水泥混凝土桥面铺装层间界面剪切性能试验研究  

Experimental Study on Layers’ Interface Shear Performance of Cement Concrete Bridge Deck Pavement

作　　者：王伟[1] 孟庆营[1] 周卫峰[1] 张红兵[1] 张娟[2] 

机构地区：[1]天津市市政工程研究院,天津300074 [2]长安大学特殊地区道路教育部重点实验室,陕西西安710064

出　　处：《中国市政工程》2013年第1期87-91,111,共5页China Municipal Engineering

摘　　要：为减少推移、拥包、铺装层脱落等桥面铺装剪切破坏,建立了足尺力学实体模型,利用有限元软件ANSYS分析了桥面铺装体系内的剪应力分布状况,然后针对层间界面这一薄弱环节,利用直剪试验对层间界面剪切性能进行了深入研究。试验结果表明:双SMA倒装结构(上面层SMA-16/下面层SMA-13)在层间抗剪强度上具有较为明显的优势;溶剂型黏结剂与SBS改性沥青和水性沥青基涂料相比,具有较好的抗剪性能;在浸水和冻融试验条件下,3种界面的抗剪强度存在显著差异,刷毛>凿点>刻槽;试验条件对层间界面的抗剪强度有十分重要的影响:抗剪强度干燥状态时>冻融状态时>浸水状态时;在不施加正压力的情况下,下界面层间抗剪强度:公称最大粒径较小的混合料>较粗的混合料。To reduce shear failure(pushing,upheaval and paving layer falling,etc.) of bridge deck pavement,firstly,a solid model of the fullscale mechanics is established to use finite element Software ANASYS to analyze shear stress distribution within the bridge deck paving system,and then aiming at the weak link of the interface layer,the deep study on the performance of the interfacial shear between layers is made by means of direct shear tests.The results show that:1) pairs of the SMA flip structure(upper layer SMA-16/ lower layer SMA-13) have obvious advantages in the interface shear strength.;2) compared with SBS modified bitumen and water-based asphalt-based paints,solvent-based binder has better shear resistance;3) in the conditions of immersion in water and freeze-thaw test,the shear strength of the three interfaces exists significant differences,bristles > chisel point > groove;4) test conditions have important influence on the interface shear strength between layers: the shear strength of the dry state > the shear strength of the freezethaw state > the shear strength of the state of immersion in water;5) in the case of applying no positive pressure,the shear strength under the interface between layers: nominal maximum particle size of the smaller mixture > the coarse mixture.

关 键 词：道路工程 剪切性能 直剪试验 层间界面 桥面铺装 

分 类 号：U443.33[建筑科学—桥梁与隧道工程]