基层对水泥砼路面早期性能的影响研究

The study on the influence of base on the early-age performance of the cement concrete pavement

混凝土路面板铺筑完成后到开放交通之前,温度和湿度改变引起的变形受到约束时产生的应力超过混凝土此时的抗拉强度,便会产生早期开裂。研究发现,基层对水泥混凝土路面板早期龄期开裂影响显著,本文从混凝土路面板早期开裂的机理出发,以傍晚和早晨施工铺筑的水泥混凝土路面早期72h阶段的温度场监测数据为例,着重探讨基层参数对混凝土路面板早期开裂的影响,并提出相应的防治措施。

Before opening the traffic and after the construction of cement concrete pavement slab,the cement concrete pavement slab may produce the early cracking,when the deformation of the temperature and moisture change is restrained;the slab stress exceeds the concrete tensile strength.Research founds that base play significantly effect on the early pavement cracking.Basing on the early cracking mechanism of the cement concrete pavement slab and temperature data measured in the early72 hours of cement concrete pavement slab that is constructed in the evening and in the morning,this paper discusses the base parameters impact on pavement early cracking and proposes the corresponding preventive measures.