Reiwa6Years8Month8On the day,Chiba Institute of Technology Tsudanuma CampusIn21The ``Resources/Materials/Environment'' technology and research exchange meeting (sponsored by Kanto Branch of the Society of Resources/Materials) was held.
at the exchange meeting50Students gave presentations and received the Excellent Poster Award5Among them was Ryosuke Asano, an undergraduate student at our university (Faculty of Marine Resources and Environment, Department of Marine Environmental Science). 4(year) and graduate student Seitaro Iemura (Master's Program in Marine Resources and Environmental Studies, Graduate School of Marine Science and Technology). 2(year) was selected.
The winners are9They have been invited to present their research results at the Resources and Materials Society to be held at Akita University in April.

【Winner】
Ryoo Asano (Faculty of Marine Resources and Environment, Department of Marine Environmental Science) 4Year)
Seitaro Iemura (Master's student in the Department of Marine Resources and Environmental Science, Graduate School of Marine Science and Technology)2Year)

[Details of award-winning research]
Ryo Asano
Title: Investigation into the effects of different compositions of cement-based materials on cement-based materials and sessile organisms in deep-sea environments
In recent years, the utilization of the marine environment, such as resource development and marine energy production, has been attracting attention. To this end, it is considered essential to construct concrete structures on the seabed using cement-based materials. However, the marine environment, especially200mIt is known that in the deep sea environment, below sea level, cementitious materials deteriorate faster than in terrestrial environments due to the unique physicochemical environmental background. Therefore, technological development of cementitious materials that are durable in deep sea environments is required. Based on previous research, we hoped that the function of microorganisms adhering to the surface of cementitious materials may suppress the deterioration of cementitious materials. In this study, we created several types of cement paste test specimens with different types of cement and thickener, immersed them in a deep sea environment for several years, and then retrieved them. The purpose of this study was to clarify the relationship between the composition and mix of cementitious materials and the adhering microorganisms by investigating the microbial flora on the test specimens' surfaces.

Asano

Seitaro Teimura
Title: Elucidation of the protective mechanism of cement-based materials by marine bacteria
In recent years, various deep-sea infrastructure projects are planned to be constructed using the vast sea areas under Japan's jurisdiction, and the development of building materials is required to realize these projects. Previous research in shallow waters has shown that marine bacteria can form biofilms on the surface of cement-based materials, which can suppress the penetration of chloride ions and other substances that cause deterioration of building materials, thereby improving their durability. If such microbial functions (biofilm formation) can be utilized and controlled in deep-sea environments, they may be useful for improving the durability of cement-based materials. In this presentation, we focused on biofilms produced by marine bacteria and proposed an approach to clarify the protective mechanism of cement-based materials.

Teimura-san

From left: Asano-san, Iemura-san

<Related links>
Mining and Materials Society Kanto Branch