Early Estimation Method for Material Permeability and Deterioration Resistance of Concrete

2022 Fiscal Year Final Research Report

• Project/Area Number: 19K04552
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 22010:Civil engineering material, execution and construction management-related
• Research Institution: Okayama University
• Principal Investigator: Fujii Takashi 岡山大学, 環境生命科学学域, 准教授 (10537236)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: 早期推定試験 / 凍結融解試験 / 小型供試体 / 塩化物イオン浸透性 / 薄片 / 非定常電気泳動法 / 飽和塩化物イオン量

Outline of Final Research Achievements

In this study, it was investigated that a method that can perform the test in a relatively short time, which requires more than half a year with the method standardized by JIS. In the freeze-thaw test, it was shown that deterioration can be confirmed in about half the period by using a small specimen of φ75×150mm. In addition, the chloride ion permeability test showed that it is possible to estimate the apparent diffusion coefficient of mortar by using a thin piece of 2 mm thickness, even if the mortar has high salt barrier properties. On the other hand, in concrete, it is difficult to obtain the apparent diffusion coefficient from a thin piece, and the unsteady electrophoresis method is effective. It is necessary to clarify the relationship while collecting data in the future.

Free Research Field

コンクリート工学

Academic Significance and Societal Importance of the Research Achievements

コンクリート構造物の耐久性設計では，実際のコンクリートの結果がない場合には，種々の予測式や推奨値を利用される．一方で，多くの高耐久を実現する材料が開発されており，これらを用いて構造物を設計する場合には，予測式や推奨値の適用外となるため，耐久性に関する値が必要となる．迅速に使用するコンクリートの浸透や劣化の抵抗性が把握できれば，より適切で経済的な構造物の設計が可能になる．