1996 Fiscal Year Final Research Report Summary
Study on the Composition of the ALC External Walls and the Establishment of the Regional Work Specification in Cold District.
| Project/Area Number |
07650651
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Building structures/materials
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| Research Institution | HOKKAIDO UNIVERSITY |
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Principal Investigator |
HASEGAWA Toshio Hokkaido University Faculty of Engineering, Research Associate, 工学部, 助手 (60002036)
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| Project Period (FY) |
1995 – 1996
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| Keywords | autoclaved light-weightconcrete / composition of wall / frost damage / varor condensation / water vapor transfer |
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| Research Abstract |
We set up seventeen types of ALC external walls in three conditions of outdoor temperature (0, -10,1-20ﾟC : constant) and three conditions of indoor air humidity (40,60,80% R.H.in 20ﾟC) for thirty days, and measured the quantity of vapor flowed into ALC external walls from indoor and the quantity of internal condensation of ALC external walls.
As the outdoor temperature lowered and the indoor air humidity is higher, the quantity of flowing vapor and internal condensation increased. On this point, a simple ALC walls (50mm thickness) is typical. As the outdoor temperature lowered, most of flowing vapor into wall accumulated inside wall.
We wish this study enable us to select a suitable construction method of the external wall in cold district. We set up several ALC external walls in several conditions of outdoor temperature and indoor humidity, and measured the quantity of vapor flowed into the walls from indoor and the quantity of internal vapor condensation of the walls.
As a result, when the outdoor temperature changed with one day period, the lower the maximum outdoor temperature, the more the quantity of the internal vapor condensation. And we knew the vapor flowed into the wall had a tendency to concentrate in the freezing area of the wall in case of the change of the outdoor temperature.
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