RESEARCH ON CARBONATION SUPPRESSIVE EFFECT OF COATING MATERIALS FOR TEXTURED FINISHES AND AIR PERMEABILITY COEFFICIENT BASED ON THE RESULT OF A SURVEY OF AN EXISTING STRUCTURE

Core samples were taken from a structure several decades old, with coating materials for textured finishes, to make an accelerated carbonation test. Referring to the test result, the carbonation suppressive effect of the aged coating materials for textured finishes was evaluated on the basis of the diffusion theory. In addition, the evaluation result was compared with the prediction of carbonation progress determined from the air permeability coefficient measured at the time of the test. This comparison was intended to validate the reliability of the assessment of the carbonation suppressive effect of the coating materials for textured finishes on the aged structure, using the air permeability coefficient. This study demonstrated that the carbonation depth estimated from the air permeability coefficient, with consideration given to the aging of the coating materials for textured finishes, agreed well with the carbonation depth measured in the accelerated carbonation test.