Mix Design with 20mm Down Aggregates

2009-10 REPORT ON MIX DESIGN M-10 (20 mm down) with 38. 5% FA FIELD QUALITY ASSURANCE DEPT Mix Design for M-10 Grade of Concrete 1) Design Stipulation – a) Characteristic compressive strength required in the field at 28 days b) c) Maximum size of aggregate Degree of workability – 10 N/mm2 – 20 mm – 75 – 125 mm – Good – Moderate – 2% d) Degree of Quality e) f) Type of Exposure Entrapped Air content (max 20 mm) 2) Test Data for Materials – A) CEMENT a) Cement – Shree Ultra OPC 43 grade b) Specific Gravity – 3.

15 B) AGGREGATE – Sieve Size 1. Impact Value 1. % Water Absorption 2. Specific Gravity 3. Silt Content 4.

Flakiness Index 5 Fineness Modulus 20 mm 10 mm MECHANICAL PROPERTIES 17. 33 % NA PHYSICAL PROPERTIES 0. 21 0. 33 2. 7 2. 69 NA NA 14. 01 % 16. 12 % NA NA Sand NA 1. 06 2. 64 3. 08 NA 3. 12 C) ADMIXTURE – Fosroc Conplast SP 430 3) Target Mean Strength of Concrete – (As per IS -10262) The target mean strength of concrete for M-10 Grade = 14 N/mm2 Page 2 4) Water Cement Ratio (W/C) – a) Corresponding to TMS b) Corresponding to Exposure Condition (IS 456-2000 table no. 5) So, Water Cement Ratio = 0.

6 Fine aggregate as % of total aggregate by weight – 45 % (after trials) 5) Individual Aggregate Gradation – (As per IS 383-1970) Sieve size in MM 0. 7 – 0. 6 20 MM % Passing 1 100 95. 62 2 100 94. 3 3 4 Avg Limit 100 100 100 100 96. 71 94. 15 95. 2 85-100 7. 98 0. 7 12. 33 10. 5 0. 88 0. 9 0-20 0-5 1 100 100 98. 86 9. 86 2. 36 2 100 98. 2 92. 64 11. 89 2. 46 3 10 MM % Passing 4 Avg 100 98. 65 91. 8 10. 3 2. 5 Limit 100 100 85-100 0-20 0-5 25 20 12. 5 10 4. 75 2. 36 10. 51 11. 12 0. 94 1. 05 100 100 96. 4 100 91. 2 92. 66 8. 96 10. 28 3. 32 1. 98 Sieve size in MM SAND 1 100 91. 81 80. 65 74. 14 41. 3 15. 81 5. 49 0. 2 2 3 100 100 92. 64 91. 63 82. 38 83. 66 64. 68 71. 9 40. 62 43. 4 18. 48 13. 3 5. 96 4. 72 0. 14 0. 18 % Passing 4 5 Avg 99. 8 99. 76 99. 89 91. 45 95. 45 95. 45 83. 6 87. 5 83. 6 70. 36 70. 94 70. 4 39. 85 40. 75 41. 2 17. 9 15. 91 16. 3 5. 42 3. 41 5. 4 0. 6 0. 8 0. 38 Limit 100 90-100 75-100 55-90 35-59 8-30 0-10 10 4. 75 2. 36 1. 18 0. 6 0. 3 0. 15 0. 075 – FIELD QUALITY ASSURANCE DEPT Page 3 7) All In Aggregate Grading of CA & FA for Concrete Mix Design – Sieve size in MM % Passing 33 % 20 MM 33 31. 42 0 3. 465 0. 297 0 0 0 0 0 0 22 % 10 MM 22 22 21. 7 20. 2 2. 3 0. 55 0 0 0 0 0 45 % SAND 45 45 45 44. 95 41. 67 37. 62 31. 68 18. 54 7. 33 2. 43 0. 171 Combined Grading 100 98. 42 66. 71 68. 61 44. 26 38. 17 31. 68 18. 4 7. 33 2. 43 0. 171 Limits (IS 383) 100 95-100 40 20 12. 5 10 4. 75 2. 36 1. 18 0. 6 0. 3 0. 15 0. 075 30-50 10 -35 0-6 Note – The above mix proportion is subjected to change if individual gradation of aggregate varies, To achieve specified limits.

