沥青加铺层抗反射裂缝足尺疲劳试验

针对水泥混凝土路面加铺改造后容易产生反射裂缝的缺点，采用大型疲劳试验台架进行不同沥青加铺层结构层抗反射裂缝的对比试验，模拟荷载作用下加铺层结构温度型和荷载型反射裂缝的产生和发展过程，评价了不同加铺层方案的防裂效果。结果表明：应力吸收层可有效消解水泥混凝土板块接缝处的应力集中现象，防止水泥混凝土面板由于温缩及荷载作用引起的加铺层反射裂缝；设置玻璃纤维格栅及土工布并不能很好的解决路面的反射裂缝问题。

Full-scale-fatigue test on anti-reflective cracking of asphalt overlay

Reflection cracks often occur in the overlay on old cement concrete pavement. This paper adopted large-scale-fatigue experimental platform for contrastive experiments of different overlay structures to resist reflective cracking, simulated the initiation and extension process of thermal reflective cracking and load reflective cracking of overlay, and tested the anti-cracking effect of different overlays. The results show that stress-absorbing layer can effectively eliminate the stress concentration phenomenon at joints of cement concrete and avoid the reflective cracking of overlay caused by thermal shrinkage of cement concrete slab and load. But setting fibre grids and geotextile cannot solve the reflective cracking of pavement. 4 tabs, 7 figs, 7refs.