by Page Contents
1. Mix stipulation for ingredients of concrete
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- Grade of Concrete : M60
- Type of Cement : OPC 53 grade confirming to IS 269
- Maximum Nominal Size Aggregate : 20 mm
- Minimum Cement content : 400Kg/cum
- Maximum Water- Cement Ratio : 0.4
- Workability : 150 ± 25 mm (slump)
- Exposure Condition : Moderate for RCC
- Method of Concrete Placing : Pumping or Bucket
- Degree of Supervision : Good
- Type of Aggregate : Crushed angular Aggregate
- Chemical admixture type : Super plasticizers Confirming IS 9103:1999
2. Material Properties
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- Cement : Ultratech OPC 53 grade confirming to IS 269
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- Specific Gravity of cement : 3.15
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- Cement : Ultratech OPC 53 grade confirming to IS 269
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- Chemical Admixture : FOSROC Auramix 400
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- Specific Gravity of Admixture : 1.096
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- Chemical Admixture : FOSROC Auramix 400
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- Specific Gravity
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- Coarse aggregate
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- 20mm : 2.66
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- 12.5mm : 2.64
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- Ratio of aggregate: 20mm-10% & 12.5mm-90%
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- Coarse aggregate
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- Fine aggregate
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- Crushed stone aggregate : 2.59
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- Fine aggregate
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- Water: 1
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- Specific Gravity
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- Water Absorption
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- Coarse aggregate
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- 20mm : 0.29%
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- 12.5mm : 0.36%
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- Coarse aggregate
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- Fine aggregate
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- Crushed stone aggregate : 2.88%
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- Fine aggregate
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- Free Surface Moisture
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- Fine aggregate : Nil
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- Coarse aggregate: Nil
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- Free Surface Moisture
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- Sieve Analysis
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- Coarse aggregate:
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- Sieve Analysis
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- Water Absorption
| IS Seive Sizes | % Passing | IS Requirement as per IS 383 Table 7 | Ratio | Combined 100% | Confirming to IS 383 table 7 | ||||||
| Single Sized | Graded | 10% | 90% | ||||||||
| 20 mm | 12.5 mm | 20 mm | 12.5 mm | 12.5 mm | 20 mm | 12.5 mm | |||||
| 20 | 91.93 | 100 | 85-100 | 100 | 100 | 9.19 | 90.00 | 99.19 | 90-100 | ||
| 12.5 | 0 | 98.78 | – | 85-100 | 90-100 | 0.00 | 88.90 | 88.90 | – | ||
| 10 | 0.44 | 52.08 | 0-20 | 0 – 45 | 40 – 85 | 0.04 | 46.87 | 46.92 | 25-55 | ||
| 4.75 | 0.2 | 0.64 | 0-5 | 0-10 | 0 – 10 | 0.02 | 0.576 | 0.60 | 0-10 | ||
| PAN | 0 | 0 | – | – | – | 0 | 0 | 0.00 | |||
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- Fine Aggregate: Confirming to grading Zone II of table 4 of IS 383 ,Note:- as per field trials for pumpable concrete fine aggregate should pass zone II; According to IS 383 clause No. 31.2.2 allows to use crushed stone sand as fine aggregate for concrete .According to IS 383-2016 for crushed stone sand, the permissible limit on 150 micron IS sieve is increased to 20%.
