Detection of shallow voids in concrete structures with impulse thermography and radar

被引：48

作者：

Maierhofer, C ^{[1
]}

Brink, A ^{[1
]}

Röllig, M ^{[1
]}

Wiggenhauser, H ^{[1
]}

机构：

[1] Fed Inst mat Res & Testing BAM, D-12205 Berlin, Germany

来源：

NDT & E INTERNATIONAL | 2003年 / 36卷 / 04期

关键词：

impulse thermography; radar; non-destructive testing; concrete; civil engineering;

D O I：

10.1016/S0963-8695(02)00063-4

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

New thermography systems enable the application of active investigation techniques, i.e. the observation of the cooling down process after heating the surface of a structure under investigation. Defects like voids in concrete having a different thermal diffusivity in comparison to the bulk material are visualised by different surface temperatures. The differences between temperature transient curves above sound regions and above inhomogeneities are expected to include information about the defect parameters. Experimental investigations with impulse thermography and radar on a concrete test specimen containing voids were analysed. Radar was used to determine the depth of the voids. The influence of size and depth of the voids on the temperature transient curves was studied for different heating times. The transient curves were also fitted with a simple semi-empirical model. (C) 2003 Elsevier Science Ltd. All rights reserved.

引用

页码：257 / 263

页数：7

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