Publicidad
Publicidad

Más contenido relacionado

Similar a CALUMEX Q_cem_Presentatie_Final_Final.pdf(20)

Publicidad

CALUMEX Q_cem_Presentatie_Final_Final.pdf

  1. low carbon rapid set cement binder Quaternary Cement The 9th International Drymix Mortar Conference Nuremberg, Germany 27. March 2023
  2. European Commission aims to make the EU climate neutral by 2050 By 2030 - CO2 emissions should be reduced by at least 55 % compared to 1990 !
  3. mandatory reduction of
  4. Cement clinker • cement production contributes 7% of world wide CO2 emission mainly through decarbonation of limestone • 1 ton of cement clinker emits ~ 800 kg of CO2 • carbon dioxide emissions tax expected to double within next decade • currently ~ € 90,= per metric ton • no free quota from 2030 • carbon dioxide emissions tripled in last three decades to 3 billion tons /y. • cement production consumes most of natural resources
  5. Clinker production cement in making concrete world wide most abundant building material • quarrying, transport • grinding, preparation of raw materials • cooling, grinding, mixing Source:Chatham House
  6. Source:McKinsey Laying the foundation for zero-carbon cement
  7. actions • replacing clinker amount by SCM’s – fillers • using alternative binders like CSA cement or geopolymers • lowering cement amount by volume concrete, mortar • reduction concrete volume (3D-printing,GRC) • improving efficiency of binder system • re-use (concrete) scrap
  8. Hybride cements Replacement clinker amount by; • Limestone filler • GGBS • Calcined clay • Fly ash • Pozzolanic and others Standard in place EN-197-1 • CEM II/B-S • CEM II/A-LL • CEM II/B-V • CEM II/B-P
  9. cement standard calls for 2 day strength
  10. EN 197-1 - compressive strength Portland cement Portland limestone cement Portland slag cement Portland cement Portland limestone cement Portland slag cement Portland cement Portland limestone cement Portland slag cement CEM I 32,5 R CEM II A-LL 32,5 R CEM II B-S 32,5 N CEM I 42,5 R CEM II A-LL 42,5 R CEM II B-S 42,5 N CEM I 52,5 R CEM II A-LL 52,5 R CEM II B-S 52,5 N MPa MPa MPa MPa MPa MPa MPa MPa MPa 2 days ≥ 10 ≥ 10 - ≥ 20 ≥ 20 ≥ 10,0 ≥ 30,0 ≥ 30,0 ≥ 30,0 7 days > 16,0 28 days ≥ 32,5 ≥ 32,5 ≥ 32,5 ≥ 42,5 ≥ 42,5 ≥ 42,5 ≥ 52,5 ≥ 52,5 ≥ 52,5
  11. EN 197-1 - compressive strength Portland cement Portland limestone cement Portland slag cement Portland cement Portland limestone cement Portland slag cement Portland cement Portland limestone cement Portland slag cement CEM I 32,5 R CEM II A-LL 32,5 R CEM II B-S 32,5 N CEM I 42,5 R CEM II A-LL 42,5 R CEM II B-S 42,5 N CEM I 52,5 R CEM II A-LL 52,5 R CEM II B-S 52,5 N MPa MPa MPa MPa MPa MPa MPa MPa MPa 2 days ≥ 10 ≥ 10 - ≥ 20 ≥ 20 ≥ 10,0 ≥ 30,0 ≥ 30,0 ≥ 30,0 7 days > 16,0 28 days ≥ 32,5 ≥ 32,5 ≥ 32,5 ≥ 42,5 ≥ 42,5 ≥ 42,5 ≥ 52,5 ≥ 52,5 ≥ 52,5
  12. own carbon footprint availability of CEM I price interaction new binders with additives consistency low reactivity and slow hardening DRYMIX DRYMIX challenges
  13. requirements drymix • stable reactive binder • low carbon footprint • reduction binder content • fast setting • initial strength • compensation of shrinkage • low alkalinity • high density
  14. need to re-formulate requirements drymix • stable reactive binder • low carbon footprint • reduction binder content • fast setting • initial strength • compensation of shrinkage • low alkalinity • high density
  15. Low Carbon cement Portland cement blended with two other materials, e.g. ground limestone, GGBS, fly ash, silica fume, calcined clay, metakaolin etc. Ternary cement Quaternary Cement Portland cement blended with at least three other materials e.g. ground limestone, GGBS, fly ash, silica fume, calcined clay, metakaolin, gypsum, calcium aluminate etc. generally these binders are latent hydraulic and generate a lower initial strength modified to ensure a stable binder to overcome slow hydration and loss of early strength
  16. Quaternary Cement study of the effect of early hydration of ettringite on ternary mixtures • shortening of setting time • increase of early strength Amorphous Calcium Aluminate
