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Modeling on Ultrasonic Velocity in Concrete Considering Micro Pore Structure and Loading Conditions

공극구조 및 하중조건에 따른 콘크리트의 초음파 속도 모델링

  • Received : 2014.11.19
  • Accepted : 2014.01.20
  • Published : 2015.03.28

Abstract

For a long time, evaluation of soundness and strength in concrete has been performed through ultrasonic velocity(UV), which is essential work in field assessment. Porosity in concrete is a major parameter indicating durability and strength, and UV passing concrete depends on porosity variation. In this paper, a modeling on UV through concrete is carried out considering porosity and the results are verified with those from test. Additionally UV in concrete under compression/tension loading condition is measured and UV modeling with loading condition is performed. Up to 50% of loading ratio, UV slightly increases and greatly drops at peak load in compression region, however it fluctuates in tensile region due to micro cracking in matrix. The proposed model shows a reasonable agreement with test results in control and compression region, and needs modification for tensile region considering micro cracks and local aggregate interlocking.

Keywords

Ultrasonic Velocity;Durability;Porosity;Modeling;Tensile Stress;Compressive Stress

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Acknowledgement

Grant : FRP Hybrid Bar를 활용한 해양항만구조물 수명향상 기술 개발

Supported by : 한국건설기술연구원