Enhancement of structural performance of mass concrete members by internal curing with porous ceramic-roof tile waste aggregates

2015 Fiscal Year Final Research Report

• Project/Area Number: 25630187
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Civil engineering materials/Construction/Construction management
• Research Institution: Hiroshima University
• Principal Investigator: Sato Ryoichi 広島大学, 工学(系)研究科(研究院), 名誉教授 (20016702)
• Co-Investigator(Kenkyū-buntansha): KAWAI KENJI 広島大学, 大学院工学研究院, 教授 (90224716) ; OGAWA YUKO 広島大学, 大学院工学研究院, 助教 (30624564)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 廃瓦骨材 / 内部養生 / 高炉セメントB種 / マスコンクリート / 構造性能

Outline of Final Research Achievements

Internal curing effects with porous ceramic-roof tile waste aggregates (PCA)were investigated on mechanical properties of concrete as well as RC beams made of portland blast furnace slag cement type B, subjected to high temperature history at early age.
The results showed that (1)Compressive strength of concrete which decreased by 15% due to high temperature effect increased by 10% due to the internal curing, (2)Autogenous shrinkage and its resultant reinforcement strain increased significantly in temperature rise stage and decreased remarkably in temperature drop stage, which thereafter, increased again under room temperature, (3)Maximum crack width of RC beams was not affected by the internal curing and the high temperature history, (4)Shear strength of RC beams without PCA decreased by 5% due to the high temperature effect, which increased markedly with fine PCA resulting in being larger than that without PCA under room temperature.

Free Research Field

コンクリート工学