聚天冬氨酸酯聚脲涂层混凝土的附着性及氯离子扩散性研究

采用氯盐自然浸泡及机械静荷载-氯盐浸泡协同作用实验方法,研究交联结构聚天冬氨酸酯(PAE)聚脲涂层混凝土的附着性及氯离子扩散性,探讨氯盐自然浸泡、机械静荷载-氯盐浸泡协同作用下PAE聚脲涂层对混凝土附着性的影响因素,建立氯离子扩散模型。结果表明,在10%NaCl溶液中自然浸泡300d后,T3(PAE-t-HDI prepolymer-D2000H65)和TM(T3面漆/MDI乳液底漆)涂层对混凝土的附着力仅分别降低3%和1.9%,涂层混凝土体系的氯离子扩散系数为10-13～10-14 m2/s数量级;机械静荷载-氯盐自然浸泡协同作用300d后,T3涂层混凝土附着力比单纯自然浸泡作用降低了约14%,TM涂层混凝土附着力始终保持在2.5N/mm左右,T3和TM涂层混凝土体系的氯离子扩散系数保持在10-13～10-14 m2/s。

Study on Adhesion and Resistance of Chloride Diffusion of Polyaspartic Polyurea Coated Concrete

The NaCl immersion exposure and the coaction of load-NaCl solution immersion double factors exposure were employed to analysis the wet adhesive property and resistance of chlorion diffusivity of polyaspartic ester(PAE) polyurea coated concrete.The investigations on the influence of 10% NaCl immersion exposure to the T3(PAE-t-HDI prepolymer-D2000H65)coated concrete and TM(T3 finishing coat/ MDI emulsion primer)coated concrete reported that after 90～300 days exposure,the coated specimens show favourable wet-adhesion,and resistance of chlorion diffusivity.Comparing with single NaCl solution immersion exposure,the coaction of load-NaCl solution immersion double factors have more influence to the properties of the coated concrete.Under the coaction of these double factors,the diffusion coefficient of Chloride ion of T3 and TM coated concrete are 10-13～10-14 m2/s,adhesion of TM is about 2.5 N/mm,indicating favourable anti-corrosion characteristics.