Overview

A tender for the grounds of the old city hall included conditions on how the demolition will take place, to encourage selective demolition and the circular reuse of materials. The aim was to impose a criterion that as much building material as possible should be reused and as much soil as possible should be kept on-site. 

Implementation

• The municipality was in close dialogue with the developers to maximise ambitions of the circular criteria while still being realistic about their execution
• The project will be followed closely to ensure that the process is carried through as planned with maximum re-use on site and a minimum of soil dug up
• Direct reuse of the existing building structure is being considered, with calculations of embedded materials and carbon as well as savings with avoided demolition contributing to the decision

Relevant instruments

• Pre-demolition screening and selective demolition

• Instrument for predicting soil production

• Roadmap for soil management

• Guidelines for sustainable soil management and assessment of reuse potential of excavated soils

Overview

A new city hall has been built using recycled concrete in the building foundation and other components. The concrete comes from demolition of eight apartment blocks at Taastrupgård (Demo action 3) owned by KAB, a social housing company. 

Implementation

• Excess soil from the construction of the city hall was used in Taastrupgård

• Cooperation between stakeholders led to successful implementation

• Over 1000 tonnes of concrete were used as 100% recycled aggregate in the foundation of the building

   

Relevant instruments

• Pre-demolition screening and selective demolition

• Instrument for predicting soil production

• Roadmap for soil management

• Guidelines for sustainable soil management and assessment of reuse potential of excavated soils

• Interviews_A_CLOSED_LOOP_OF_CONCRETE_IN_HØJE

Overview

Eight apartment blocks owned by social housing company, KAB, were demolished in 2020, with the separate collection of recoverable concrete. KAB agreed to allow the municipality to have some of the concrete, and the demolition company Søndergaard agreed to deliver the concrete from the demolition to other projects. 

Implementation

• The concrete underwent quality testing, identifying it as suitable for recycling as aggregate in new concrete, and was then crushed and stored for mixing into new concrete
• 2,000 tonnes went into making the foundation and other components of the new city hall 
• A further 6,000 tonnes were used as filler in other projects such as the nearby neighborhood development area Høje-Taastrup C 
• The approach may potentially be replicated in similar apartment blocks owned by another social housing company in the Gadehavegård district

Relevant instruments

• Pre-demolition screening and selective demolition

• Instrument for predicting soil production

• Roadmap for soil management

• Guidelines for sustainable soil management and assessment of reuse potential of excavated soils

Overview

The concrete factory IBF developed and produced a tile from 30% recycled concrete from excess concrete in their own production. It is locally produced in Hedehusene. Høje Taastrup aimed to test the tiles in an area where the sidewalk would be renovated. 

Implementation

• Several stakeholders were in dialogue about the possibility of testing the tiles

• No developer has yet agreed to test the tile due to perceived risk of tiles breaking.

• Another recycled tile from IBF (15 % recycled concrete) will be used in a development area.

Relevant instruments

No relevant instruments developed in CityLoops were used for this demonstration action.

Overview

The focus of this action was on creating circular soil management at city level in order to keep excavation of soil to a minimum and use excess soil locally, instead of driving it farther away. 

Implementation

• A number of CityLoops tools and methodologies were tested, including the circular soil framework

Relevant instruments

• Instrument for predicting soil production

• Roadmap for soil management

• Guidelines for sustainable soil management and assessment of reuse potential of excavated soils