Drainage PavementIt is a asphalt mixture permeable water that is developed in order to enable draining rain waters from pavement structure (usually at the part of surface course), thus mitigate water splashing, enhance visibility and skid resistance. In addition, the large void content enables absorption of noise and decrease the noise generation generated between tires and road surface.
As high viscosity modified asphalt is used as binder, durability is excellent.
Hi-Puddless is really puddle less. |  | |
- Void content is around 20 %, so is excellent at the capability of draining.
(permeability coefficient: 10-2cm^sec or more) - As it has noise absorbing effect, traffic noise is decreased.
- It is excellent at rutting resistance at high temperature.
- It is excellent at raveling resistance.
| - Expressways and ordinary roads with high speed traffic (for securing safety in rain fall)
- Roads in densely inhabited and heavy traffic areas (for decreasing traffic noise)
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| In addition to high dynamic stability, the rise of pavement temperature in summer season is small resulting less rutting.
Fig. 1 The Result of Wheel-Tracking Test
| Nevertheless it is a mixture of high void content, the raveling loss is small not inferior to the mixtures used in cold region. Fig. 2 The Result of raveling Test 
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Properties at Marshall Tests
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Table-1 Results of Marshall Tests (Example)Specific
Value | A Porous
Mixture | Hi-
Puddless | | Density g/cm3 | 1.927 | 1.947 | | Voids % | 22.2 | 21.4 | | Saturation % | 29.6 | 30.6 | | Stability kg | 343 | 823 | | Flow 1/100cm | 38 | 38 | Residual
Stability kg | 74.8 | 90.2 | Optimum
binder content % | 5.0 | 5.0 | |
| Fig. 3 Standard Gradation | | As Compared to same kind of mixtures, the value of flow is almost the same, but stability and residual stability are superior to them. | The maximum aggregate size is 13 mm and gradation should be that 20 % or so percentage of air voids are secured. | |
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