X hits on this document





63 / 78

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

state universities.

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


Document info
Document views300
Page views308
Page last viewedSun Jan 22 02:27:45 UTC 2017