Monitoring of Ageing of Concrete Containments Based on Conditions Assessment by Means of Non-Destructive Testing Methods and Finite Element Analysis

摘要

This paper presents the results of the European 5-th Framework Project with Acronym "CONMOD" [1], which aim was to find a practical means to determine the condition of a containment structure, as well as how this can be expected to change with time. That involves combining advanced finite element analysis (FEA) and the latest non-destructive techniques (NDT), with the aim of establishing the condition of reinforced concrete structures, as well as their present and future behaviour under various loading conditions including the effects of ageing.The quality of the concrete structure is strongly affected by workmanship and construction methods. For any given large structure, the methods of construction will vary, and subsequently so will the quality throughout the structure. Compliance, quality and ageing are related to each other. The ageing factors will vary globally and with depth from the concrete surface depending on the local construction methods, materials and environment.NDT provides combined information about the condition, compliance and ageing of concrete, which is necessary in order to make a realistic evaluation of the significance of these factors in the long term. NDT provides information about the condition of the concrete in an undisturbed state, which means that small changes in the material properties with time can be reliably detected. The results of this work show that a new approach combining non-destructive testing with finite element analysis is a very useful tool for accurate determination and prediction of concrete containment conditions in nuclear power structures~([2]).