水泥混凝土路面固化翘曲试验研究

Experimental Study on Warp of Concrete Road Slab upon Curing

在水泥混凝土路面硬化过程中,由于各种因素引起的固化翘曲将长期存在,会对其平整度、耐久性产生重要影响.通过野外铺筑水泥混凝土足尺试验路面,观测、分析了5种养生方式下其早期、终凝时的温度场.结果表明:普通养护剂养生和塑料薄膜养生分别使水泥混凝土路面产生了7.1,6.5℃/26cm的内嵌温度梯度;虽然不同养生方式下水泥混凝土路面早期温度场变化规律基本相同,但差异也较为明显,而且这种差异主要由养生材料的太阳辐射吸收率、热交换系数等参数不同所致.

The warp of PCC slab for road pavement resulted by various factors during curing has been a problem in road engineering for long, and it has a great bad effect on the smoothness and durability of con- crete pavement. The temperature fields of full-scale field placed concrete slabs at early age and final setting with five different curing methods were determined and analyzed. Analyses of the temperature fields at fi- nal setting shows that the internal temperature gradient of 7.1 and 6.5℃/26 cm are built in the slabs with ordinary curing and plastic sheet cover curing respectively. The comparison of the temperature fields of the slabs with different curing methods at early age indicate that although they have about the same change rule, the difference still exists. And the differences are mainly due to the thermal parameters of the curing materials used such as solar energy absorption coefficient and heat exchange coefficient.