Sustainable concrete design and construction

1,758 views
1,604 views

Published on

David Bennett, consultant, David Bennett Associates

Published in: Technology, Business
1 Comment
3 Likes
Statistics
Notes
  • Very nice presentation. Thanks!
       Reply 
    Are you sure you want to  Yes  No
    Your message goes here
No Downloads
Views
Total views
1,758
On SlideShare
0
From Embeds
0
Number of Embeds
2
Actions
Shares
0
Downloads
156
Comments
1
Likes
3
Embeds 0
No embeds

No notes for slide

Sustainable concrete design and construction

  1. 1. Sustainable Concrete Design • · • Lowering CO2 in Construction • CO2 Construction Audit • Elegance in Architecture David Bennett Architectural Concrete Consultant
  2. 2. Picture a Glass of Latte What’s the Embodied C02? • Raw Material • Production • Packing • Transport • Shop • Hot Water • Coffee Container • Milk • Sugar
  3. 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
  4. 4. C02 and Concrete Construction • Cement • Aggregates • Ready Mix • Rebar • Formwork /Temporary Work • Plant & Machinery • Labour
  5. 5. Concrete Cement is one sixth of concrete kg C02/tonne • OPC range 930 > 760 • GGBS 54 • PFA 4 • Rocktron 50
  6. 6. Persistence Works
  7. 7. Lowering Cement C02 by 50% • Blend OPC with GGBS/PFA • Carbonation Benefits of OPC
  8. 8. Aggregates are 80% of Concrete Aggregates kg C02/tonne • Natural Washed - 4 • Natural Crushed - 4-10 Synthetic Aggregates • Lytag Sintered PFA 60 • Liapor (expanded shale) 12
  9. 9. 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
  10. 10. 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)
  11. 11. Formwork Temporary Support/ Falsework Disposable Items • Form Face Ply 18mm thick • Plastic Cones • Tie Rods
  12. 12. The Form Face & Sustainable Design • Select Material for a Good Finish • High Reuse Factor • FSC Grade • Re-use in Permanent Architecture • Responsible Design
  13. 13. 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
  14. 14. Concrete Quality and Aesthetic • Visual Concrete Specification • the choice, the mix, the form, the finish Get it right!
  15. 15. Thrifty Beeches
  16. 16. Spedant Works
  17. 17. Kew Herbarium
  18. 18. CHUR House
  19. 19. The C02 Construction Audit Four Buildings Assessed two concrete, two steel • Bill of Quantities • Embodied C02 of Materials • Plant/Machinery/Labour
  20. 20. 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
  21. 21. Construction Audit Examples • Substructure • Superstructure • External Cladding • Finishes • Mechanical Ducting
  22. 22. Building CO2 Audit Summary Element M4C3 % M4S3 % M4C7 % M4S7 % Substructure 136 10 95 4 254 9 160 3 Superstructure 350 27 1348 59 904 31 3411 63 External cladding 263 20 267 11 532 18 545 10 Finishes 432 33 433 19 893 31 911 1 M&E: Fully air conditioned 59 4 59 3 137 5 137 3 Plant & labour 83 6 89 4 190 6 189 4 Total (av.) 1322 100 2291 100 291 100 5353 100 Tonnes CO2
  23. 23. 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
  24. 24. Total C02 Design Solution • Minimise Construction C02 • Utilise Thermal Mass for Long Term Energy Reduction Lower Total C02 Emissions
  25. 25. Concrete is just like a good coffee - Make it the low C02 blend!

×