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Properties of aggregrate
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Aggregate - Concrete Technology

Lesson: Concrete Technology - Building Materials
The quality of aggregate affect the durability and strength of concrete. Since about 3/4 of the volume of concrete is occupied by aggregate.

Aggregate - Concrete Technology

  1. 1. AGGREGATE DAVID GRUBBA
  2. 2. Theory
  3. 3. Aggregate Theory 2. Types of Aggregates 1. Introduction
  4. 4. 1 Introduction
  5. 5. Water Cement Sand* Mortar Gravel** CONCRETE STEEL REINFORCED CONCRETE Aggregate Mortar ≠ Concrete ≠ Reinforced Concrete * Fine aggregate ** Coarse aggregate
  6. 6. AGGREGATE Aggregates
  7. 7. MORTAR
  8. 8. BALLAST (RAILROADS)
  9. 9. 2 Types
  10. 10. How is it made: Crushed Stone
  11. 11. Stone Drilling Blasting (explosives) Load the stone Transport Primary Crusher Secondary Crusher Tertiary Crusher Screening Different Sizes Product Handling
  12. 12. Production (Photos) Explosive Primary Crusher First reduction in size Secondary Crusher Crushed Stone Conveyor Belts
  13. 13. Load of stone
  14. 14. Dump Truck
  15. 15. First reduction in size
  16. 16. Different Sizes of Crushed Stone Photo: Mineração Santiago
  17. 17. Different Sizes of Crushed Stone Photo: Mineração Santiago
  18. 18. Different Sizes of Crushed Stone Photo: Mineração Santiago
  19. 19. Different Sizes of Crushed Stone Photo: Mineração Santiago
  20. 20. Sand
  21. 21. Expanded Clay
  22. 22. Common Tests
  23. 23. Aggregate Properties (Tests) 1. Size Classification 2. Shape Classification 3. Hardness (Los Angeles Test) 4. Moisture Content 5. Bulking of sand
  24. 24. 1 Size Classification
  25. 25. Aggregate: Sieves
  26. 26. Granulometry is the measurement of the size distribution in a collection of grains
  27. 27. Poorly Graded aggregate Well-graded aggregate Different concretes Which is cheaper? The coloured areas represent Portland Cement Water Past
  28. 28. Photos
  29. 29. 2,85 g 85,58 g 240,04 g 231,11 g 247,20 g 20,25 g 49,34 g 123,63 g
  30. 30. Example of sieve analysis Sieve size (mm) Mass retained (g) Percentage retained Cumulative Percentage retained Cumulative Percentage passing
  31. 31. Sieve Percentage Retained Cumulative Percentage Retained 4,8 0 % 0% 2,4 0 % 0 % 1,2 0 % 0 % 0,6 40 % 40 % 0,3 30% 70 % 0,15 30% 100 % Sum 210 FM 2,1 Fineness Modulus Fineness Modulus (FM): defined as the sum of the cumulative percentages retained on the sieves of the standard series, divided by 100. Sieve Percentage Retained Cumulative Percentage Retained 4,8 20 % 20 % 2,4 30 % 50 % 1,2 50% 100 % 0,6 0 % 100 % 0,3 0 % 100 % 0,15 0% 100 % Sum 470 FM 4,7 Example (Aggregate 2):Example (Aggregate 1):
  32. 32. 2 Shape Classification
  33. 33. Rounded Angular Flaky Shape Completely shaped by attrition Possessing well-defined edges Aggregate of which the thickness is small relative to the other two dimensions
  34. 34. To make concrete, which is better: Rounded or Flaky aggregate
  35. 35. Photo: Cimentos Itambé FlakyRounded
  36. 36. 3 Hardness Los Angeles Test
  37. 37. Sample of Aggregate Steel balls Retained Sieve Broken material Los Angeles Test RESULT: The proportion of broken material, expressed as a percentage
  38. 38. 4 Moisture Content
  39. 39. Moisture Content MC = W- D x 100% W W = wet weight D = weight after drying The are various methods for measuring the moisture content of aggregate
  40. 40. 5 Bulking of Sand
  41. 41. Bulking of sand Dry W = 3% W = 6%
  42. 42. The End
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Lesson: Concrete Technology - Building Materials The quality of aggregate affect the durability and strength of concrete. Since about 3/4 of the volume of concrete is occupied by aggregate.

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