發(fā)布時間：2018-08-21 09:39

【摘要】：當今世界橋梁建設雖取得極大發(fā)展,但是近年來由于交通量以及重型車輛的增加,橋面鋪裝層的破壞越來越明顯。從目前橋鋪裝層的破壞情況來看:主要原因是由于橋面鋪裝層材料抗剪強度不足,沿路面縱向出現(xiàn)剪切變形破壞;其次由于溫度變化以及雨水沖蝕,夏季橋面鋪裝層出現(xiàn)車轍,冬季容易開裂;還有橋面板跨度大,面板中間因撓度過大,鋪裝層與橋面板不能保持相同的變形量而出現(xiàn)裂縫。針對以上問題,本論文結(jié)合現(xiàn)有的研究成果,對鋪裝層下面層展開研究。瀝青混合料的礦料級配選取AC-20,外摻橡膠顆粒按等體積3%代換,鋼纖維摻量以0%、1%、2%、3%四個變量摻入瀝青混合料中,通過對路用性能試驗和室內(nèi)橋面鋪裝層剪切模擬試驗分析,取得如下成果:(1)鋼纖維摻入橡膠顆粒瀝青混合料后,鋼纖維均勻分布形成三維網(wǎng)狀結(jié)構(gòu),動穩(wěn)定度明顯提高。(2)通過常低溫劈裂試驗發(fā)現(xiàn),摻入鋼纖維的橡膠顆粒瀝青混合料的劈裂強度不但增加,而且具有良好的延展性。(3)鋼纖維在橡膠顆粒瀝青混合料中具有良好的加筋效果,抗雨水侵蝕能力增強。(4)在室內(nèi)橋面鋪裝層剪切模擬試驗中得出:鋼纖維在橡膠顆粒瀝青混合料中能夠有效對抗集中應力,抗剪強度明顯提高。(5)過多鋼纖維容易結(jié)團成束,難以達到密實狀態(tài)。而且鋼纖維過多造價過高,綜合考慮鋼纖維應用在具體實際工程中摻量控制在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%.
【學位授予單位】：內(nèi)蒙古農(nóng)業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U414

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