All IN AGGREGATE GRADING FIELD QUALITY ASSURANCE DEPT Page 4 8) Water & Cement Content Cementitious Material – 260 Kg W/C – 0. 6 Water – 156 Kg 9) Determination of Coarse & Fine Aggregate content – Maximum size of CA = 20 mm Entrapped Air Content – 2% (As per IS 10262) CA = 1100 Kg & FA = 880 Kg CA I (20 mm) – 660 Kg CA II (10 mm) – 440 Kg Sand – 880 Kg 0) Mix Proportion of 1 cum Concrete (SSD) ? ? ? ? ? ? ? Cementitious Material Cement Fly Ash Water CA I (20 mm) CA II (10 mm) Sand – 260 Kg – 160 Kg – 100 Kg – 156 Kg – 660 Kg – 440 Kg – 880 Kg 11) Final Dry Quantities – a) Cementitious Material = 260 Kg b) Water = Extra water to be added for water absorption in the case of dry aggregate. Sieve Size (mm) CA I (20 mm) CA II (10 mm) sand % water Absorption 0. 21 0. 33 1. 06 Total Extra Water Extra Water (Kg) 1. 39 1. 45 9. 33 12. 17 Kg FIELD QUALITY ASSURANCE DEPT Page 5 c) Aggregate CA I (20 mm) – 658. 61 Kg CA II (10 mm) – 438. 5 Kg Sand – 870. 67 Kg 12) Mix Proportion of 1 cum Concrete (Dry Weight) ? ? ? ? ? ? ? Cementitious Material Cement Fly Ash Water CA I (20 mm) CA II (10 mm) Sand – 260 Kg – 160 Kg – 100 Kg (38. 5 % ) – 168. 17 Kg – 658. 61Kg – 438. 55 Kg – 870. 67 Results Summary: After trials the mix found suitable by workability and test results (7 days & 28 Days) Date of test Admixture Dose (% by wt of Binder) Fosroc Conplast SP 430 Slump (mm) Initial After 30 Min After 60 Min After 90 Min 170 140 100 17. 03. 09 1% Compressive Strength of Concrete Cubes in N/mm2 Sr.

No 1 2 3 4 5 6 7 8 9 Date of Casting Date of Testing Weight (Kg) 8098 8202 8110 8218 8012 8150 8386 8360 8416 Load (KN) 470 440 440 520 500 520 520 500 470 7 Days Strength (N/mm2) 20. 89 19. 56 19. 56 23. 11 22. 22 23. 11 23. 11 22. 22 20. 83 Avg 7 Days Strength (N/mm2) 17. 03. 09 24. 03. 09 21. 73 FIELD QUALITY ASSURANCE DEPT Page 6 Compressive Strength of Concrete Cubes in N/mm2 by Accelerated Curing Method (As per I. S 9013) Date of Casting Date of Testing Weight (Kg) 8158 8294 8168 8330 8308 8328 Load (KN) 220 260 220 260 260 240 Accelerated Curing Strength (N/mm2) 9. 78 11. 56 9. 78 11. 56 11. 56 10. 7 Projected 28 Days Strength (N/mm2) 24. 13 27. 04 24. 13 27. 04 27. 04 25. 59 Projected Avg. 28 Days Strength (N/mm2) Sr. No 1 2 3 4 5 6 25. 03. 09 26. 03. 09 25. 83 Note – 1) Mixes recommended shall be first used for initial period of 2/3 Weeks or sufficient quantity of concrete is poured in. When system is well established and results of standard deviation show minimum deviations, mixes shall be further optimized / modified, if found necessary. 2) For mixes with flyash, strengths achieved are much higher than those without flyash. With addition of flyash, either water cement ratios are reduced or require lower dosages of admixture.