桥面铺装用钢纤维橡胶颗粒沥青混合料性能研究

发布时间：2018-08-21 09:39

【摘要】：当今世界桥梁建设虽取得极大发展,但是近年来由于交通量以及重型车辆的增加,桥面铺装层的破坏越来越明显。从目前桥铺装层的破坏情况来看:主要原因是由于桥面铺装层材料抗剪强度不足,沿路面纵向出现剪切变形破坏;其次由于温度变化以及雨水冲蚀,夏季桥面铺装层出现车辙,冬季容易开裂;还有桥面板跨度大,面板中间因挠度过大,铺装层与桥面板不能保持相同的变形量而出现裂缝。针对以上问题,本论文结合现有的研究成果,对铺装层下面层展开研究。沥青混合料的矿料级配选取AC-20,外掺橡胶颗粒按等体积3%代换,钢纤维掺量以0%、1%、2%、3%四个变量掺入沥青混合料中,通过对路用性能试验和室内桥面铺装层剪切模拟试验分析,取得如下成果:(1)钢纤维掺入橡胶颗粒沥青混合料后,钢纤维均匀分布形成三维网状结构,动稳定度明显提高。(2)通过常低温劈裂试验发现,掺入钢纤维的橡胶颗粒沥青混合料的劈裂强度不但增加,而且具有良好的延展性。(3)钢纤维在橡胶颗粒沥青混合料中具有良好的加筋效果,抗雨水侵蚀能力增强。(4)在室内桥面铺装层剪切模拟试验中得出:钢纤维在橡胶颗粒沥青混合料中能够有效对抗集中应力,抗剪强度明显提高。(5)过多钢纤维容易结团成束,难以达到密实状态。而且钢纤维过多造价过高,综合考虑钢纤维应用在具体实际工程中掺量控制在2%最佳。
[Abstract]:Although the bridge construction in the world has made great progress in recent years, due to the increase of traffic volume and heavy vehicles, the damage of deck pavement is becoming more and more obvious. From the view of the damage situation of the bridge pavement at present, the main reason is that the bridge deck pavement material has not enough shear strength and the longitudinal shear deformation failure along the road surface; secondly, due to the temperature change and Rain Water erosion, the bridge deck pavement appears rutting in summer. It is easy to crack in winter, and there are cracks in the middle of the deck because the deflection of the deck is too large, and the pavement and the deck can not keep the same amount of deformation. In view of the above problems, this paper, combined with the existing research results, carries out research on the underlayer of pavement. The aggregate gradation of asphalt mixture is AC-20, the rubber particles are replaced by the equal volume 3%, the steel fiber is mixed into the asphalt mixture with 4 variables of 0 / 1 / 2 / 2% and 3% respectively. Through the road performance test and the shear simulation test of indoor bridge deck pavement, the asphalt mixture is added to the asphalt mixture. The results are as follows: (1) after the steel fiber is mixed with rubber granular asphalt mixture, the steel fiber distributes evenly and the dynamic stability of the steel fiber increases obviously. (2) it is found by splitting test at normal and low temperature that, The splitting strength of rubber granular asphalt mixture mixed with steel fiber is not only increased, but also has good ductility. (3) Steel fiber has good reinforcement effect in rubber granular asphalt mixture. (4) in the shear simulation test of indoor bridge deck pavement, it is concluded that steel fiber can effectively resist the concentration stress in rubber granular asphalt mixture, and the shear strength is obviously improved. (5) too much steel fiber is easy to cluster into bundles. It is difficult to reach a dense state. Moreover, too much steel fiber is too expensive. Considering the application of steel fiber in practical engineering, the content of steel fiber should be controlled at 2%.
【学位授予单位】：内蒙古农业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U414

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