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翘曲应力对水泥路面有很大的破坏性,因此设法减少板块的温度波动非常有益。通过埋设路面温度传感器进行现场实测并对加铺和未铺开级配橡胶沥青磨耗层的水泥路面进行热性能定量分析,结果表明:沿水泥板厚的温度纵剖面(梯度)为非线性,昼夜间温度板顶变化很大而板底变化较小;水泥路面上加铺开级配磨耗层后,汽车通行时产生的通风效应,能减少昼夜间水泥板的温度波动。开展考虑温度梯度非线性的三维有限元分析,表明加铺了开级配磨耗层的水泥路面,夏天的翘曲应力会减小。进一步研究指出汽车行驶能增大路面的通风效应,而无车辆通行路面的开级配磨耗层对水泥板顶与板底温度差的减小作用就小得多。
Warpage stress is very damaging to the cement pavement, so it is helpful to try to reduce the temperature fluctuations of the slab. The on-site measurement was carried out by embedding the pavement temperature sensor and the thermal performance was quantitatively analyzed on the pavement with and without pavement. The results showed that the longitudinal profile (gradient) along the cement thickness was non-linear, day and night Between the top of the temperature plate changes and the bottom of the small changes; plus pavement spread on the cement pavement wear layer, the ventilation effect of traffic generated when the day and night can reduce the temperature fluctuations of the board. A three-dimensional finite element analysis considering the nonlinearity of the temperature gradient shows that the warpage stress of the summer will be reduced with the addition of a cement pavement with an open wear layer. Further research shows that vehicle driving can increase the ventilation effect of pavement, and there is no much effect of reducing the temperature difference between the top of cement board and the bottom of board when the open grade wear layer of vehicle-free pavement is open.