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Contenido archivado el 2024-04-30

Research and development of a new process to extend the lifespan of concrete structures by natural desalination and realkalization

Objetivo


The objectives of this project have been met. Tasks 1 and 2 have permitted to propose and select, after an impressive series of tests on concrete samples, the best couple anode-electrolyte. Samples of anode materials with various densities have been produced. Best results for chloride extraction and realkalisation were obtained with the following couple 9Al/AlMg3/NaOH 2M.
The principles of the data acquisition system and of the regulation equipment have been set up in Task 3. This system will permit to monitor the loss of water in the paste and re-humidify it to restore an efficient galvanic current. Task 4 has investigated the secondary effects of the treatment on structures potentially reactive to ASR. No effects were recorded on carbonated concrete; However a treatment on fully chloride contaminated structures would induce a significant ASR expansion.
A specific application pump and extrusion devices have been developed and successfully tested within Task 5. Also a polymer modified cement-based coating has been tested. It reduces significantly further ingress of CO2 and chloride after treatment.
Finally, Task 6 was scheduled to work on proposed European standards. The last draft of prEN 14038 includes now recommendations on electrochemical treatment of reinforced concrete by using galvanic current.
The main goal of this protect is to develop a new process, easy to apply, which creates at the same time a desalination, or chloride extraction and a realkalisation of the concrete. This research will help to preserve reinforced concrete structures of deterioration due to corrosion of steel reinforcement since the corrosion mechanism is directly linked with the depassivation of concrete (carbonation) and the ingress of chlorides (due to deicing salts for instance). It will permit to increase the lifespan of these structures. Economical interests and safety profits are obvious. At this moment, the realkalisation and chloride extraction can be obtained using an external electric power supply. Here, the idea is to develop an electrolytic paste with a sacrificial anode (which is applied on the concrete surface and use the current produced by the cell (like an ordinary battery) formed when the anode (in the developed electrolyte) is relied to the reinforcement. The created battery pumps out the chloride ions for the desalination and generates hydroxides for the realkalisation. A feasibility analysis has been conducted and has provided encouraging results. The SME proposers manufacture specific concrete additives metals, sensors and measuring devices, automatic regulation systems and shotcreting equipments. They would like to work with RTDs dedicated to study and specify the best composition of the product, to test it in laboratories, to determine the side effects and characterize its efficiency.

Programa(s)

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Tema(s)

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CRS - Cooperative research contracts

Coordinador

Samaco B.V
Aportación de la UE
Sin datos
Dirección
Coenecoop 47
2740 AK Waddinkeen
Países Bajos

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Coste total

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Participantes (9)

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