David, D D (2007) Numerical platform to validate resistivity testing for NDE of civil engineering structures. PhD thesis, Wayne State University, USA.
Abstract
The problem of accuracy and time management assessment of the deterioration of concrete structures has long been a problem for the civil engineering industry. Since time management has been a growing problem, there has been a concerted demand for development of Non-Destructive Testing techniques to enable accurate assessment of the condition of concrete structures. Electrical resistivity techniques can provide methods for rapid and accurate condition assessment of reinforced concrete structures. Electrical resistivity techniques can be used to assess the properties of concrete structures. Moisture content and corrosion rate can be determined by electrical resistivity methods. Many reinforced concrete structures have given excellent service with minimal maintenance. However, as the infrastructure ages, it becomes more apparent that some environments are more severe than originally thought, and some construction and design problems have led to lower service lives and higher maintenance costs than originally envisioned. The worst of these problems is caused by corrosion of steel in concrete, either due to carbonation or chloride attack. One of the latest estimates from the USA is that the cost of damage due to deicing salts alone is between $325 and $1000 million per year to bridges and car parks. In the UK the Department of Transport estimates a total repair cost of £616. 5 million due to corrosion damage to motorway bridges. These bridges represent about 10% of the total bridge inventory in the UK. The total problem may therefore be ten times the DOT estimate. There are similar statistics for Europe and particularly the Middle East. Deterioration occurs on buildings and other structures as well as bridges (Broomfield et al. 2000). The ability to assess the severity of rebar corrosion in existing structures and to predict the remaining service life is thus becoming increasingly important. The driving force behind this study was based on the inconsistencies of vendor descriptions on how to interpret results from a resistivity testing instrument. The concern comes into effect when measurements are taken and interpretation of corrosion presence must be identified. Therefore a spectrum is required to be developed to consider these inconsistent regions to interpret the resistivity measurement results. A numerical model to validate resistivity testing for Non-Destructive Evaluation of Civil Engineering Structures was generated to develop such a spectrum. This dissertation details the numerical analysis development procedure to validate resistivity testing. This numerical model provides the platform for developing a spectrum during electrical resistivity measurements of Civil Engineering Structures.
| Item Type: | Thesis (Doctoral) |
|---|---|
| Thesis advisor: | Aktan, H M |
| Uncontrolled Keywords: | Europe; Middle East; UK; accuracy; bridge; car parks; civil engineering; concrete structures; corrosion; deterioration; inventory; measurement; non-destructive testing; numerical analysis; reinforced concrete; service life; time management |
| Index terms: | presence, rebar, maintenance cost, concrete structure, dissertation, statistics, estimate, testing, Europe, becoming, platform, inventory, carbonation, moisture content, non-destructive testing, time management, service life, car park, numerical model, reinforced concrete, corrosion, repair, deterioration, Middle East, accuracy, numerical analysis |
| Subjects: | philosophical process, asset management, inventory management, digital design, physical geography and landforms, structural engineering, maintenance engineering, professional practice, environmental science, materials science, research dissemination and communication, infrastructure and transport systems, project controls, material properties and characteristics, professional development, financial management, data analysis and analytics, financial and cost management, material degradation and durability, building materials, modelling and simulation, mathematical modelling |
| Topics: | Sustainability, Geographical Context, Engineering Principles, Supply Chain Management, Business Strategy, Cost Management, Research Practice, Construction Materials, Information Management, Time Control, Digital Applications |
| Descriptive scope: | 3 PCA |
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