Effect of Microstructure Densification by Carbonation and Pozzolanic Reaction on Material Permeability of Hardened Materials

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K04638
• 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: Akita University
• Principal Investigator: Tokushige Hidenobu 秋田大学, 理工学研究科, 教授 (80291269)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: コンクリート / フライアッシュ / もみ殻灰 / 強熱減量 / 密度 / 比表面積 / フレッシュ性状 / 圧縮強度

Outline of Final Research Achievements

Based on the results of this study, it is possible to determine the amount of each chemical admixture by examining the ignition loss, specific surface area, and density of JIS IV class ash, and to mix concrete that satisfies the required performance. became clear. In addition, it was suggested that it is possible to construct a mixing design method that achieves appropriate densification by statistical processing of fly ash quality and concrete properties and machine learning techniques. It was also found that there was no problem with the elution of harmful substances from concrete using JIS IV class ash.
In addition, as a result of examining the relationship between the mix ratio and strength of concrete using various types of rice husk ash, the progress of densification due to the pozzolanic reaction was clarified.

Free Research Field

コンクリート工学

Academic Significance and Societal Importance of the Research Achievements

強熱減量や比表面積にバラツキの多いJIS IV種フライアッシュと，ボイラー排出もみ殻灰を用いて，ポゾラン反応に伴うコンクリート硬化体組織の緻密化に対して検討を行った。品質に変動を伴うポゾラン材料を用いる際のコンクリートの配合設計法に対して，重回帰分析を用いた適切な統計処理が有効であることを明らかにし，また各種有害物質の溶出が問題ないことも明らかにした。これらの成果は，特に社会的意義を有するものと考えられ，また平易な重回帰分析によって配合設計法を構築することが可能であることは学術的意義にも通用するものと考えられる。