Non-destructive testing method for internal voids in concrete under low heat input conditions
An input condition, non-destructive testing technology, applied in the field of civil engineering, can solve the problems of small detection working surface, inability to use high-power heat source equipment and large-volume equipment, etc., achieve high adaptability, reduce manual intervention, and speed up detection Effect
Active Publication Date: 2021-03-26
RES INST OF HIGHWAY MINIST OF TRANSPORT
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Problems solved by technology
[0003] Different from indoor non-destructive testing, for concrete structures, especially for concrete bridge structures in the field environment, because they are often located in remote locations far from towns, and the working surface available for testing is small, it is impossible to use high-power heat sources Equipment and bulky equipment
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[0081] Non-destructive testing method for concrete internal cavity under low calorific input conditions, including: in the detection environment is 0 ~ 40 ° C, the humidity is not more than 90%, no condensation, no wind speed does not exceed 5m / s, to remove to detect The surface of the surface of the concrete bridge structure, the surface is brush painted, and the ceramic radiator or halogen tube is adjacent to the surface of the concrete bridge structure to be detected, and the ceramic radiator or halogen lamp is heated within 1 min. From 100 ° C, heated to the surface to 50 ° C, the surface of the heated concrete bridge structure was subjected to infrared thermal imaging, using an infrared thermal imager continuously shooting an infrared image and saved, the performance indicator of the infrared thermal imager should comply with: the detection range -40 ~ 500 ° C; temperature resolution should be less than 0.05 ° C (at 30 ° C); the detection accuracy is within ± 1.0 ° C; the r...
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Abstract
The invention discloses a non-destructive testing method for an internal cavity of concrete under a low heat input condition. The method comprises: heating a concrete bridge structure to be tested, sothat the temperature difference of a surface temperature rise of the concrete bridge structure to be tested is 3 to 5 DEG C, and the surface temperature is not more than 50 DEG C; performing infraredthermal imaging on the surface of the heated concrete bridge structure; performing principal component analysis and correlation analysis on an infrared thermal image sequence to determine the position and size of an internal cavity. According to the method, under the low heat input condition, damage to a concrete structure is avoided, the speed of testing is accelerated, the installation of equipment is facilitated, and an infrared thermal imaging non-destructive testing technology for the internal cavity of the concrete can be practical.
Description
Technical field [0001] The present invention relates to the field of civil engineering technology. More specifically, the present invention relates to a non-destructive detection method for the internal cavity of concrete inside the concrete under low heat input conditions. Background technique [0002] Infrared imaging testing technology earliest appeared in the United States in the 1960s. The technology started late in my country. In the early 1990s, my country has intensively combines infrared imaging diagnostic technology and civil engineering, and is carried out in building heat loss, construction materials defect detection and construction exterior wall construction quality. Preliminary application research. Infrared imaging technology is a new, sensitive detection method, which is important to scales quickly, non-contact, large area to detect the surface of the detection object, and do not damage the detection, and the results are intuitive, easy to achieve automation and ...
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IPC IPC(8): G01N21/3563G01J5/00
CPCG01J5/00G01J2005/0077G01N21/35
Inventor 张劲泉安宁和海芳
Owner RES INST OF HIGHWAY MINIST OF TRANSPORT