1993 Fiscal Year Final Research Report Summary
DETECTION OF FRACTURE PROCESS ZONE IN CONCRETE BY X-RAY WITH CONTRAST MEDIUM
| Project/Area Number |
04650426
|
|---|
| Research Category |
Grant-in-Aid for General Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
コンクリート工学・土木材料・施工
|
|---|
| Research Institution | TOHOKU GAKUIN UNIVERSITY |
|---|
Principal Investigator |
OTSUKA Koji TOHOKU GAKUIN UNIVERSITY Faculty of Engineering, Department of Civil Engineering, Professor, 工学部, 教授 (10048803)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
GOTO Yukimasa TOHOKU GAKUIN UNIVERSITY Faculty of Engineering, Department of Civil Engineering, 工学部, 教授 (50005154)
|
|---|
| Project Period (FY) |
1992 – 1993
|
| Keywords | Fracture process zone / X-ray technique with contrast medium / Fine cracks in concrete / Aggregate size effect / Fracture energy / Compact tension test specimen |
|---|
| Research Abstract |
Experiments were carried out to detect fracture process zone in concrete by a new nondestructive x-ray inspection technique for concrete using a contrast medium. As results of experiments, the following conclusions can be drawn :
(1)the x-ray inspection technique developed in this study is an effective mean of nondestructively detecting the fracture process zone in concrete.
(2)Using one size of CT specimen (Compact tension specimen) and 4 different maximum sizes of of aggregates, effects of aggregate size in fracture process zone were investigated. It could be observed that the size of the fracture process zone is strongly related to the maximum aggregate size. The maximum width of zone of fine cracks' is greater when the maximum aggregate size is larger.
(3)The fracture energy GF increases as the maximum aggregate sizes become larger. The fracture energy WF that is calculated from the volume of fracture process zone is almost constant independent of the maximum aggregate size.
|
