STUDY ON RELATIONSHIP BETWEEN OCCURRENCE GRADE OF MICROCRACK DUE TO DRYING SHRINKAGE AND RESULT OF AIR PERMEABILITY TEST

Abstract

 The result of air permeability test devised by R. Torrent is supposed to be affected by moisture content in surface layer of concrete. In this study, air permeability test, crack observation, and measurement of surface humidity were carried out under various humidity condition and drying shrinkage stress analysis were carried out. And the following knowledge have been obtained : moisture content in a surface layer of concrete influences the air permeability of concrete, occurrence grade of microcrack in concrete depending on the behavior of moisture content is related to air permeability of concrete, when density of microcrack becomes than a constant value, a change occurs in the relationship and so on.