不同隔离层水泥混凝土路面层间力学性能

Mechanical Performance of Interface between Cement Concrete Pavement and Lean Concrete Base Treated with Different Bond-breaking Layers

为了给设置了隔离层的路面进行结构分析时提供参数以及优化实体工程的隔离层方案,探讨了贫混凝土基层上铺筑水泥混凝土面层时采用稀浆封层、土工布隔离层与蜡制养护剂隔离层的界面力学性能差别。通过采用了不同隔离层的水泥混凝土路面上进行的层间力学性能试验和室内直道路面力学性能试验研究,测定了不同隔离层路面层间粘结应力、层间摩擦力和室内直道不同隔离层水泥混凝土路面板底部的动应力。现场面层混凝土层间粘结应力试验表明,在减少层间摩擦力、降低层间粘结应力方面,稀浆封层、蜡制养护剂隔离层优于土工布隔离层。而室内直道混凝土路面动应力试验结果表明,沥青混凝土隔离层缓冲应力的功能明显优于无隔离层路面及稀浆封层、蜡制养护剂隔离层路面。

This research explored the variation of mechanical performance at slab-base interface of pavements with variety of bond-breaking layers, including emulsified asphalt slurry seal （EASS）, geotextile and emulsion wax curing agent （ EWCA）, installed between the concrete pavement surface slabs and the lean concrete （LCB） base to offer parameters for structure analysis of pavements with bond-breaking layers and to optimize the selection of bond-breaking layers for the practical road engineering projects. Via the field mechanical performance tests of slab-base interface treated with different bond-breaking layers in some cement concrete pavements and the indoor straight-line mechanical performance tests, this research tested the bonding stresses and the frictional forces at slab-base interface of pavements under different bond-breaking conditions as well as the dynamic stresses at the bottom of indoor straight-line pavement slabs atop different bond-breaking layers. The finding from the field test for bonding stress between slab-base layers indicates that EASS and EWCA did better than geotextile as bond-breaking layers in reducing friction or bonding stress between slab-base layers. And the finding from the indoor straight-line dynamic stress test indicates that as bond-breaking layer, AC did far better than no bond-breaking layer, EASS and EWCA in alleviating stress.