INGENIEUR
INGENIEUR
Segregation is another method that can be used to prevent and reduce construction waste . Segregation is a process implemented at source whereby waste is segregated into specific types of materials . The aim of segregation is to increase the potential of construction waste material for re-use and recycling , and indirectly , to reduce the disposal of waste to landfill ( as shown in Figure 3 ).
ii . Preparing for re-use
The construction materials generated should be re-used on site or salvaged for re-use to the greatest extent possible . Disposal should only be considered as the ultimate alternative . Some examples under this initiative are shown in Table 1 .
Re-use of construction waste generated from renovation and demolition activities using the deconstruction method is highly recommended .
Deconstruction is a process whereby building components are dismantled carefully to salvage components for re-use and recycling . This technique also can be included in the method statement by determining the specific components to be used . Indirectly , this technique will increase the re-use and recycling rate of the project . Among the benefits derived from the deconstruction method are as follows :
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Encourages the re-use of construction materials - re-use costs less than disposal ;
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Reduces the negative impact on the environment from the extraction of natural resources ;
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Reduction in the cost of transporting , and energy used in converting , raw materials to be used in new buildings and construction ;
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Saves cost because deconstruction reduces the cost of disposal
See Figure 4 for an example of deconstruction .
Figure 4 : Roof truss dismantled carefully before its use for other purpose ( Source : Solid Waste and Public Cleansing Management Corporation , 2015 )
Waste material Top soil Formwork Aggregate and concrete
Example Material can be used for landscaping Formwork from concrete work can be used repeatedly before disposal
Aggregate and concrete waste from hacking activities can be re-used for embankment on soft soil around construction sites
Table 1 : Examples of re-use of waste material in construction Source : Solid Waste and Public Cleansing Management Corporation , 2015
Note : For the list of waste materials that can be re-used on site , please refer to clause 3.3.2 ( Re-use ) - Guidelines on Construction Waste Management ( CIDB Malaysia , 2008b ).
64 VOL 66 APRIL - JUNE 2016