环氧沥青混凝土复合铺装结构疲劳试验研究

Research on the Fatigue Property of Multilayered Pavement on Concrete Bridge Deck

水泥混凝土桥面铺装整体结构的疲劳特性是决定铺装层使用寿命的关键.通过对双层沥青铺装层结构的复合梁以及"水泥混凝土板+双层沥青混合料铺装"三层复合结构的疲劳试验,对水泥混凝土桥面铺装层复合结构的疲劳性能进行了研究,同时考虑了层间防水粘结层的影响.结果表明当微应变为700×10-6时,"环氧沥青混凝土+SMA"结构的疲劳寿命是其他类型铺装结构的1.4倍;"水泥混凝土板+环氧沥青混凝土+SMA"三层复合结构的疲劳寿命是其他类型铺装结构的2.1倍.结论表明"环氧沥青+SMA"复合铺装结构适宜于水泥混凝土桥面铺装.

It is key for life-span of deck pavement that if the fatigue property of the whole deck pavement structure is better or not.The facts showed that when some materials with good fatigue properties were adopted,but the life of deck pavement was not prolonged at all.Here some experiments on double-layered asphalt deck pavement and ＂concrete deck＋double-layered asphalt deck pavement＂ were done,along with some researches on the fatigue property of multi-layered deck pavement,considering the influence of adhesion layer.Some conclusions have been arrived that when the micro strain equals to 700×10-6,the fatigue life of the beam combined with epoxy asphalt concrete and SMA is 1.4 times than other deck pavement structures;the fatigue life of the triple-layered deck pavement combined with concrete deck,epoxy asphalt concrete and SMA is 2.1 times than other type of deck pavement.That indicates that deck pavement combined with epoxy asphalt concrete and SMA is suitable for concrete bridges.