  17. AFt (ettringite) 3CaO . Al2O3 . 2CaSO4 . 32H2O AFm (mono sulfo aluminate) 3CaO . Al2O3 . CaSO4 . 12H2O 4CaO . Al2O3 . 19H2O Solutions in the presence of lime, alumina, calcium sulfate complex hydrates are formed ; precipitation of ettringite
  18. Amorphous Calcium Aluminate Cement • one of the best precursors in forming AFt and AFm • ground to high surface area to further improve solubility and dissolution • hydration of main phase C12A7 reacts quickly with available sulphate to form ettringite and mono calcium aluminate; • account for high initial strength • high density • positive expansion, compensation of shrinkage • bound excess water accelerate drying Anhydrous Calcium Sulphate
  19. investigating the effect of percipitation of ettringite in different blends of OPC and SCM’s – and the effect on improving early strength and setting times materials used NHL 3,5 CEM I 52,5R GGBS META KAOLINE LIMESTONE FILLER PCE SCM
  20. reference GGBS Metakaolin CaCO3 CEM I 52,5R 23 NHL3,5 7 GGBS 55 CaCo3 15 PCE 0,15 CEM I 52,5R 23 NHL3,5 7 METAKAOLIN 55 CaCo3 15 PCE 0,15 CEM I 52,5R 23 NHL3,5 7 GGBS 15 CaCo3 55 PCE 0,15
  21. GGBS CEM I 52,5R 23 NHL 3,5 7 GGBS 50 CaCo3 12 ACA-XT-20 8 PCE 0,15 CEM I 52,5R 23 NHL 3,5 7 GGBS 54 CaCo3 12 ACA-XT-20 4 PCE 0,15 A B 0 0 1,5 1,27 2,19 2,8 2,16 2,53 3,17 0 0,5 1 1,5 2 2,5 3 3,5 REFERENCE A B MPa 6 hours 24 hours 72 hours 0 0 2,6 3,96 7,09 11,55 13,6 16 21,5 0 5 10 15 20 25 REFERENCE A B MPa 6 hours 24 hours 72 hours compressive strength flexural strength
  22. METAKAOLIN CEM I 52,5R 23 NHL 3,5 7 METAKAOLIN 50 CaCo3 12 ACA-XT-20 8 PCE 0,15 CEM I 52,5R 23 NHL 3,5 7 METAKAOLIN 54 CaCo3 12 ACA-XT-20 4 PCE 0,15 A B 0 0,8 1,65 0,9 1,83 3,36 3,14 2,8 3,93 0 0,5 1 1,5 2 2,5 3 3,5 4 4,5 REFERENCE A B MPa 6 hours 24 hours 72 hours flexural strength 0 0 2,6 3,96 7,09 11,55 13,6 16 21,5 0 5 10 15 20 25 REFERENCE A B MPa 6 hours 24 hours 72 hours compressive strength
  23. CaCo3 CEM I 52,5R 23 NHL 3,5 7 GGBS 12 CaCo3 50 ACA-XT-20 8 PCE 0,15 CEM I 52,5R 23 NHL 3,5 7 GGBS 12 CaCo3 54 ACA-XT-20 4 PCE 0,15 A B 0 0,51 1,2 1,04 2,01 2,83 2,56 2,94 3,87 0 0,5 1 1,5 2 2,5 3 3,5 4 4,5 REFERENCE A B MPa 6 hours 24 hours 72 hours flexural strength 0 1,07 3,02 2,95 5,32 9,1 7,49 10,71 15,49 0 2 4 6 8 10 12 14 16 18 REFERENCE A B MPa 6 hours 24 hours 72 hours compressive strength
  24. CEM I 52,5R 31 GGBS 15 CaCo3 54 XT_20 PCE 0,15 reference II leaving hydraulic calcium hydroxide out
  25. Portlandcement CEM I 52,5R 30 GGBS 12 CaCo3 50 ACA-XT-20 8 PCE 0,15 CEM I 52,5R 30 GGBS 12 CaCo3 54 ACA-XT-20 4 PCE 0,15 A B 0 0 1,5 1,27 2,19 2,8 2,16 2,53 3,17 0 0,5 1 1,5 2 2,5 3 3,5 REFERENCE A B MPa 6 hours 24 hours 72 hours flexural strength 0 0 2,6 3,96 7,09 11,55 13,6 16 21,5 0 5 10 15 20 25 REFERENCE A B MPa 6 hours 24 hours 72 hours compressive strength
  26. • it is shown that an addition of amorphous calcium aluminate XT-20 has a significant impact on the early strength development of all binders systems tested • optimum dossage of Amorphous Calcium Aluminate XT-20 is ~ 8% by weight • XRD-testing confirms that it is in line with the amount of ettringite being formed • shortening of the setting time in all cases ; 20 ~ 40 minutes begin / final set of 30 ~50 minutes • use of super plasticizing agent helped to keep water/binder ratio • results show that formation of early ettringite improved the early strength independently of other constituents in conclusion
  27. • hydraulic lime should have a positive effect on the percipation of ettringite, shown is the effect is negligible • calcium carbonate forms hemicarboaluminate, stabilize ettringite • higher limestone addition contributed to early strength development, filler effect • higher amount of amorphous calcium aluminate XT-20 will increase strength development / accelerate setting
  28. • efficient low carbon binder system • reduced use of Portland cement • lower over all binder percentage • allows considerable replacement • indifferent of type and amount of SCM’s • guaranteed fast set and hardening • improves early strength Amorphous Calcium Aluminate Cement stable “fast set low carbon binder”
  29. last note further studies are being done to investigate the effect on other low carbon/cement free hydraulic binder systems more results will be presented next hope to meet you all there
Publicidad