Size Effect on Fracture Energy Test in Concrete

2016 Fiscal Year Final Research Report

• Project/Area Number: 25820195
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Civil engineering materials/Construction/Construction management
• Research Institution: Tokyo Metropolitan University
• Principal Investigator: OHNO Kentaro 首都大学東京, 都市環境科学研究科, 助教 (80571918)
• Project Period (FY): 2013-04-01 – 2017-03-31
• Keywords: コンクリート / 破壊エネルギー / 寸法依存性 / アコースティック・エミッション法 / 骨材最大寸法 / 切欠き高さ / 破壊進行領域

Outline of Final Research Achievements

In this study, size effect on fracture energy test in concrete are investigated based on acoustic emission monitoring during fracture energy test. The experimental results show the fracture energy increases with increase in the maximum size of aggregate and heights of specimens. It is confirmed that the fracture energy correlates with the width of AE cluster, as the energy increase when the width of fracture process zone expands. In addition, focusing on the energy by the applied load during loading history, it is demonstrated that energy before maximum load shows constant, regardless of specimen height and the maximum size of aggregate. On the other hand, energy between maximum load and 20% decrease from maximum load gradually decreases as decrease specimen height. Furthermore, heights of fracture process zone before maximum load are not change by specimen height. Therefore, size effect on fracture energy test in concrete is caused after the applied load reaches maximum load.

Free Research Field

コンクリート工学