Development of Self-healing Eco-mortars

il y a 2 semaines

Rennes, France Institut National des Sciences Appliquées de Rennes (INSA Rennes) Temps plein

**Development of self-healing eco-mortars**:

- Réf
- **ABG-114645**
- Sujet de Thèse- 23/05/2023- Autre financement public- Institut National des Sciences Appliquées de Rennes (INSA Rennes)- Lieu de travail- Rennes - Bretagne - France- Intitulé du sujet- Development of self-healing eco-mortars- Champs scientifiques- Génie civil, BTP
- Matériaux

**Description du sujet**:
**CONTEXT**
- The need to repair concrete structures is nowadays critical as most infrastructures and buildings are counting several decades of service life. One of the main degradations observed on these structures is the steel reinforcement corrosion and the bursting of their concrete coating affecting the structural functionality and leading sometimes to partial ruin. Repairing these damages to recover the initial material performances and to extend the structure service life has a significant cost for the contracting authority. Furthermore, it was estimated by the CONREPNET project that almost 50% of repairs and interventions exhibit signs of failure within five years. Owners indicated that improvements are needed in the way protection and repair of concrete structures are carried out.- The present PhD topic aims to design self-healing eco-mortars
- ** **to replace defective or contaminated concretes and to protect steel reinforcement. The originality consists in designing a binder coupling several types of mineral additions valorizing local products and industrial by-products, optimizing their performances and durability by introducing novel
- ** **repair durability indicators. The approach will allow reducing the environmental impact of the repaired structures, but also the repair cost by improving the material lifespan. Indeed, self-healing is best used in a preventive manner, to increase the service life and to reduce the maintenance costs of a repaired structure.**DESCRIPTION OF THE PhD THESIS**
- The research project aims to design self-healing eco-mortars to replace defective or contaminated concrete protecting the steel reinforcement. The project promotes local products and industrial by-products to design self-healing materials by optimizing their performances and their durability. The research focuses on the hydration process of mineral additions, its optimization to ensure crack healing and the development of repair durability indicators. To achieve these objectives, a multi-scale experimental campaign coupled with numerical modeling will be followed, comprising three parts:
**_P1. Hydration and healing process of hydraulic binders_**
- _ _will be investigated: Blast-Furnace Slag, Fly Ash and Metakaolin. These mixtures are generally regarded as Alkali-Activated Materials as they combine an alkali metal source with a solid silicate powder. A first step in the eco-mortar design is to define a combination of mineral additions (types and content) to satisfy two conditions: an adequate content of unreacted particles available for further reactions to heal the crack, and a compressive strength respecting the strength class of repair materials.
- ** **In a second step, this autogenous healing process will be coupled with an autonomous healing process thanks to the encapsulation of healing agents. To generate a 3D numerical sample with these different constituents, numerical developments will be carried out on a MATLAB code that it is used today at the Laboratory of Civil Engineering and Mechanical Engineering(LGCGM) to generate 3D porous structures with spherical particles.**_P2. Repair durability indicators_**
- In order to limit the cracking risk and to improve the repair durability, the project will introduce durability indicators for repair materials (sound and healed), focusing on the incompatibilities between the repair and its support. More specifically, the delayed deformations (shrinkages, creeps) will be studied at different scales thanks to original experimental means (mechanical tests into a SEM, e.g.). An innovative aspect of the project is the fact that the relaxation capacity will be experimentally determined with tensile creep and relaxation tests. Indeed, the relaxation capacity of hydraulic binders is usually estimated using only compressive creep tests. As the main objective of repair is to provide an adequate protection against the penetration of aggressive agents to concrete, it is also important to correctly assess the transport properties of eco-mortars, particularly the effect of healed cracks. A numerical model will be developed to predict the cracks clogging due to the growth of new solid phases and to determine how the ionic species diffusion are affected by the autogenous and autonomous healing processes. The multiscale numerical model will be used to validate the durability indicator for healed mortars and to estimate the effect of content and size distribution of encapsulated healing agents on effective diffusion coefficient via a numerical parametric study to optimize the mortars design. Finally

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