the case for a circular viaduct - cen-cenelec · rijkswaterstaat general presentation 4 november...
TRANSCRIPT
Evert Schut
The case for a Circular viaduct
Oktober 29 2019
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Rijkswaterstaat general presentation 24 november 2019
Rijkswaterstaatprovides infrastructure for:
• protection against flooding (50% lies below sea level)• sufficient clean water• a smooth and safe transport by road and water
• In 2030 Rijkswaterstaat has embedded circular principles in allrelevant work processes
• National ambition: 50% less use of primary resources in 2030
• The Rijkswaterstaat ‘Impulse programme circular economy’ is developed to deliver answers on how to achieve these ambitions.
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Rijkswaterstaat circular ambitions (2016)
• Invitation from construction company to help design a circularviaduct– Together with the client, the concrete producer and knowledge institutes– No payment of anything from any one to any one else
• Why a viaduct?– Lot of concrete, substantial environmental impact– Repeatability: many need to be replaced in the next 10 years
• A choice for a modular design– Derived from the ‘R’ design principles of the Ellen Mac Arthur foundation
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Circular viaduct
• In januari 2019, in use as a temporary bridge at a construction site
• Using modular concrete blocksre-enforced in in 2 directions bysteel bars
• Blocks were designed for 200 years of use
• Deconstruction only 9 monthslater
• Reconstruction next year
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The actual build
• Agreement on how to measurecircularity is important:– R principles are useful design
principles but not useful formeasuring impact
– LCA methodology does measureimpact but: Is not quite clear about measuring
several use cycles over 200 years Gives us no insight in value retention Tells us little about the long term
impact on resource stocks
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What have we learnt so far 1?
• We need a materials passport to remember:– Which materials were used to make the modular blocks– The state of degradation of materials– How to maintain and repair materials– How to deconstruct/ reconstruct elements
• We need to harmonise material passport systems– Who needs which information and when? – Definitions/ terminology/ systems engineering– Links to existing information models like BIM
• We need to make sure we retain information over long periods of time
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What have we learnt so far 2?
• We need to develop a lot of circular and sustainable technology• We need to speed up research for and standardisation of new
circular technology
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What have we learnt so far 3?
• Integrated measurement of circularity in terms of: – Environmental impact of resource use (LCA)– Sustainable use of resources– Maintaining value (functional, material and economic)
• Harmonising circular datasystems for material passports• Speed up standardisation for sustainable / circular technology
In the Netherlands these issues have become a work in progress at NEN/ Platform CB’23.
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Challenges for CEN/ Cenelec