Tc-To법에 의한 콘크리트 균열측정

Tc-To Method in Measurement of Concrete Crack

  • 발행 : 1997.06.01

초록

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.

키워드

참고문헌

  1. Control of Cracking in Concrete Structures ACI Committee 224
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  4. 최신 콘크리트공학 한국콘크리트학회
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  6. Concrete Structure,Properties,and Materials P.Kumar Mehta
  7. Journal of the ACI v.81 no.2 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.
  8. 한국농공학회지 v.37 no.3;4 고성능 경량 폴리머 콘크리트의 역학적 특성에 관한 실험적 연구 성찬용
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