2D finite element simulation of air-coupled impact echo testing on concrete slab

10th Asia Pacific Structural Engineering and Construction Conference 2018

工业技术（总论）

Norinah, A.R.^1 ; Adnan, F.N.^1 ; Hamid, R.^1

Smart and Sustainable Township Research Centre, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, UKM Bangi, Selangor

43600, Malaysia^1

关键词: 2D finite element simulation;    Air-coupled sensors;    Concrete surface;    Concrete thickness;    Conventional concrete;    Impact-echo testing;    Test configurations;    Two-dimensional finite element analysis;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/513/1/012016/pdf
DOI  :  10.1088/1757-899X/513/1/012016

学科分类：工业工程学

来源: IOP

【 摘 要 】

Impact-echo is an effective method in identifying and detecting delamination in concrete structures. Recently, the contact sensor is replaced with air-coupled sensor due to the interest in rapid testing method. This paper presents a study of the optimum test configuration of air-coupled impact echo and conventional concrete-coupled impact echo tests by means of numerical simulation. Two-dimensional finite element analyses were performed on concrete slab to investigate the effect of impact-to-sensor distance and sensor height from concrete surface. Two concrete slabs, one without delamination and one with delamination, were modelled. For intact concrete, both sensors were effective in detecting concrete thickness at any point within the specified location range. However, for air-coupled IE performed on concrete with 40 mm delamination depth, optimum sensor location is 60 to 100 mm away from impact point at height of 10 mm.