Double - paved pavement performance | Forum

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quangongzi
quangongzi Oct 25 '16

Improve the asphalt mixture compaction

Asphalt pavement paving technology mainly by increasing the thickness of asphalt mixture, slowing down the rate of heat loss to ensure a higher compaction temperature, thereby greatly improving the asphalt mixture compaction. The results show that the paving thickness of asphalt mixture is inversely proportional to the rate of temperature descent, and the coefficient is 1.8. This means that if the layer thickness increased to 2 times the original, in the case of no change in ambient temperature, cooling time extended 3.5 times. Therefore, the two-layer paving can extend the mixture cooling time to ensure that the mixture has sufficient time to make the surface layer of asphalt mixture density to meet the requirements.

As can be seen from Figure 1, the thickness of 4cm asphalt mixture layer, when its initial temperature is 135 ℃, the effective rolling time is about 6min, and when the mixture temperature increased to 160 ℃, the effective rolling time will be extended To 10 min. At the same time, the greater the thickness of the asphalt mixture, the longer the effective rolling time, with the initial temperature remaining constant. When the thickness of the mixture is 4cm, the effective rolling time is 6min, and when the layer thickness is increased to 8cm, the effective rolling time will reach 17min. Therefore, to improve the asphalt mixture rolling efficiency, the best way is to increase the layer thickness.Small Road Roller - Shanghai Doan Machinery Technology Co.,Ltd

To improve the interlayer bonding state

Asphalt pavement paving technology to improve the working principle of the two layers of interlocking is to enable each other to embed pellets, binder can be integrated with each other, the inter-layer friction parameters increased significantly, thereby effectively improving its interlayer adhesion. In this paper, BISAR3.0 program is used to analyze and simulate the state of the maximum shear stress in the interlayer with the standard axial load. It is found that with the increase of the interlaminar friction parameter, the maximum shear stress appears more and more close to the center of the load circle. The results are shown in Fig.

It can be seen from Fig. 2 that the maximum shear stress decreases with increasing depth in the same interlayer contact state. And the maximum shear stress of each layer increases synchronously when the friction parameter increases. The maximum shear stress increases from the fully continuous state to the fully smooth state, and the maximal shear stress increases by 25% while the maximum shear stress increases at the bottom of the basement layer by 12%.

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