Challenge to reduce drying shrinkage of concrete aggregate focused on clay minerals in rock

2016 Fiscal Year Final Research Report

• Project/Area Number: 15K14061
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Building structures/Materials
• Research Institution: Tohoku University
• Principal Investigator: Igarashi Go 東北大学, 工学研究科, 助教 (10733107)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Keywords: コンクリート / 岩石 / 体積変化 / ひび割れ / 粘土鉱物 / 親水性 / 水蒸気吸着 / 拡張BET理論

Outline of Final Research Achievements

It should be recommended to evaluate whether a rock is better suited for as a concrete aggregate from the view point of petrography in order to calculate/ control the volume shrinkage and expansion of concrete and the cracks due to the volume changes. In this study, it is focused on that calculate/ control of volume change of concrete mainly based on the mechanism of drying shrinkage due to the shrinkage/ swelling of layered structure of clay minerals in rocks. As a result, it is suggested that there are three kind of hydrophile adsorbed sites in tobermorite analyzed with modified BET theory.

Free Research Field

コンクリート工学