Ding Q.-J.,Wuhan University of Technology |
Shen F.,Wuhan University of Technology |
Liu X.-Q.,Wuhan University of Technology |
Liu X.-Q.,Hubei Province Institute of Communications Planning and Design |
And 2 more authors.
Chang'an Daxue Xuebao (Ziran Kexue Ban)/Journal of Chang'an University (Natural Science Edition) | Year: 2010
By using stationary wave method to test sound absorption coefficient of draining asphalt pavement, the sound absorption rule of draining asphalt pavement with different porosities, grain sizes and thicknesses is researched. Combining the noise testing result of experimental road, the denoising performance of draining asphalt pavement is evaluated. The test results show that: the draining asphalt pavement can absorb the road noise effectively, which has a lot of connected porosities, and whose average and peak of sound absorption moves toward to low frequency when the thickness is increased, and the sound-absorbing performance is better while using smaller size nominal maximum size of aggregate. The average and peak of sound absorption coefficient of OGFC-13 are 0.402 and 0.669 respectively, when porosity is 20%, thickness is 40 mm; Comparing with the common AC-13C asphalt pavement, the noise intensity of experimental road is reduced by 4.7 dB(A) while tested in high-speed traffic. So, the denoising performance of draining asphalt pavement is excellent.
Wu J.-M.,Chang'an University |
Zong W.,Hubei Province Institute of Communications Planning and Design
Chang'an Daxue Xuebao (Ziran Kexue Ban)/Journal of Chang'an University (Natural Science Edition) | Year: 2011
The microstructure characteristics of secondary recycled pavement materials after cement stabilizing were observed by SEM (scanning electron microscope). Those material properties after being long-term used and secondary recycled were analyzed, their unconfined compressive strength, splitting strength and modulus were tested, and the frost resistance, water stability and anti-erosion resistance were also examined. As the result, the CBR value and aggregate crush value were put forward to evaluate the secondary recycling, the strength of secondary recycling materials is lower than ordinary base materials stabilized by cement because the existence of asphalt components. And the temperature exerts an obviously influence on the compressive strength. The results also indicated that the strength and pavement performance of cement secondary recycling materials can meet the requirements for base and subbase in asphalt pavement.