Durability mechanics of concrete structure based on nano-atomic scale alteration of C-S-H

2017 Fiscal Year Final Research Report

• Project/Area Number: 15H04077
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Building structures/Materials
• Research Institution: Nagoya University
• Principal Investigator: Maruyama Ippei 名古屋大学, 環境学研究科, 教授 (40363030)
• Co-Investigator(Kenkyū-buntansha): 寺本 篤史 広島大学, 工学研究科, 助教 (30735254) ; 五十嵐 豪 東北大学, 工学研究科, 助教 (10733107)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: コンクリート / 乾燥 / 剛性 / 収縮ひび割れ / C-S-Hの変質

Outline of Final Research Achievements

Structural performance of reinforced concrete member is dramatically changed due to drying. Concrete compressive strength, tensile strength, and Young's modulus are changed due to drying, and those material performance changes as well as shrinkage-induced cracks alter the structural performance of reinforced concrete member. To understand, predict, and control this phenomena, the understanding of nano-structural changes in hardened cement paste is crucial, and we found the dynamic microstructure change of hardened cement paste through small angle X-ray scattering and water vapor sorption isotherm. Concrete properties change is governed by inhomogeneous volume change between aggregate and cement paste and in this behavior, the interfacial transition zone has a significant role. The reinforced concrete walls with/without drying were investigated and it was found that drying has large influences on stiffness and deformation at the strength.

Free Research Field

建築材料学