Effect of three-component polyurethane adhesive on the interlaminar bonding performance of poro-elastic road surface

Abstract

Poro-elastic road surface(PERS) is a mixture composed of polymer adhesive (usually polyurethane adhesive), mineral aggregate, rubber granules, etc. The voids of PERS mixture are more than 20%. It has the characteristics of porosity and elasticity, and is an excellent low-noise pavement mixture. The single-component polyurethane is usually used as the bonding materials between PERS and the lower pavement layer. Generally, it needs to be cured for more than 3 days. It makes the construction more difficult because the curing time is too long. A new three-component polyurethane adhesive was developed to shorten the curing time. The cylinder specimens were prepared combined with PERS-10 and SMA-13. The differences of interlaminar bonding strength between single-component polyurethane and three-component polyurethane were compared under different curing time. The relationship between the dosage of three-component polyurethane and the interlaminar bonding strength was analyzed, and the optimal dosage was proposed. The research results show that the interlaminar bonding strength of single-component polyurethane adhesive tends to be stable only after 72 hours of curing time, but that of three-component polyurethane adhesive tends to be stable soon after 6 hours. The dosage of three-component polyurethane adhesive has a significant influence on the interlaminar bonding strength, and the optimal dosage range of this adhesive is proposed to be 0.6kg/m2~1.0kg/m2. The three-component polyurethane adhesive greatly shortens the curing time after the construction of PERS mixture, and increases the interlaminar bonding strength more than 20%.