Infrared Thermographic Inspection Technology's Application In The Field Of Civil Engineering

To conduct evaluation of the construction-completed concrete bridges, high-rise buildings, viaducts and dams, solve the low-efficiency, high-cost and unsafe method of the conventional way to locate the hidden hazard of the concrete structure and realize fast, safe, large-scale detection of concrete distress, cavity and the outer wall peeling off of high-rise buildings is a major task for the civil engineering circle from home and abroad to address and is significant in social needs and economic benefits. Thanks to the complicated detection environment and condition, however, modern buildings mainly consist of uneven reinforced concrete is anisotropic composite material, with complicated structure and disperse property, so the infrared thermographic inspection technology is not applied in the filed of civil engineering as universally as in other industrial fields.This thesis researches into the theory of applying the infrared thermographic inspection technology to detecting faults in concrete. Based on some relevant achievements and with finite modeling computation, this thesis probes into the principle and method of nondestructive inspection of concrete default and expand the application of the infrared thermographic inspection technology to civil engineering. To this end, this thesis research into the following aspects:1. Based on the current concrete fault detection method, this thesis introduces the infrared thermographic inspection technology.2. According to the heat emission law, this thesis researches into the heat conduction capacity of the concrete and elaborates the principle and method of the infrared thermographic inspection technology's application to detecting faults in concrete and its application in the field of civil engineering.3. Based on the heat conduction theory and heat conduction diferetial equation, and the thermo properties of the concrete, this thesis derives the theoretical formula of the fault depth of the concrete.4. With finite element software, this paper conducts numerical modeling of the infrared thermographic inspection technology's application to detecting faults in concrete, and tests the feasibility and application scope of the formula. 5. This thesis further expands the infrared thermographic inspection technology's application to the filed of civil engineering, particularly in the filed of reinforcement engineering.Finally, this thesis puts forward some issues yet to be research in depth.