The purpose of this study is to propose quality criteria for indoor acceleration weathering resistance of waterproofing materials, to improve quality level of urethane waterproofing material which is the most widely used in domestic sites, through relation analysis of the short term heat degradation weathering resistance of domestic or foreign urethane waterproofing materials, weathering resistance depending on extender filler content, and indoor acceleration degradation and 5 year outdoor exposure of 6 products from 5 companies which acquired KS quality certification, and the result can be summarized as follows:
Tensile strength depending on the extender filler content was the highest at the 20 % extender filler content and it was almost maintained at 35 %, but gradually decreased after 50 %, and elongation at the room temperature was almost same but, at 60 ℃, it decreased abruptly at the 65 % extender filler content. The dependence on heat treatment period was such that tensile strength and elongation drastically decreased until 28 days of heat treatment and, after 28 days, the decreasing rate itself showed decreasing trend. The fatigue resistance experiment depending on the extender filler content shows that after heat aging fatigue-resistance is worsened at higher than 50% extender filler content.
Comparison of short term heat degradation in domestic products and Japanese products shows that Japanese products were relatively better in tensile strength and elongation, and the reason is considered to be that domestic products are produced based on the 1 week heat degradation standard.
After outdoor exposure in 0.5, 1, 3, and 5 years, the appearance change, tensile strength, fatigue-resistance of the exposed type poly urethane waterproofing material, and the cracking part rupture-resistance and degradation in the expanded and delicate waterproofing material were analyzed microscopically, and the result showed that from after 1 year fine cracks were observed on the surface and tensile strength decreased gradually by the amount of 30 % after 3 years, 39 % after 5 years, and elongation increased until 6 months by 11% and then gradually decreased by 7 % from the initial value after 3 years, and by 8 % after 5 years. In the case of test specimens that extended the film spread over the CRC board to 2.5mm, rupture happened to 4 specimens after 3 years and 5 specimens after 5 years. The 5 year exposure test site had the following weather conditions: average temperature of 11.8 ℃, average relative humidity of 67.3 %, white panel average temperature of 11.9 ℃, 305∼2 800 nm wavelength band total insolation of 26 349 MJ/㎡, and 315∼400 nm wavelength band ultra-violet insolation of 1 336 MJ/㎡.
Performance degradation of the domestic 6 urethane waterproofing materials due to outdoor exposure treatment and performance degradation due to indoor acceleration exposure treatment were compared and analyzed, and the result showed that tensile strength clearly decreased after heat treatment and Xenon arc acceleration exposure, and after 3 years, 4 years, and 5 years of outdoor exposure, tensile strength was verified to decrease by 30 %, 35 %, and 39 %, respectively. And, the corresponding heat treatment period at the indoor temperature of 80℃ was analyzed to be 54, 68, 78 days, respectively, and the corresponding Xenon arc acceleration degradation hours was analyzed to be 1 287, 1 600, 1 817 hours, respectively. Therefore, it will be preferable to determine the tensile strength quality standard as higher than 70 % after 54 days of heat treatment or 1 287 hours of Xenon arc acceleration exposure, which is corresponding to 3 years of outdoor exposure, and to increase the standard to 80 % after 6 month guidance period for quality increase to induce additional quality increase.