| Natural Colored Asphalt Mixture It is natural colored hot mix asphalt mixture which is manufactured using natural pebbles, aesthetic crushed stones and sands as aggreate and using de-colorized asphalt as binder. Open grade mixtures width water permeability as well as dense graded mixtures with water impermeability are available. | 
Dense graded type for carriageway
Open graded type for foot paths | |
| Using de-colorized binder, the color of aggregates comes to appear to form a surface well harmonized with natural environment. Remarkable is that when put on service, the binder on surface of aggregates revealing the surface of natural aggregates and the surface get more natural appearance. | | The methods of manufacturing and laying of this mixture are almost the same with ordinary asphalt mixture. | | No dust is generated in fine weather. | | The durability and skid resistance of this pavement is the same as ordinary asphalt pavement. | | Using de-colorized binder that has propertied equal to modified asphalt, this pavement is applicable to heavy traffic carriageways. | |
footpaths, park ways, promenade, squares in parks and events, gardens
precinct of and promenade to shrines, bicycle roads
roads around relic places and sight seeing places
lanes in residential areas | |
| Typical Pavement Structure | |
| 1) Footpaths | 2) Carriageways | | | Class I | | Class II | |  | 3-4cm
10cm | 
| 4-5cm 15cm | | 
| 4-5cm | | Classification of footpaths| I : | footpaths and bicycle roads with no car traffic | | II: | paths where cars with weight of less than 4 tons passes besides pedestrians and bicycles | |
| | The depths of binder course and base course in case of application to carriageways are determined depending on design CBR value and traffic volume. | | In snowy area, a frost heave restraining layer is added. | | For prime coat and tack coat, an emulsion of decolorized asphalt is used. | |
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1) Gradation
Type of
Mixture | Gradation (percent passing weight %) | Remarks | | 19mm | 13.2mm | 4.75mm | 2.36mm | 0.3mm | 0.075mm | | Dense graded | 100 | 100-95 | 80-55 | 60-35 | 25-10 | 10-4 | The gradation ranges are in-company standards. | | Open graded | 100 | 100-95 | 52-23 | 35-15 | -- | 8-2 | |
2) Marshal Properties
| Type of Mixture | Dense graded | Open graded | Remarks | | Standard | actual value | Standard | Actual value | | Density g/cm3 | --- | 2.342 | --- | 2.082 | | Dense graded type was applied to carriageway and open graded type was applied to footpath actually. The standards are in-company standards. | |
| | Stability kN | >=4.90 | 9.45 | >=3.43 | 3.77 | | Flow value 1/100cm | 20-40 | 24 | 20-40 | 23 | | Voids % | 3-7 | 3.6 | --- | 15.9 | | AVFA*1 % | --- | 78.2 | --- | 36.0 | | Binder content % | 5.0-8.0 | 5.8 | 3.5-5.5 | 4.6 | | permeability@cm/sec | --- | --- | --- | 4.68 x 10-2 | | *1:Aggregate Voids Filled with Asphalt | |
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