二次回归正交设计的高粘度改性沥青性能

Properties of high-viscosity modified asphalt based on quadratic regression orthogonal design

为了优化高粘度改性沥青的制备工艺,借助二次回归正交设计,对苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)及添加剂A、B的掺兑量与改性沥青60℃和135℃粘度之间关联规律进行了研究.结果表明:SBS和添加剂B可大大增加改性沥青60℃的粘度,而添加剂A能有效的控制改性沥青135℃的粘度.建立了改性剂掺兑量与改性沥青60℃和135℃粘度的数学模型并进行了方程拟合,回归方程的拟合度分别为11.007、75.853,均大于F0.01(9,8)=3.39,表明在α=0.01水平上回归方程具有较好的拟合度,对高粘度改性沥青的制备具有指导作用.

To optimize the preparation technology of high-viscosity modified asphalt, quadratic regression orthogonal design was applied to investigate the relation between content of modifiers （modifier styrene-butadiene-styrene block copolymer （SBS）, additive A and B） and viscosities of modified asphalt at 60 and 135 ℃. The results show that the viscosity of modified asphalt at 60 ℃ is markedly increased by SBS and additive B, while the viscosity at 135 ℃ can be effectively controlled by additive A. Mathematical models on the content of modifiers and the viscosities of modified asphalt at 60 and 135 ℃ were obtained and the regression equations were fitted. The fitting degrees are 11. 007 and 75. 853 respectively, and they are both larger than F0.01 （9,8）, the value of which is 3. 39. It indicates that the regression equations have high fitting degrees at α=0.01 and play a guiding role for the preparation technology of high-viscosity modified asphalt.