摘要
为了评价露石混凝土对桥面铺装结构稳定性的改善,利用复合试件直接剪切试验和拉拔试验,研究了露石表面、刻槽表面、凿毛表面和原状表面的抗剪强度随正压力的变化情况,以及防水层存在对各纹理表面抗剪强度的影响。结果表明:不同正压力作用下,露石表面的抗剪强度及随正压力增大速率都明显高于其他表面形式;防水层对层间过渡区的抗剪强度贡献取决于桥面,表面纹理丰富和粗糙,内摩阻角大,则防水层的粘结贡献就小;露石表面抗剪强度主要由其表面丰富的纹理形成的摩阻力提供,所以露石表面的抗剪强度受防水层影响较小,因此使用露石桥面板能够明显提高桥面铺装的结构稳定性。
In order to evaluating the improvement of structural stability for concrete bridge deck pavement,the change of shearing strength with different positive pressures and effect of waterproofing layer on shearing strength are researched on the basis of direct shear testing and pull-out test of composite sample, which concrete surface are exposed-aggregate,grooving,chisel and untreated respectively.The results show that shearing strength of exposed-aggregate is higher than other forms of surface under different positive pressures,and the increasing rate with positive pressures is also significantly higher than others.Contribution of waterproofing layer to the shearing strength depends on the concrete surface.Rich and rough surface texture has large friction angle,so the shearing strength originates mostly from frictional resistance and waterproof layer contributes little to it.Because shearing strength of exposed-aggregate comes mainly from friction,the waterproof layer has less effect on it.So application of exposed-aggregate on the concrete bridge deck can significantly improve the structural stability of bridge deck pavement.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2010年第1期22-24,69,共4页
Journal of Wuhan University of Technology
基金
西部建设科技项目(200731822301-8)
关键词
道路工程
混凝土桥面铺装
露石混凝土
结构稳定性
road engineering
concrete bridge deck pavement
exposed-aggregate cement concrete
structural stability
