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Redevelopment of Pilestredet Park Project description Background Construction of a new National Hospital resulted in some parts of the Old National Hospital requiring demolition and consequent redevelopment of the site into mixed use residential and commercial premises. 16 buildings were demolished, representing nearly 50,000m2 of total floor space. Waste Minimisation Activity Golder Associates performed an analysis of different options for handling concrete and brick demolition waste. This resulted in identification of optimal resource management systems for increased recycling and reduced environmental impact. Materials Targeted Approximately 37,000 tonnes of demolition wastes, consisting of 27,750 tonnes of concrete and 9,250 tonnes of masonry brick. This was re-cycled to fulfil the on site requirement for road base and backfill materials. Project Drivers for Waste Minimisation Cost benefits from reduced disposal costs, reduced primary materials costs and reduced transportation costs Client requirement to implement projects sustainably with a 90% recycling target. Regulatory requirements to meet recycling targets

Project profile Location: Oslo, Norway Project Duration (in relation to the described activities): 2000-2001 Client: The Norwegian Directorate of Public Construction and Property (Statsbygg) Key Statistics: 37,000 tonnes of demolition waste were re-cycled Savings of £400k in demolition works Company Profile Golder Associates (UK) Ltd Environmental and Engineering Consultants

Project Approach to Waste Minimisation and Sustainable Use of Resources

Design Phase Activities:

Enabling waste minimisation and the use of non-primary materials:
By quantifying the concrete and masonry materials arising from the planned demolition works, it was possible to integrate these into the new construction planning as a resource. By using the Demolition Wizard Tool, it was possible to assess financial and environmental costs/benefits of the various options for this internal resource management. Based on the results of the work a recycling target of 90% of wastes was set by the Client.

Better handling of materials:
The Demolition Wizard Tool provides assessment of scenarios relating to various transportation, recycling, handling and segregation options for materials and resources during site clearance and redevelopment works. This assessment is based on the sustainability parameters of environmental and social impact, as well as financial implications. Through analysis of the scenarios, a case was made for the most appropriate means of separating the demolition materials during the actual demolition.

Good practice in quantifying, costing and recording data on wastes and materials:
A waste arising and resource requirements gap analysis at an early stage in the planned redevelopment works allows for increased sustainability targets to be set and achieved, for example on recycling rates, energy consumption, and emissions. At Pilestredet Park, it was thus possible to recycle 90% of the demolition wastes as well as reduce emissions and city traffic.

Good practice in demolition and deconstruction activities:
By identifying recyclable and reusable materials at an early stage in the works, it is possible to incorporate sustainable demolition methods into the Tender Documents. Although these may incur increased demolition costs, these are more than compensated for through cost savings in disposal fees, transportation and import of raw construction materials.

Construction Phase Activities:

Using local approaches to encourage more sustainable practice:
A central location for sourcing materials during construction was provided by establishing an on site demolition waste recycling plant. This reduced the requirement for transportation of both waste off site and incoming construction materials, reduced burden on the local disposal facilities and increased awareness in benefits from on-site recycling.

Lessons Learned, Benefits and Barriers

Through the use of the Demolition Wizard Tool, the project management team at Pilestredet Park was able to achieve overall cost savings of approx. 10% on the demolition works (amounting to ca. £400,000) as well as recycling more than 90% of the demolition wastes for onsite applications in the ensuing construction works. The main barrier to utilizing the tool is timing! It needs to be used at a strategic stage, early in the planning.

Example Graphs from The Demolition Wizard Tool:

City traffic load for the selected scenarios at Pilestredet Park
Costs for the selected scenarios at Pilestredet Park

 

 

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