THE OPPORTUNITY - CONTEXT OF THE MISSIONS Global demand for resilient coastal defense has made engineered structures like breakwaters and marine caissons essential components of modern maritime infrastructure. As a leader in sustainable building solutions, Holcim focuses not only on the structural performance of its materials but also on maximizing the ecological value these structures provide. Bioreceptivity is the material's intrinsic capacity to promote the rapid, healthy development of life, beginning with primary biofilms. The bioreceptive surfaces function as effective habitats, accelerating the colonization of marine life and supporting the restoration of local ecosystems, directly addressing the growing requirement for Eco-Engineered solutions. This six-month internship focuses on optimizing the synergistic interplay between material chemistry and surface texture to maximize bioreceptive potential. Specifically, the research aims to confirm and quantify the following effects on concrete bioreceptivity through controlled laboratory studies: MISSIONS Cementitious and chemical additions: Quantify the efficacy of specific chemical agents and cement additives on the bioreceptivity of the concrete matrix. Physical properties: Validate the principle that specific surface roughness/texture can enhance the biofilm growth. The intern will deliver a Master 2 thesis report and a final presentation, furnishing quantitative data that will be instrumental in establishing material guidelines for maritime concrete. This will enable the optimization of surface finish and material selection to achieve boosted ecological value. DESIRED PROFILE DESIRED SKILLS Soft skills: Proactive and curious, Able to work independently as well as collaboratively, Possess strong problem-solving abilities. Hard skills: Solid background in materials science, particularly with cementitious materials, Experience with laboratory experimental work. Knowledge of marine eco-engineering principles would also be a significant advantage. EDUCATIONAL LEVEL : TRAINING Master's degrees in Materials Science, Construction Materials, Civil Engineering, or Marine Eco-Engineering. Spoken languages : Fluency in English is essential, and proficiency in French would be beneficial for daily interactions within the team. FURTHER INFORMATION Duration: 6 Months Start date: Mid February to the beginning of March 2026 (flexible) Holcim site (Holcim Innovation Center): Saint-Quentin-Fallavier, approximately 30 km east of Lyon (accessible by public transport). Do you want to work in an international and dynamic working environment that helps you to grow? We are looking for future talents to join our team to build progress for people and the planet.