Studies on synthesis and properties of novel polyurethane pavement joint sealant modified with polydimethysiloxane

The development of a general use pavement joint sealant is described in this paper. A novel two-component polyurethane (PU) modified with hydroxyl terminated polydimethysiloxane joint sealant was developed for the needs of inland Chinese cement concrete pavement joint sealant production and applications. The performances of these sealants after hot pressing and hard drawing were also investigated. The cohesional strength of this new joint sealant material maintained 93·20% after hot pressing and hard drawing and was much higher than conventional PU and tar based PU joint sealants. This new sealant has superior tensile strength, cohesional strength, fatigue and aging resistance compared with currently used sealants.