2009 Volume 63 Issue 1 Pages 189-195
The in-situ air permeability test method has been proposed by authors. The method can obtain an air permeability coefficient from measurement of air flow rate at a concrete structure. The proposed test methods are called the seal method and the seal intrusive method. On the seal method, air is exhausted from the center of circular airtight treatment on concrete surface. On the seal intrusive method, further a hole is made in center of circular airtight treatment and air is exhausted from the hole. In this study, the seal material that maintains airtight at the measurement and peels off easily from surface of concrete after the measurement was investigated. Polyvinyl acetate is suitable for the seal material from the viewpoint of the keeping of airtight at the measurement and easiness of seal material to remove after the measurement. Furthermore, the exhausted method for the seal intrusive method was improved to measure the supposed air flow rate. The proper air flow rate is obtained by inserting the pipe in the center of the hole and exhausting it in the seal intrusive method. The seal intrusive method has the possibility of evaluating the distribution of the air permeability coefficient in concrete by the measurement that gradually makes the hole deeper.
