The aging properties of the protective material are of great importance to ensure the safe operation of the concrete structure during its service life. In this study, the aging properties of a viscoelastic protective coating were investigated. The mechanical properties of the coating under outdoor exposure and high-low temperature cycles were determined. Fourier Transform Infrared Spectroscopy (FTIR) was used to observe the change of chemical structure after aging test. The results show that the tensile strength, the elongation at break and the tear strength decrease by 2.33%, 26.58% and 1.63% respectively after 150 days of natural exposure. The tensile strength, the elongation at break and the tear strength decrease by 32.49%, 39.11% und 30.44% respectively after 100 times of high-low temperature cycles. The natural exposure affects the elongation at break of the coating most, while the high-low temperature cycles have a significant effect on the tensile strength, the elongation at break and the tear strength. FTIR analysis shows that the chemical bonds on the surface of the material are degraded because of natural exposure.

One of the most important factors for the application of coatings on infrastructure is their interfacial performance. The paper presents an experimental study on the influence of adverse environmental circumstances in the interfacial performance of a coated mortar. For the purpose, a damping and protective material was applied a mortar substrate and the saturated Ca(OH) 2 solution, the salt-spray and the static bending load were independently and collectively applied on the coated mortar specimens. The adhesion strength and the interfacial micro-deformation of the coating are determined. SEM and FTIR were employed to characterize the interfacial morphology and analyze the cohesive mechanism between the coating and the mortar.Test results lead to the conclusion that the adhesion strength of the coating is not significantly influenced by the corrosive environment. The adhesion strengths of specimens are above 1MPa under 20d of the immersion of saturated Ca(OH) 2 solution, the co-action of bending load and saturated Ca(OH) 2 solution and the co-action of bending load and salt-spray, respectively. Meanwhile, the interfacial strain of the coating-substrate varies according to different experimental circumstances and it was affected most by the coaction of bending load and saturated Ca(OH) 2 solution. Under the coaction of bending load and saturated Ca(OH) 2 solution, the ultimate interfacial strain in the center decreases by at least 11 compared to controlled specimens, while the ultimate interfacial strain decreases by at least 7 under the co-action of bending load and salt-spray.