M60 Concrete Mix Design with OPC cement and GGBS

1. Mix stipulation for the ingredients of concrete

• • 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: Superplasticisers, confirming IS 9103:1999

2. Material Properties

• • cement = 390 kg
  • GGBFS =150 kg

• • 20mm = 91 kg

• • 12mm = 811 kg

• • Crushed stone sand = 784 kg

• • Chemical admixture = 3.62 kg

• • Free Water = 177 kg

• • Water-Cement Ratio = 0.33

• Concrete density = 2406 kg/m3

• • JSW-GGBFS Confirming to IS 12089
    • Specific Gravity of GGBFS: 2.91
  • Chemical Admixture: FOSROC Auramix 400
    • • Specific Gravity of Admixture: 1.096

• • Specific Gravity
    • • Coarse aggregate
        • • 20mm: 2.66
        • • 12.5mm: 2.64
        • • Ratio of aggregate: 20mm-10% & 12.5mm-90%

    • • Fine aggregate
        • •   Crushed stone aggregate: 2.59

    • • Water: 1

• • Water Absorption
    • • Coarse aggregate
        • • 20mm: 0.29%
        • • 12.5mm: 0.36%

    • • Fine aggregate
        • •   Crushed stone aggregate: 2.88%

    • • Free Surface Moisture
        • • Fine aggregate: Nil
        • • Coarse aggregate: Nil

    • • Sieve Analysis
        • • Coarse aggregate:

• • 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, it allows the use of crushed stone sand as fine aggregate for concrete. According to IS 383-2016 for crushed stone sand, the permeassible limit on 150 micron IS sieve is increased to20%.

All in aggregate:

3. Target Mean Strength and Mix Proportioning

• • As per MORTH the Target Mean Strength for M-60 Grade = 73Mpa

4. Target Mean Strength and Mix Proportioning

• • As per technical specification max Water/Cement + Binder = 0.4

5. Selection of water/Cement Ratio (W/C)

6. Cementious content Calculation

7. Calculation Aggregate content Calculation

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/m3

9. Details of Mix Design

• • cement = 390 kg
  • GGBFS =150 kg

• • 20mm = 91 kg

• • 12mm = 811 kg

• • Crushed stone sand = 784 kg

• • Chemical admixture = 3.62 kg

• • Free Water = 177 kg

• • Water-Cement Ratio = 0.33

• Concrete density = 2406 kg/m3