【摘要】 针对目前钢桥面铺装面层沥青混合料容易产生疲劳开裂的问题,根据沥青混合料粘弹原理中的累积耗散能和滞后环线理论,提出通过降低沥青混合料每次滞后环线的损失能量从而提高沥青混合料疲劳寿命的观点。根据此原理开发了高弹改性沥青,对高弹改性沥青的高低温性能以及疲劳性能进行了试验验证,高弹改性沥青混合料的低温变形能力有很大的提高,-10℃低温大梁弯拉应变大于10 000μ,ε4点弯曲小梁疲劳寿命比普通改性沥青混合料的疲劳寿命有了很大的提高,1 000με的疲劳寿命达到190万次,是普通混合料的疲劳寿命的20倍左右。更多还原

【Abstract】 To cope with the fatigue cracking occurred to the asphalt mixture on steel deck pavement,it was put forward that the fatigue life of asphalt mixture can be improved by reducing the failure energy of each hysteresis loop of asphalt mixture according to the cumulative dissipated energy and hysteresis loop theory in the principle of viscoelasticity for asphalt mixture.Based on this principle,a kind of modified asphalt with high elasticity was developed,and its high and low temperature performances and fatigue performances were also tested.The result shows that(1) low temperature deformability of the high-elastic modified asphalt mixture has remarkably improved and low temperature bending strain of girder at-10 ℃ is above 10 000 με;(2) the fatigue life of modified asphalt mixture with high elasticity has greatly improved by 4-point bending beam test compared with common modified asphalt mixture.The fatigue life at 1 000 μεdeformability is about 1.9 million times which is about 20 times longer than that of ordinary asphalt mixture.更多还原