水泥混凝土路面早期裂缝的形成机理
Research on Forming Mechanism of Inchoate Cracks in Cement Concrete Pavement
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摘要: 为了为混凝土路面设计和计算提供一种新的思路,从混凝土路面面层与基层之间的层间结合关系,定性 分析了板底早期裂缝的形成机理,利用已有的模型计算混凝土收缩过程中由于基层的约束而产生的拉应力,并 分析了这种拉应力对路面板早期开裂的影响.在此基础上,利用断裂力学的原理分析了早期裂缝对路面使用性 能和疲劳寿命的影响.Abstract: To provide a new method of the design and calculation of concrete pavement,based on the characteristics of the interface between the surface and base of cement concrete pavement, the forming mechanism of inchoate cracks in concrete slab is analyzed, tensile stress resulted from base restriction to concrete shrinkage is calculated by using the existing model, and its effect on inchoate cracks in cement concrete pavement is discussed. Furthermore, the effect of conerete inchoate cracks on the performance and fatigue life of concrete pavement is investigated using the fracture mechanics principle.
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Key words:
- cement concrete pavement /
- inchoate crack /
- shrinkage tensile stress /
- fracture mechanics
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