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Computers and Concrete
  Volume 3, Number 6, December 2006, pages 423-437

Numerical modelling and finite element analysis of rnstress wave propagation for ultrasonic pulse velocity testing of concrete
Ismail Ozgur Yaman, Zekai Akbay and Haluk Aktan

    Stress wave propagation through concrete is simulated by finite element analysis. The concrete medium is modeled as a homogeneous material with smeared properties to investigate and establish the suitable finite element analysis method (explicit versus implicit) and analysis parameters (element size, and solution time increment) also suitable for rigorous investigation. In the next step, finite element analysis model of the medium is developed using a digital image processing technique, which distinguishes the mortar and aggregate phases of concrete. The mortar and aggregate phase topologies are, then, directly mapped to the finite element mesh to form a heterogeneous concrete model. The heterogeneous concrete model is then used to simulate wave propagation. The veracity of the model is demonstrated by evaluating the intrinsic parameters of nondestructive ultrasonic pulse velocity testing of concrete. Quantitative relationships between aggregate size and testing frequency for nondestructive testing are presented.
Key Words
    concrete; nondestructive testing; ultrasonic pulse velocity; finite element analysis; explicit dynamic analysis; digital image processing; heterogeneous model.
Ismail Ozgur Yaman; Middle East Technical University, Civil Engineering Department, Ankara, 06531, TurkeyrnZekai Akbay; DaimlerChrysler AG, Truck Group, Sindelfingen, 71059, GermanyrnHaluk Aktan; Wayne State University, Department of Civil and Environmental Engineering, 5050 Anthony Wayne Dr. #2164, Detroit, MI, 48202, USA

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