ultrasonic wave in concrete structure are stable, which can better reflect its defect distribution from the change of acoustic wave [3]; (3) High safety, no damage to concrete structure, safe use and no damage to operators [4].
Ultrasonic nondestructive testing technology can be applied to a series of concrete structures such as pile foundation, concrete filled steel tubular and mass concrete to effectively evaluate the crack depth of concrete structure, internal defects, void of steel structure and so on.
1 Principle and method of ultrasonic nondestructive testing of concrete defects 1.1 principle of ultrasonic nondestructive testing of concrete defects when there are defects in the concrete, when the ultrasonic propagates to the defect medium, a series of changes such as diffraction, transmission and refraction will occur at the defect interface, resulting in the change of transmission path, and then change its acoustic parameters [5].
The schematic diagram of ultrasonic propagation in concrete [5] is shown in Figure 1.
Fig.
1 Schematic diagram of ultrasonic wave propagation in concrete when ultrasonic wave passes through different defect parts of concrete, due to the change of propagation medium, the acoustic parameters will change regularly..
