Uniform deformation of aggregate and paste with higher adhesive force for maximizing aggregate content in fresh concrete maintaining the level of self-compacting performance

2021 Fiscal Year Final Research Report

• Project/Area Number: 19H02217
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 22010:Civil engineering material, execution and construction management-related
• Research Institution: Kochi University of Technology
• Principal Investigator: Ouchi Masahiro 高知工科大学, システム工学群, 教授 (80301125)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 自己充填コンクリート / 高流動コンクリート / 自己充填性能 / フレッシュコンクリート / 粘着力 / 剥離 / 回転粘度計 / 粘度

Outline of Final Research Achievements

Two types of adhesion strength of fresh mortar or paste to the surface of aggregate in self-compacting concrete were measured: in-plane and outside adhesion strengths. A method for measuring in-plane adhesion strength was newly defined as the peel strength between the surface of fresh mortar or paste and the rotor of the rotating viscometer. The outside adhesion strength was measured by the conventional texture analyzer. Higher relative velocity of the measurement resulted in the higher adhesion strength, and the effect of the new type of cellulose ether viscosity agent on the promotion of adhesion strength was prominent. The measured higher adhesion strength corresponded to the higher level of self-compacting performance of fresh concrete that was achieved by the new type of cellulose ether viscosity agent.

Free Research Field

コンクリート工学

Academic Significance and Societal Importance of the Research Achievements

社会インフラの大規模更新時代と国土強靭化推進のため，高い信頼性と経済性を両立させたコンクリートが必要である。そのためには，ペースト相に高い粘着力を付与することによってフレッシュコンクリートの自己充填性を維持しつつ，セメント量の低減と骨材量の増加を図る必要がある。本研究成果は、任意の材料および配合からそれを具体化する「最多骨材自己充填コンクリート」成立のために必要な、フレッシュコンクリート中のペーストまたはモルタル相の粘着力定量化のための技術となる。