【摘要】 采用二苯酮-4对LDHs进行有机插层改性,研究二苯酮-4有机插层改性LDHs(BI-LDHs)对沥青混合料抗老化性能的影响.拟定质量分数为3%和5%两个BI-LDHs掺量,分别采用沥青混合料加速老化试验和室内紫外老化模拟试验对AC-13和AC-20两种沥青混合料进行短期热氧老化和紫外老化,采用控制应变的疲劳试验,对老化前后沥青混合料的疲劳寿命和疲劳极限进行研究.结果表明,老化前,BI-LDHs使得沥青混合料疲劳寿命有所降低;老化后沥青混合料的疲劳寿命均减小,但老化后BI-LDHs改性沥青混合料的疲劳寿命反而大于未添加改性剂沥青混合料,表明BILDHs能够延缓老化过程,显著提高沥青混合料的抗老化性能.更多还原

【Abstract】 The benzophenone-4 was adopted to the organic-intercalated modification of LDHs to investigate the effect of the BI-LDHs on the anti-aging properties of the asphalt mixture.Two dosages of BILDHs(3% and 5%)were set up,and the accelerated aging test and indoor ultraviolet aging tests were conducted to simulate the short-term thermo-oxiditive aging and ultraviolet aging of two kinds of asphalt mixtures(AC-13 and AC-20)respectively.Then the control strain fatigue test was used to test the fatigue life and fatigue limit of asphalt mixture before and after aging.The results show that,before aging,the fatigue life of asphalt mixtures decrease with the addition of BI-LDHs;after aging,the fatigue life of all asphalt mixtures dereases,but the fatigue life of BI-LDHs modified asphalt mixtures is higher than that of asphalt mixtures without BI-LDHs,which indicates that BI-LDHs can delay the aging process and enhances the anti-aging performance of asphalt mixtures obviously.更多还原