彩色沥青混合料紫外线老化影响因素的灰色关联分析

使用基质沥青制备空隙率分别为20%,23%,25%的大空隙母体马歇尔试件,并在母体表面涂上不同二氧化钛掺量改性的彩色乳化沥青.将颜色、空隙率、二氧化钛掺量和紫外线照射时间作为影响因素,将紫外线照射后试件的马歇尔稳定度作为评价指标,采用灰色关联分析理论,对彩色沥青混合料紫外线老化的影响因素进行研究.结果表明:空隙率越大,紫外线对彩色沥青混合料的老化影响越明显;二氧化钛能提高彩色沥青混合料抗紫外线老化性能,当二氧化钛掺量为3.0%时,彩色沥青混合料的抗紫外线老化性能最佳;4种影响因素按照重要程度排序为紫外线照射时间>二氧化钛掺量>空隙率>颜色,且灰色关联度均大于0.600,表明这4种因素均对彩色沥青混合料的抗紫外线老化性能有重要影响.

Grey Correlation Analysis of Factors Affecting Ultraviolet Aging of Colored Asphalt Mixture

Matrix asphalt was used to prepare large void matrix Marshall test pieces with void ratios of 20%, 23% and 25%. The surface of the matrix was coated with different TiO₂ content modified colored emulsified asphalt. Color, void ratio, TiO₂ content and ultraviolet irradiation time were taken as the influence factors, Marshall stability of test piece after ultraviolet irradiation was used as the evaluation index, and the grey correlation analysis theory was introduced to study the influence factors of ultraviolet aging of colored asphalt mixture. The results show that the higher the void ratio, the more obvious the aging effect of ultraviolet on colored asphalt mixture. TiO₂ can improve the ultraviolet aging resistance of colored asphalt mixture, when TiO₂ content is 3.0%, the colored asphalt mixture has the best anti-ultraviolet aging property. The four influence factors were ranked according to their importance: ultraviolet irradiation time > TiO₂ content > void ratio > color, and the gray correlation degree was greater than 0.600, indicating that these four factors have an important influence on the anti-ultraviolet aging properties of the colored asphalt mixture.