Abstract

Concrete is said to have a high degree of extensibility when it is subjected to large deformations without cracking. The cracking behavior of concrete in the field may even be more complex. For example, in mass concrete compressive stresses are developed during the very early period when temperatures are rising, and the tensile stresses do not develop until at a later age when the temperature begins to decline. Actual cracking and failure depend on the combination of factors and indeed it is rarely that a single adverse factor is responsible for cracking of concrete. The importance of cracking and the minimum width at which a crack is considered significant depend on the conditions of exposure of the concrete. The ultrasonic pulse measurements can be used to detect the development of cracks in structures such as dams, and to check deterioration due to frost or chemical action. An estimate of the depth of a crack visible at the surface can be obtained by measuring the transit times across the crack for two different arrangements of the transducers placed on the surface. In this paper, the concrete cracks that artificially introduced crack width is 1 and 2mm, crack depth is 2, 4, 6, 8cm were measured by Tc-To Method In consequence, the measured depth was increased with increase of measuring distance from concrete crack. The most reliable results were shown when the introduced crack width was 1mm, and the measuring distance was 10cm from concrete crack.

주제어

#균열 깊이   #균열 폭   #초음파전달속도  

저자의 다른 논문

참고문헌 (9)

1. 양생조건이 경량골재 콘크리트의 ARS에 미치는 영향 , 성찬용;김성완;민정기 , 한국농공학회지 / v.35,pp.38-46, 1993
   원문보기 상세보기
2. 고성능 경량 폴리머 콘크리트의 역학적 특성에 관한 실험적 연구 , 성찬용 , 한국농공학회지 / v.37,pp.72-81, 1995
   원문보기 상세보기
3. Neville. , Properties of concrete / v.,pp., 1981
   
4. P.Kumar Mehta , Concrete Structure,Properties,and Materials / v.,pp.334-342, 1986
   
5. 한국건설기술연구원 , 국내 콘크리트 구조물의 내구성 평가를 위한 조사연구 / v.,pp.477-517, 1989
   
6. 콘크리트 구조물의 균열체계에 따른 균열제어와 대책 , 최완철 , 콘크리트학회지 / v.6,pp.17-24, 1994
   원문보기 상세보기
7. The use of pulse velocity measurements to estimate strength of air-dired cubes and hence in situ strength of concrete , Swamy,R.N.;A.H.Al-Hamed. , Journal of the ACI / v.81,pp.247-276, 1984
   
8. ACI Committee 224 , Control of Cracking in Concrete Structures / v.,pp.42, 1989
   
9. 한국콘크리트학회 , 최신 콘크리트공학 / v.,pp.47-517, 1993
   

이 논문을 인용한 문헌 (0)

1. 이 논문을 인용한 문헌 없음