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mixed into batches of concrete. The increase in temperature and the strengthened

blades are to cope with the thicker viscosity or higher resistance.

The EPD has already looked into the environmental releases and determined

they are within acceptable levels. The increased costs are “very minimal” compared to

standard materials. Once a market and an industry are established the cost is very low.

Rubberized asphalt also lasts longer, which offsets the initial cost. 20 million Hong

Kong Dollars, over 150 million USD is the approximate startup cost for plant to turn

tyres into crumb and refined rubber

Rubberized asphalt can be mixed for up to one day to increase strength and

reduce on site compaction. It can also be made and poured on site without any

mixing. Costs in Hong Kong are still high, especially compared to China or the USA

where there is a large market, industry and already has rubber asphalt mixing plants


Rubberized asphalt is used in the top 2-4 inches of the road. It replaces

conventional binding materials in bitumates. Costs too much for entire concrete of

road, but still receives advantageous affects for being laid on the top. Scrap tyres

perform better than rubber that was created for use in asphalt.

In Eco-Park the Highway and Environmental Departments will be testing the

road with non-destructive equipment. The road will be reviewed directly after be

created and every four months afterwards. EPD is now in a hurry to use rubberized

asphalt and is testing the Arizona mix in Hong Kong. “EPD is in a rush”-the Arizona

concrete “may not be applicable”-the Arizona mix “may not be the best mix” for

Hong Kong’s design criteria. While the EPD is rushing forward, the Highway

Department is responsible and is requiring more testing before implementation.


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