Multiscale Modeling of Cementitious Materials and Structures based on Properties of Calcium Silicate Hydrates

2020 Fiscal Year Final Research Report

• Project/Area Number: 17H01284
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Civil engineering materials/Construction/Construction management
• Research Institution: The University of Tokyo
• Principal Investigator: Ishida Tetsuya 東京大学, 大学院工学系研究科(工学部), 教授 (60312972)
• Co-Investigator(Kenkyū-buntansha): 高橋 佑弥 東京大学, 大学院工学系研究科(工学部), 講師 (10726805) ; 浅本 晋吾 埼玉大学, 理工学研究科, 准教授 (50436333)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Keywords: コンクリート / カルシウムシリケート水和物

Outline of Final Research Achievements

The objective of this study was to construct a multiscale thermodynamic model and a time-dependent constitutive law that take into account the properties of calcium silicate hydrates, whose characters are different depending on the type of binder, and to develop a numerical analysis scheme to directly evaluate both the microscopic properties of cementitious materials and the macroscopic behavior of structures. A model describing the hydration reaction of fly ash with various physico-chemical compositions was developed in a unified framework, and a generalized model including both artificial pozzolans and natural pozzolans was successfully constructed. In addition, we focused on the connectivity of pore structures and attempted to elucidate the mechanism of water and ion transport in microstructures, and found that the threshold value of water content that ensures pore connectivity can be uniquely determined regardless of the porosity.

Free Research Field

工学

Academic Significance and Societal Importance of the Research Achievements

本研究は、ポゾランのガラス組成や物理化学特性に着目し、反応プロセスの一般化モデルを構築して、その空隙構造特性や長期耐久性に関わる物質移動特性を明らかにした。フライアッシュといった産業副産物、火山灰、焼成粘土、メタカオリンに代表される人工ポゾランの積極活用など、世界各国固有の文脈で出現している様々な次世代型建設材料を統一的に扱う研究の方法論は、高い工学的有用性を有するとともに、当該分野の知の体系化に資する他を大きくリードする研究と言える。