新型混凝土桥面铺装材料的冲击力学性能

Experimental study on impact behaviors of a new kind of pavement material for concrete bridge deck

利用大尺寸Hopkinson压杆对新型混凝土桥面铺装材料——钢纤维增强聚合物改性混凝土(steel fiber reinforced and polymer modified concrete,SFRPMC)进行了冲击实验,并且在相同基准配合比下,与普通混凝土、钢纤维混凝土的冲击性能进行了对比。观察了不同打击速度下三种材料的破坏形态,得到了在不同应变率下的应力应变关系,比较了三种材料的应变率敏感性,最后从机理上分析了掺加钢纤维和聚合物对混凝土材料冲击力学性能的影响。结果表明,钢纤维增强聚合物改性混凝土材料具有良好的冲击韧性,是一种理想的混凝土桥面铺装材料。

Impact tests of a new kind of pavement material for concrete bridge deck, steel fiber reinforced and polymer modified concrete （SFRPMC）, were carried out by using a large cross-section SHPB system. The impact behaviors of the new material were compared with those of plain concrete and steel fiber reinforced concrete under the same basic mixture ratio. After tests, the destructive behaviors of the three materials were observed and their stress and strain relations at different strain rates were measured. The sensitivities of strain rate of three materials were compared. The mechanism of influences of steel fiber and polymer additions on the dynamic mechanical behavior of concrete was analyzed. Results show that SFRPMC has good impact properties, and it is one of the ideal pavement materials.