Developments of methods for evaluating volume change of hardened cement paste based on physical properties of hydration product

2016 Fiscal Year Final Research Report

• Project/Area Number: 26820181
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Civil engineering materials/Construction/Construction management
• Research Institution: University of the Ryukyus (2016); National Institute of Technology, Toyota College (2014-2015)
• Principal Investigator: SUDA Yuya 琉球大学, 工学部, 助教 (10636195)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: C-S-H / Ca/Si比 / Al/Si比 / 屈曲度 / 比表面積 / フラクタル次元 / 体積変化 / 空隙径分布

Outline of Final Research Achievements

The purpose of this study is to develop a method to evaluate the volume change of hardened cement paste based on hydration products and pore structure. In the results, it is shown that the specific surface area of Calcium silicate hydrate(C-S-H), which was dominant hydration product of cementitious materials, was increased by the low Ca/Si ratio and high Al/Si ratio. In the high drying humidity, the tortuosity of hardened cement paste was affected by pore volume. On the other hand, in the low drying humidity, the tortuosity of hardened cement paste was affected by hydration products. Furthermore, it is experimentally confirmed that the change of mesoscale structure of hardened cement paste is dominant factor to drying shrinkage.

Free Research Field

セメント化学，コンクリート工学