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Concrete Mix D esign using Modern B inder M aterials

DSE4 Final Year Project 2011/12. Concrete Mix D esign using Modern B inder M aterials. Brendan Cronin. Project Supervisor: Ted McKenna. The aim of this project is to develop mix design methods for modern day binder types. Objectives.

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Concrete Mix D esign using Modern B inder M aterials

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  1. DSE4 Final Year Project 2011/12 Concrete Mix Design using Modern Binder Materials Brendan Cronin Project Supervisor: Ted McKenna

  2. The aim of this project is to develop mix design methods for modern day binder types

  3. Objectives • Microsoft Excel based software solution for Concrete Mix Design • Comparison to the BRE design method for normal concrete mixes • Integrate the Wang and Ai formula • Compare and contrast the specification of a Total water content vs. a Free-water content

  4. Modern Binders • Common concrete mix design guide • BRE Design of Normal Concrete Mixes • Based on Ordinary Portland Cement (CEM I) • Popular Modern Binders • More Sustainable • Better for the environment • CEM II/A-L – Portland-Limestone Cement • CEM III/A – Blastfurnace Cement (50% GGBS)

  5. Approach to Concrete Mix Design

  6. Approach to Concrete Mix Design

  7. The Saturated Surface Dry Condition of Aggregates • Aggregates required to be in a SSD condition • Visual and physical inspection • IS EN 1907-6 Water Absorption of aggregates • IS EN 1907-5 Moisture Content of aggregates

  8. Proportions of Aggregate Step 1: Grading • Particle size distribution tests – IS EN 933-1 (Sieve Analyses) • Grading limits – IS EN 12620

  9. Proportions of Aggregate Step 1: Grading

  10. Proportions of Aggregate Step 1: Grading

  11. Proportions of Aggregate Step 1: Grading

  12. Proportions of Aggregate Step 1: Grading

  13. Proportions of Aggregate Step 1: Grading

  14. Proportions of Aggregate • Combined grading curve • Compliance with industry standards

  15. Proportions of Aggregate Roadstone Wood Limits

  16. Proportions of Aggregate CEMEX Limits

  17. Proportions of Aggregate Norman Palliser Limits

  18. Proportions of Aggregate Norman Palliser Limits – Adjust curve to fit

  19. Proportions of Aggregate Adjust curve to fit

  20. Proportions of Aggregate Adjust curve to fit

  21. Proportions of Aggregate Adjust curve to fit

  22. Proportions of Aggregate Adjust curve to fit

  23. Proportions of Aggregate Adjust curve to fit

  24. Concrete Mix Design Spreadsheet

  25. Concrete Mix Design Spreadsheet

  26. Concrete Mix Design Spreadsheet

  27. Concrete Mix Design Spreadsheet

  28. Concrete Mix Design Spreadsheet

  29. Concrete Mix Design Spreadsheet

  30. Concrete Mix Design Spreadsheet

  31. Concrete Mix Design Spreadsheet

  32. Concrete Mix Design Spreadsheet

  33. Experimental Regime • Relationship between compressive strength of concrete and the free-water cement ratio. (BRE) • Applicable to modern binders?

  34. Experimental Regime • Relationship between compressive strength of concrete and the free-water cement ratio. (BRE) • Applicable to modern binders? • Replicate for CEM II/A-L and CEM III/A. • Focus on shaded area.

  35. Experimental Regime

  36. Experimental Regime • 18 Different Concrete Mixes • Produced 180 Concrete Cubes • Tested for: • Slump • Wet Density • 7 & 28 Day Compressive Strength Tests

  37. Compressive Strength Test Results

  38. Comparison with the BRE

  39. The Wang & Ai Formulae Sand-aggregate Proportion Where: C is the cement content per m3 of concrete ρC is the density of cement (kg/m3) W is the water content (10-3 kg)

  40. The Wang & Ai Formulae Sand-aggregate Proportion

  41. The Wang & Ai Formulae Water Content Equation Where: T is the slump (cm) W is the required water content (x 10-3 kg/m3)

  42. The Wang & Ai Formulae Water Content Equation

  43. Conclusions and Recommendations • The software solution simplifies the concrete mix design process and is accurate to within a margin of ± 4 MPa. • The Wang & Ai formula for aggregate proportions proves useful, however, the formula for water content proves inconclusive for the tested binders. • The results of the compressive strength tests show that the modern binders perform differently to the OPC, as used in the BRE, when plotted against the water/cement ratio. Recommend further suite of testing to substantiate this. • Including total water content with the specification of a concrete mix is not appropriate unless the aggregates and their proportions are constant.

  44. Thank you for listening. Any Questions?

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