沥青路面裂缝的形成及防治
摘要
裂缝是路面损坏的一个大问题,由于各种因素的影响,沥青路面初期产生的裂缝对沥青路面使用性能常无明显影响,但由于半刚性基层自身干缩和温缩应变胀缩产生的拉应力超过半刚性基层自身的极限抗拉强度,使其从强度薄弱处产生断裂,随着路面使用时间的延长。已有的裂缝逐渐向上扩展到路表,横向裂缝不断增加。缝宽不断增大,横向裂缝再不断本文源自辣文论文网附生纵向裂缝,最终形成大小不等独立板块,在表面水的作用下,致使裂缝附近基层的含水量加大,甚至饱和。其结果是路面强度明显降低.在大量行车荷载反复作用下,产生冲刷、唧浆和沉陷等现象.聚终导致路面很快产生结构性破坏,使道路结构逐渐丧失承载能力。因此,在施工时就要防止裂缝的产生,要及早发现并处理路面裂缝,防止裂缝扩大。
关键词:沥青路面;裂缝原因;防治措施
Asphalt Pavement Cracks Causes and Control Measures
ABSTRACT
Crack damage to the road is a big problem, as a result of various factors. Asphalt Pavement Cracks on the asphalt pavement performance often no significant impact However, semi-rigid and self shrinkage strain Pavament expansion and contraction caused by the stress of over semi-rigid self-tensile limit , its strength from the weakness of fracture, with road use of the time extension. The cracks have gradually expand upward to the roadside tables, horizontal cracks growing. Elastically growing, horizontal cracks are further supports longitudinal cracks, ultimately forming an independent board size, i论文网http://www.751com.cn/n the role of surface water, causing cracks in the water near the grassroots intensify, or even saturation. The result is significantly lower intensity of the road. In a large number of traffic under repeated loading, washing, jack slurry and phenomena such as subsidence. Poly finally led to the road soon produce structural damage, and road structure gradually lose capacity. Therefore, the construction will prevent the creation of cracks, early detection and treatment pavement cracks to prevent the expansion of cracks.
Key words: Asphalt Pavement;Cracks ;Preventive Measures
目录
前言 1
1 沥青路面裂缝产生的原因 2
1.1沥青路面裂缝的形式、形成及危害 2
1.2 沥青路面裂缝产生的原因 3
1.2.1 荷载型、温度、沉降裂缝 3
1.2.2 横向、纵向、网状和反射裂缝 3
2 沥青路面裂缝的应力分析 5
2.1 结构性破坏裂缝 5
2.2 温度裂缝 5
2.2.1 低温裂缝 5
2.2.2 温度疲劳裂缝 6
2.2.3 光弹试验 6
2.3 半刚性路面的反射裂缝和对应裂缝 6
2.3.1 由半刚性基层温缩开裂引起的反射裂缝 6
2.3.2 由半刚性基层干缩开裂引起的反射裂缝或对应裂缝 7
3 影响裂缝产生的主要因素 8
3.1 沥青及沥青混合料的性质 8
3.2 基层材料的性质 8
3.3 气候条件 8
3.4 沥青路面的老化引起裂缝 8
3.5 交通量和车辆类型 8
3.6 施工因素 9
4 沥青路面裂缝的防治措施 10
4.1 提高路基工作区的强度和稳定性 10
4.2 基层应有合理厚度 11
4.3 修筑防裂路面 11
4.4 选择防裂性能好的材料 11
4.5 设置应力吸收层 12
4.6 新铺半刚性基层的预开裂技术 12
4.7施工控制裂缝发生 13
致谢 14
参考文献 15
前言
,近几年,随着汽车工业的不断发展,车辆的行驶速度愈来愈快,车辆对路面行使条件要求也愈来愈高。但是由于沥青路面产生各种裂缝,不仅对路面的连续性和平整性产生了破坏,影响车辆的行驶舒适性,而且还容易造成水等有害物质进入其中,影响了道路的使用寿命,因此,结合本次在沈大连接线改造工程中的实际情况,对一些路面裂缝产生的原因及防治措施谈谈自己的一些经验。1343