纤维格栅增强机场双层道面层间黏结性能  

Interface Bond Property of Double-Layer Airport Pavement with Fiber Grid Reinforcement

作　　者：姜乐[1] 翁兴中[1] 颜祥程[1,2] 刘军忠[1] 万希存 张广显[1] 

机构地区：[1]空军工程大学航空航天工程学院 [2]95746部队 [3]空军北京设计室

出　　处：《建筑材料学报》2013年第6期1025-1031,共7页Journal of Building Materials

基　　金：军队科研基金资助项目(KJYZ0909;总990713)

摘　　要：为了研究纤维格栅增强机场水泥混凝土双层道面层间黏结性能，采用室内水泥混凝土双层小梁试件模拟机场水泥混凝土双层道面，然后测试双层小梁中部截面高度方向上的应变和上、下梁底部的挠度，获得上、下梁底部的应变比和挠度差，求得双层小梁层间结合系数K．结果表明：水泥混凝土双层小梁中部截面高度方向上的应变基本呈线性分布，符合平截面假设；下层梁承受全部拉应力，上层梁主要承受压应力；双层小梁层间摩擦力引起上、下梁底部应变减少44．44％～98．46％；纤维格栅的加入及纤维格栅和旧水泥混凝土表面处理使双层小梁层间结合系数提高4．60％～15．73％，上、下梁底部挠度差减少为0．004～0．016mm，改善了双层小粱的整体受力性能和变形性能；不同纤维格栅类型对双层小梁层间黏结性能的影响程度无差别．In order to study the interface bond property of cement concrete double-layer airport pavement with fiber grid reinforcement, the cement concrete double-layer beam specimen was used to simulate ce- ment concrete double-layer airport pavement. The strains along the depth at central section of double-layer beam and the bottom deflections of upper and lower beams were tested. The bottom strain ratio and deflec- tion difference of upper and lower beams, the coupling coefficient K of double-layer beam were calculated. The results indicate that the distribution of strains is linearly along the depth at central section of double- layer beam, which is coincided with the plane sections hypothesis. The lower beam bears tensile stress en- tirely, and the upper beam bears compressive stress mainly. The friction between upper and lower beams causes the bottom strains of upper and lower beams reduce 44.44%-98.46%. Reinforcing with fiber grid and processing fiber gird and old cement concrete surface not only increase the coupling coefficient at the range of 4.60%- 15.73G but also decrease the bottom deflection difference the number of which ranges from 0. 004 mm to 0. 016 mm, thus improve the integral force performance and deformation ability of double-layer beam. The effects of fiber grid types on the interface bond properties of double-layer beam have no difference.

关 键 词：纤维格栅 机场水泥混凝土道面 双层小梁 黏结性能 挠度 应变 

分 类 号：U416.216[交通运输工程—道路与铁道工程]