| IS Seive Sizes | % Passing | Specification | ||
| C Sand | IS 383 Zone II | |||
| 4.75 | 100 | 90-100 | ||
| 2.36 | 94.17 | 75-100 | ||
| 1.18 | 66.34 | 55-90 | ||
| 600 | 47.31 | 35-59 | ||
| 300 | 27.38 | 8-30 | ||
| 150 | 11.22 | 0-20 | ||
| IS Seive Sizes | 100% | 100% | 100% | 5.3% | 47.7% | 47% | Combined Passing | Specification |
| 20mm | 12.5mm | C Sand | 20mm | 12.5mm | C Sand | min-max | ||
| 40 | 100 | 100 | 100 | 5.3 | 47.7 | 47.00 | 100 | 100-100 |
| 20 | 91.93 | 100 | 100 | 4.87 | 47.7 | 47.00 | 99.57 | 95-100 |
| 4.75 | 0 | 0.64 | 100 | 0 | 0.31 | 47.00 | 47.31 | 30-50 |
| 0.6 | 0 | 0 | 47.31 | 0 | 0 | 22.24 | 22.24 | 10-35 |
| 0.15 | 0 | 0 | 11.22 | 0 | 0 | 5.2734 | 5.27 | 0-6 |
3. Target Mean Strength and Mix Proportioning
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- As per MORTH the Target Mean Strength for M-60 Grade = 73Mpa
4. Target Mean Strength and Mix Proportioning
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- As per technical specification max Water/Cement + Binder = 0.4
5. Selection of water/Cement Ratio (W/C)
Ref Tab 2 , IS 10262 , Maximum water content per cum for 20mm Aggregate = 186 litre for 50 mm slump
= 186 + (0.12 * 186) (add 3% for every 25 mm increase )
= 208.32 lit
Based on trials with super plasticizers, water content reduced by 15%,hence the arrived water content = 177.07lit, So Let us add water 177 lit
6. Cementious content Calculation
Water-Cementitious Ratio = 0.33
Cementious content (Cement OPC 53 + GGBFS) = 536
Say Cementitious content = 540 kg/m3
Cement = 390 kg/m3
Based on experience and lab trials, GGBS =150kg/m3 (Taking GGBS 27.77%)
Based on experience and lab trials, Based on experience and lab trials, super plasticizer = 0.67 %
7. Calculation Aggregate content Calculation
Ref Tab 3 of IS 10262 , for Sand Zone II , volume of coarse aggregate
per unit vol of total aggregate for 0.5 water-cement ratio = 0.62
Adjust for W/c ratio : Add @ 0.01 for every decrease in 0.05= 0.034
Therefore , corrected proportion = 0.654
Adjust for pumpability , i.e decrese by 10% = 0.59 %
Based on experience Considering Volume of coarse aggregate = 0.53
Therefore, Volume of Fine aggregate = 0.47
8. Mix volume Calculation per cubic meter of concrete
a) Volume of concrete = 1 m3 b) Volume of cement = (Mass of cement /specific gravity of cement) × 1000 =390/(3.15×1000)= 0.124 m3 c) Volume of GGBFS=(Mass of GGBFS/specific gravity of GGBFS )× 1000=(150/2.91)x1000=0.0515 d) Volume of water = (Mass of water /specific gravity of water)× 1000 = 0.177 m3 e) Volume of admixture = (Mass of admixture /specific gravity of admixture)× 1000 = (540×0.67)/(100×1.096×1000)=0.0033 m3 f) Volume of all in aggregate =[a-(b+c+d+e)] =1-(0.124+0.0515+0.177+0.0033)=0.6442= Say 0.644 m3 g) Mass of coarse aggregate(CA) 1) 20 mm = f × volume of CA × sp. gravity × % of 20mm × 1000 = 0.644*0.53*2.66*0.1*1000= 90.791 kg/m3, Say 91 kg/m3 2) 12 mm = f× volume of CA × sp. gravity × % of 12mm × 1000 = 0.644*0.53*2.64*0.9*1000 = 810.976 kg/m3, Say 811 kg/m3 g) Mass of Fine aggregate = f × volume of FA × sp. gravity × 1000 0.644*0.47*2.59*1000 = 783.941 kg/m3 Say 784 kg/m39. Details of Mix Design
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- cement = 390 kg
- GGBFS =150 kg
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- 20mm = 91 kg
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- 12mm = 811 kg
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- Crushed stone sand = 784 kg
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- Chemical admixture = 3.62 kg
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- Free Water = 177 kg
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- Water-Cement Ratio = 0.33
- Concrete density = 2406 kg/m3
