Ifsttar PhD subject

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Title : Development of surface-reactive reinforcement for reinforced concrete

Main host Laboratory - Referent Advisor MAST - EMGCU  -  MARCHETTI Mario

Director of the main host Laboratory MARTIN Renaud-Pierre  -

PhD Speciality génie civil ; béton ; ; armatures ; matériaux

Axis of the performance contract 2 - COP2017 - More efficient and resilient infrastructure

Main location Marne-la-Vallée

Doctoral affiliation UNIVERSITE DE LIMOGES

PhD school

Planned PhD supervisor MARCHETTI Mario  -    -

Planned financing Contrat doctoral  - Université Gustave Eiffel

Abstract

Corrosion of steel reinforcement is the main cause of damage to reinforced concrete structures. Repairs are based on patching operations or electrochemical treatments using currents. These approaches continue to provide solutions. There is an abundant literature on coatings and the selection of steels to increase the durability of these reinforcements, but all have limitations.
Recently, another approach has been initiated and is based on the use of plasma deposition. A plasma process developed by IrCer's SAFIR platform aims to achieve a physical (mechanical anchoring) / chemical (affinity) bond between the metal and the sprayed deposit. The composition of the deposit has multiple aims, both to make the surface of the reinforcement reactive to the cementitious matrix covering the reinforcement and thus to confer a stainless steel character by a judicious choice of the chemical composition of the deposit, but also to obtain a chemical continuum between the reinforcement and the cementitious matrix (metallic sub-layer or composition gradient cermet). The composition of the cermet should be adapted to the cement used and to the environment in which the reinforcement will be used.
The study will first be carried out on a flat support made from a steel representative of those used for reinforcement. Reactive cement phases will be selected (composition, purity, particle size, etc.) and preliminary plasma application tests will be carried out to determine the optimum deposition conditions (type of flame, flame temperature, powder flow rate) ....
This stage will be followed by morphological characterisations (optical microscopy, Raman, SEM, FTIR) to determine the thickness of the steel affected by the deposit and how it is affected, the thickness of the pure phase deposit and the possible evolution of this pure phase, and the thickness of the steel-deposit interface, as well as by standardised approaches to corrosion resistance.

Keywords : civil engineering ; concrete; reinfdorcement ; materials ; plasma

Main host Laboratory - Referent Advisor	MAST - EMGCU - MARCHETTI Mario
Director of the main host Laboratory	MARTIN Renaud-Pierre -
PhD Speciality	génie civil ; béton ; ; armatures ; matériaux
Axis of the performance contract	2 - COP2017 - More efficient and resilient infrastructure
Main location	Marne-la-Vallée
Doctoral affiliation	UNIVERSITE DE LIMOGES
PhD school
Planned PhD supervisor	MARCHETTI Mario - -
Planned financing	Contrat doctoral - Université Gustave Eiffel
Abstract Corrosion of steel reinforcement is the main cause of damage to reinforced concrete structures. Repairs are based on patching operations or electrochemical treatments using currents. These approaches continue to provide solutions. There is an abundant literature on coatings and the selection of steels to increase the durability of these reinforcements, but all have limitations. Recently, another approach has been initiated and is based on the use of plasma deposition. A plasma process developed by IrCer's SAFIR platform aims to achieve a physical (mechanical anchoring) / chemical (affinity) bond between the metal and the sprayed deposit. The composition of the deposit has multiple aims, both to make the surface of the reinforcement reactive to the cementitious matrix covering the reinforcement and thus to confer a stainless steel character by a judicious choice of the chemical composition of the deposit, but also to obtain a chemical continuum between the reinforcement and the cementitious matrix (metallic sub-layer or composition gradient cermet). The composition of the cermet should be adapted to the cement used and to the environment in which the reinforcement will be used. The study will first be carried out on a flat support made from a steel representative of those used for reinforcement. Reactive cement phases will be selected (composition, purity, particle size, etc.) and preliminary plasma application tests will be carried out to determine the optimum deposition conditions (type of flame, flame temperature, powder flow rate) .... This stage will be followed by morphological characterisations (optical microscopy, Raman, SEM, FTIR) to determine the thickness of the steel affected by the deposit and how it is affected, the thickness of the pure phase deposit and the possible evolution of this pure phase, and the thickness of the steel-deposit interface, as well as by standardised approaches to corrosion resistance.
Keywords :	civil engineering ; concrete; reinfdorcement ; materials ; plasma

List of topics

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