| Project/Area Number |
06650500
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
土木材料・力学一般
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| Research Institution | Hachinohe Institute of Technology |
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Principal Investigator |
SHOYA Masami Hachinohe Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (80006684)
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| Co-Investigator(Kenkyū-buntansha) |
TSUKINAGA Yoichi Hachinohe Institute of Technology, Faculty of Engineering, Associate Professor, 工学部, 助教授 (60124898)
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| Project Period (FY) |
1994 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1995: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1994: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | Combined action / Freezing and thawing action / Chloride penetration / Carbonation / Air content / Watar cement ratio |
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| Research Abstract |
(1) Combined action of freeze-thaw and chloride penetration
(1)Chlorides existing in the mortar moved toward inner parts and partially concentrated due to freeze-thaw action and the tendencies were pronounced when a freezing temperature was lower and freeze-thaw cycles increased.
(2) The effects of chlorides were serious on the scaling damage and the degree of damages were different in different chloride type, curing condition, water cement ratio and air content.
(2) Combined action of freeze-thaw and carbonation
(1) Carbonation after freeze-thaw action was accelerated and the degree of carbonation was different in different air content.
(2) Weight change due to freeze-thaw action after carbonation increased a little, however, the change of relative dynamic modulus of elasticity was not pronounced.
(3) Combined action of freeze-thaw, chroride penetration and carbonation
(1) Freeze-thaw action in the presence of chloride affected the rate of carbonation.
(2) Scaling damage due to freeze-thaw action in the presence of chloride after carbonation increased, then the mechanism of deterioration was complicated and must be clear in the future.
(3) It will be possible to make a synthetic diagnosis of damaged concrete due to combined action of freeze-thaw, chloride penetration and carbonation, through the analyzes concerning the pull-off strength, rebound number or pulse velocity from a side view of strength, and recovering speed or coefficient of water absorption in the rapid test from a side view of tightness.
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