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Title |
An Analytical Method for the Evaluation of Micro-cracking in Concrete Shrinkage Induced
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Keywords |
불구속조건 ; 미세균열 ; 음향방출 ; 유한요소해석 ; 내부구속 unrestrained condition ; micro-cracking ; acoustic emission ; finite element analysis ; internal restraint |
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Abstract |
The majority of research that has been performed on cracking potential of concrete by shrinkage has assumed that concrete acts as a homogeneous material. However, with this approach, it is not able to evaluate the micro-cracking behavior in concrete due to autogenous shrinkage under unrestrained boundary condition (free boundary condition) nor to understand the cracking behavior properly because of the heterogeneous nature of concrete. To better understand the micro-cracking behavior of concrete induced by autogenous shrinkage, series of experiments were performed measuring the length change and acoustic emission energy. As an analytical approach, this research uses an object oriented finite element analysis code (OOF code) to simulate the behavior of the concrete on a meso-scale. The concrete images used in the simulations were directly obtained from mortar samples. From the experiments and simulation results, it was able to better understand the micro-cracking behaviour of concrete due to shrinking of paste phase and internal restraint by aggregates.
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