Basic consideration for polyurethane waterproofing system

Part5　Kind of primer and reduction factor of blistering

Abstract

In general, concrete substrate is coated with urethane waterproof material after contained water has dried enough.Because troubles of blistering and peeling of urethane waterproof membrane are found here and there after urethane waterproof material has become hardened.On the other hand,take account of quality and durability of concrete substrate, completely dry of it is not necessarily appropriate.With all these factors, we continue the investigation of relation between the amount of contained water of concrete substrate and the blistering of urethane waterproof membrane.In our previous report,we demonstrated that frequency of blistering is derived from thickness of the coating and drying time of primers.In this report, we describe the experimental result of primers to promote curing and consider the factor of reducing means of blistering of urethane waterproof membrane.