Abstract: Dual-component polyurea dam protection materials were prepared by mixing different proportion isocyanate prepolymer component (a₁ and a₂) and aliphatic amine component (b) in accordance with the equivalent reaction mechanism. According to different performances, the polyurea was served as bottom layer and surface layer of the dam protection materials. Raw materials as well as their products were characterized by FTIR, their adhesiveness with concrete, anti-abrasion, anti-seepage, anticarbonation and environmental protection performance were also tested. The results showed that the products prepared by different formulas were polyureapolyaspartic ester. Its bottom layer had excellent adhesive property with concrete； whereas its surface layer had good water scour resistance； abrasion resistance； and excellent properties of anti-seepage, anti-carbonation. The material had little content of volatile organic compounds(VOC), which was safe and environmental friendly. The construction steps of polyurea dam protection materials contained foundation processing, bottom layer painting, surface layer painting, and maintenance etc. Polyurea-dam protection materials is easy to construct, and it has been successfully used in the spillway surface of Tangdu river reservoir for the purpose of project strengthening and danger eliminating.

Key words: polyurea ,  dam face protection ,  spillway face,    anti-erosion and antiabrasion ,  construction technology