Publication

Non-Destructive Determination of Chloride and Water Content in Concrete Using Ground Penetrating Radar

Alexis Kalogeropoulos
2012
Theses

Abstract

Corrosion of rebar within reinforced concrete is a major problem for countries where salt is applied to roads for deicing. Concrete structures are periodically inspected in order to monitor possible damage caused by chloride-induced corrosion of the reinforce- ment. However, the available drilling and visual inspections do not supply sufficient spatial information or can only be assessed in advanced stages of corrosion, respectively. Conse- quently, the condition of bridge decks can only be assessed with low certainty. Therefore, a spatially continuous and non-destructive method detecting chloride in concrete structures is desirable. This Ph.D. thesis deals with the non-destructive monitoring of chloride ion con- centration inside the concrete of bridge decks, in the case of seasonal exposition to chlo- rides. Novel Ground Penetrating Radar data processing methodologies and their prerequi- sites are presented. An experiment recreating chloride contamination processes in concrete was designed. From it, a Ground Penetrating Radar dataset was acquired. The dataset was processed with these novel methodologies. The results analysis enabled the constitution of empiric relationships linking concrete condition and Ground Penetrating Radar datasets.

Official source

https://infoscience.epfl.ch/entities/publication/6ba6ccd5-53ce-417a-86eb-d1b9aa3a177c

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Alexis Kalogeropoulos
2012
Theses

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/6ba6ccd5-53ce-417a-86eb-d1b9aa3a177c

About this result

Related concepts (25)

Reinforced concrete

Reinforced concrete, also called ferroconcrete, is a composite material in which concrete's relatively low tensile strength and ductility are compensated for by the inclusion of reinforcement having higher tensile strength or ductility. The reinforcement is usually, though not necessarily, steel bars (rebar) and is usually embedded passively in the concrete before the concrete sets. However, post-tensioning is also employed as a technique to reinforce the concrete. In terms of volume used annually, it is one of the most common engineering materials.

Types of concrete

Concrete is produced in a variety of compositions, finishes and performance characteristics to meet a wide range of needs. Modern concrete mix designs can be complex. The choice of a concrete mix depends on the need of the project both in terms of strength and appearance and in relation to local legislation and building codes. The design begins by determining the requirements of the concrete. These requirements take into consideration the weather conditions that the concrete will be exposed to in service, and the required design strength.

Concrete

Concrete is a composite material composed of aggregate bonded together with a fluid cement that cures over time. Concrete is the second-most-used substance in the world after water, and is the most widely used building material. Its usage worldwide, ton for ton, is twice that of steel, wood, plastics, and aluminium combined. When aggregate is mixed with dry Portland cement and water, the mixture forms a fluid slurry that is easily poured and molded into shape.

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