Study on characteristics change and its mechanism of cementitious materials exposed to 60-80 degrees C

2015 Fiscal Year Final Research Report

• Project/Area Number: 25289130
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Civil engineering materials/Construction/Construction management
• Research Institution: Saitama University
• Principal Investigator: ASAMOTO Shingo 埼玉大学, 理工学研究科, 准教授 (50436333)
• Co-Investigator(Kenkyū-buntansha): KURAHIGE Isao 電力中央研究所, 地球工学研究所, 主任研究員 (20371461) ; NAWA Toyoharu 北海道大学, 大学院工学研究院, 教授 (30292056)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: セメント硬化体 / 高温負荷 / 物性変化 / 遅延エトリンガイト生成 / フライアッシュ

Outline of Final Research Achievements

In this study, mechanical properties such as compressive strength and chemical degradation of cementitious materials exposed to 60-80 °C was examined. As a result, history of 80 °C during the curing can retard the strength development comparing to 20 °C curing case based on the pore structure change. It was also found that the cement with limestone powder is more probable to cause a map cracking on the surface of cementitious materials when they are exposed to high temperature at early ages. It is suggested that the replacement of cement with fly ash can be effective to inhibit the chemical degradation and to avoid the large strength reduction depending on the aggregate type.

Free Research Field

コンクリート工学