1. Sustainable Concrete Design
• ·
• Lowering CO2 in
Construction
• CO2 Construction Audit
• Elegance in Architecture
David Bennett
Architectural Concrete Consultant
2. Picture a Glass of Latte
What’s the Embodied C02?
• Raw Material
• Production
• Packing
• Transport
• Shop
• Hot Water
• Coffee Container
• Milk
• Sugar
3. Concrete and C02
It’s just like a good cup of coffee
Expresso, Americano, Latte, Macchiato,
Mocha
Insitu, Precast, SCC, GRC, Ductal, Rammed
Discuss
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13. C02 and Concrete Construction
• Cement
• Aggregates
• Ready Mix
• Rebar
• Formwork /Temporary
Work
• Plant & Machinery
• Labour
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17. Concrete
Cement is one sixth of concrete
kg C02/tonne
• OPC range 930 > 760
• GGBS 54
• PFA 4
• Rocktron 50
21. Typical Concrete Mix
Constituents
kgC02/m3
OPC 180 kg Ribblesdale 137
GGBS 180 kg C&M 8
Sand 750 kg Lea Valley 3
Gravel 1200 kg Thames Estuary 5
Water 180 kg Thames Water 0
Admixture ignore
Embodied kg C02/m3 153
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23. CO2 of Wood
Captured CO2 = 1.84 x density
Embodied CO2
Process plywood 670 kg C02/tonne
Wisa – birch phenolic faced
18mm thick 29 kg CO2/m2
(assumes the wood is carbon zero)
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27. Formwork
Temporary Support/
Falsework
Disposable Items
• Form Face Ply
18mm thick
• Plastic Cones
• Tie Rods
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30. The Form Face & Sustainable
Design
• Select Material for a Good Finish
• High Reuse Factor
• FSC Grade
• Re-use in Permanent Architecture
• Responsible Design
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33. Rebar C02
kg C02/tonne Total
Two Stage Process
1. Coil Manufacture 422
2. Fabrication
a) Bar 63 485
b) Mesh 88 501
Celsa/ BRC Audit
includes production , staff travel and transport
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39. Concrete Quality and
Aesthetic
• Visual Concrete Specification
• the choice, the mix, the form, the finish
Get it right!
47. The C02 Construction Audit
Four Buildings Assessed
two concrete, two steel
• Bill of Quantities
• Embodied C02 of Materials
• Plant/Machinery/Labour
48. Some Anomalies
Some references are distorted
• Resin, Polyurethane, Paint, PVC
resolve micron/m2
• Structural Steel
new or recycled? check
• Lightweight Lytag Concrete
high C02/m3
RECONCILE them
52. Building CO2 Audit Summary
Possible reductions in CO2 for lean solution
Element M4C3 % M4S3 % M4C7 % M4S7 %
Frame - na -768 na -1972
All recycled steel
M&E;
a) eliminate suspended -60 na -149 na
ceiling
b) Reduce ductwork -53 na -124 na
Public transport -77 -83 -183 -182
Total CO2 reduction -190 -14 -851 -37 -455 -16 -2154 -40
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57. Total C02 Design Solution
• Minimise Construction C02
• Utilise Thermal Mass for Long Term
Energy Reduction
Lower Total C02 Emissions
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61. Concrete is just like a good coffee -
Make it the low C02 blend!