Clarification of morphology of pore structure based on the high-precision 3D information of geometric structure

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K14800
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 22010:Civil engineering material, execution and construction management-related
• Research Institution: Tokyo Metropolitan University (2022); The University of Tokyo (2020-2021)
• Principal Investigator: Kamada Tomohisa 東京都立大学, 都市環境科学研究科, 助教 (70804194)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: セメント硬化体 / 高炉スラグ微粉末 / 空隙構造 / 幾何学的構造 / 三次元微細構造 / FIB-SEM / 3Dイメージング

Outline of Final Research Achievements

The objective of this research was to generate new insights on microstructure of pore structure of hardened cement using FIB-SEM and to clarify the influence of the geometric structure of pores on mass transfer. Firstly, 3D observations of pore structure of hardened cement using FIB-SEM indicated that hardened cement with blast furnace slag (BFS) had more continuous and complex network of pore compared to hardened cement with ordinary portland cement (OPC). Furthermore, the results of water penetration tests clarified that hardened cement with BFS showed higher water absorption but shallower water penetration depth compared to hardened cement with OPC. These results suggested that the high connectivity of pores in hardened cement with BFS allows water to penetrate comprehensively within the complex pore network, thereby potentially inhibiting water penetration in depth direction.

Free Research Field

コンクリート工学

Academic Significance and Societal Importance of the Research Achievements

セメント硬化体空隙の幾何学的構造が物質移動に及ぼす影響の詳細な理解は、物質移動を精緻に予測可能なモデルの構築や幾何学的構造に起因する物質侵入抑制メカニズムの解明に貢献しうる。本研究では、高炉セメント硬化体空隙の三次元微細構造に関する視覚的情報を取得するとともに、高炉セメント硬化体特有の水分浸透性状と空隙の幾何学的構造との関係性に関する新たな知見を得た。これは、高炉セメント硬化体の水分浸透抑制メカニズムの解明ならびに物質移動モデルの発展に寄与するものであると考える。