Appendix F: Interview with Dr. Wing Gun Wong, Civil Engineering Professor from Hong Kong Polytechnic University
The EPD is currently building their first test road with rubberized asphalt.
Eco-Park is the chosen location as it already is to be a new center of recycling in
Hong Kong. The EPD is using a method called Arizona concrete after professors from
HKPU began researching rubberized asphalt 3 years ago. Professor Wong and
others visited Arizona to review this technology. Wong was hesitant at first but then
he was shown two roads, one rubberized asphalt and the other standard asphalt both
under similar conditions. After ten years of wear and tear the rubberized asphalt still
looked new while the “other is cracked all over the surface.” When tested by Arizona
the concrete actually outperformed expectations.
Professor Wong began researching this technology and its applications in
Hong Kong. Although the Arizona mixture works, Hong Kong has its own design
criteria and requires a different mixture for maximum performance. Approximately
one and a half years ago a privately financed road was constructed using a rubberized
asphalt mixture that was more refined for Hong Kong. Wong has submitted many
papers to the Highway and Environmental Protection Departments to try and get
rubberized asphalt roads to be constructed.
There is a company in mainland China that recently completed a mixing plant
and will use a copy of the Arizona process, which has already been thoroughly tested.
The differences between standard and Arizona processes are very few. The mixture
must be kept 10 degrees Celsius hotter, a separate tank must be installed and mixing
blades must be strengthened. The tank is to hold the rubberized cement before it is