沥青路面排水层结构优化设计

以多层弹性层状体系理论为基础建立沥青稳定碎石排水层的结构模型,在此模型中通过对排水层模量、排水层厚度以及模量和厚度的综合分析确定了最优的结构技术,有效的解决了路面的早期破坏。

多层排水沥青路面交通荷载适用性研究

为研究多层排水沥青路面的交通荷载适用性,设计了密级配沥青路面、单层排水沥青路面、双层排水沥青路面和三层排水沥青路面这4种典型路面结构,依据规范设计指标对4种路面结构进行结构验算,结果表明4种路面结构可用于任何交通等级道路。其次,采用局部三轴多级加载试验,以最接近实际路面状态的试验条件评价多层排水沥青面层结构的高温承载力。结果表明:与密级配沥青路面相比,单层、双层和三层排水沥青路面的高温承载力分别降低了19.1%、56.7%和66.0%。随着排水沥青面层厚度的增大,路面结构高温承载力降低。单层排水沥青路面可用于特重交通等级道路,双层和三层排水沥青路面可用于重交通等级以下道路。

Bond condition between surface layer and immediate layer in porous asphalt pavement

Through the shear tests on composite specimens using four different kinds of tack coat material （epoxy resin, SBS modified emulsified asphalt, SBS modified asphalt and H# bridge waterproof material）, the bond condition between layers of porous asphalt pavement under traffic load, temperature variation and moisture situation is evaluated. The test results show that the bond strength decreases with the rise in temperature, and the relationship between shear strength and temperature can be expressed by a logarithm curve at a high reliability. Under the action of traffic load, the value of shear strength of the mixture right under the centre of the wheel track is smaller than that of other parts of the pavement. It is also found that some effects concerning moisture have comparative effects on the bonding of the two layers. Given all the results achieved during the study, it will be quite rewarding to make rational comparisons during selecting the sound type of tack coat.