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.