PERMIT-Ion Migration Test

PERMIT can be used to assess the resistance of building materials to the transport of ionic species, such as chlorides, sulphates, etc., which are considered detrimental to the long-term performance of construction materials. The current procedure to determine this property of a building material is to test, in the laboratory, cores removed from structures. The test itself may last for three to seven days, depending on the quality of the material. The PERMIT requires only a test duration of less than 10 hours and is the only instrument available at present to measure on site the resistance of building materials to ionic transport.