Estimation of the risk of defective concrete filling and the expansion

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K18191
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Building structures/Materials
• Research Institution: The University of Kitakyushu
• Principal Investigator: Suyama Hiroki 北九州市立大学, 国際環境工学部, 准教授 (20507876)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: コンクリート工事 / 充填不良 / ジャンカ / モルタル逸失モデル

Outline of Final Research Achievements

As a model for defective filling, I propose a mortar loss model in which the mortar component of concrete falling freely down into a frame is considered to adhere to rebar inside the frame. Concrete arriving at the bottom of the frame thus contains an excess amount of coarse aggregate, a situation considered prone to defective filling. Under the mortar loss model, I clarified the effect of concrete mix proportion, concrete flow quantity and rebar arrangement on the amount the mortar loss through the experiments. I considered the vibrational energy to eliminate the risk of defective filling on the concrete containing an excess amount of coarse aggregate. Finally, I apply my measurements to a wall construction case study and, within it, estimate the risk of defective concrete filling.

Free Research Field

建築材料・施工