albert t. yeung department of civil engineering university of … · gdp and per capita gdp of hk...
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Use of green materials in maintenance and construction
Albert T. YeungDepartment of Civil EngineeringUniversity of Hong Kong
Green Buildings: Better Quality of LifeJune 11, 2010
GDP and per capita GDP of HK
Year
1991 1993 1995 1997 1999 2001 2003 2005 2007
GD
P (H
K$
billi
on)
800
1000
1200
1400
1600
1800
Per
capi
ta G
DP
(HK
$ th
ousa
nd)
140
160
180
200
220
240
Gross domestic productPer capita gross domestic product
Construction & demolition
Construction & demolition
?
Strategic Landfills in Hong Kong
West NT Landfill at Nim Wan (WENT Landfill)
South East NT Landfill in Tseung Kwan O (SENT Landfill)
North East NT Landfill at Ta Kwu Ling (NENT Landfill)
Solid Waste Disposal at Landfills
Year
1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007
Qua
ntity
(mill
ion
tonn
es)
0
2
4
6
8
10DomesticCommercialIndustrial ConstructionSpecial
Construction Waste Site Clearance
Tunneling
Demolition
Excavation
Annual Production Rate of C&D Materials
Year
1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007
Ann
ual P
rodu
ctio
n (m
illio
n to
nnes
)
0
4
8
12
16
20
24
C&D MaterialsC&D Waste
10 Mega Infrastructure Projects
二千五佰億元項目 Total worth of HK$250 Billion
Solutions
Minimize the generation of construction wasteRe-generate useful materials from demolition waste
ObjectivesPromote sustainability of our societyProlong the useful life of infrastructure constructedReduce the maintenance and construction costsReduce maintenance frequencyReduce maintenance and construction timeReduce construction hazards and nuisance
Recycling of Waste Materials
Electric wires
Aluminum windows
Concrete
North Tsing Yi Reclamation
Tuen Mun Area 38 Stage 2 Reclamation
33 hectares36 million m3
C&D Material Recycling Facility at Tuen Mun Area 38
Road Curbs
Road Bricks: Examples
PolyU
HKUST
Recycled Glass
Terrazzo Tiles
Recycled Wood
Recycled Wood
Road Repair
In 10 minutes
Penetrating Power
Waterproofing
Remove the old existing roof or wall tilesRemove the bitumen-base waterproofing layerRe-apply the bitumen-base waterproofing layerRe-install the roof or wall tiles
New Green Material
Roof Waterproofing
Waterproofing with Reflex Topcoat
Before
After
ExternalWall
FingerMapFingerMap®®
Mobile biometric Mobile biometric authentication authentication systemsystem
MifareMifare®® card card readerreaderRadioRadio--frequency frequency fingerprint sensorfingerprint sensorLife recognitionLife recognitionGPSGPSLocal timeLocal time
Conclusions
Green materials are now available on the market for construction and maintenance of infrastructuresUtilization of modern technologies can enhance our sustainability