Project on Concrete Mix Design for various grades of Concrete
Mix Design for M35 grade concrete with Fly ash as partial replacement
| Grade of concrete | 35 | Mpa |
| Type of cement | OPC | |
| Type of Mineral admixture | Fly ash | |
| Maximum nominal size of aggregate | 20 | mm |
| Exposure conditions | Moderate | |
| Workability(slump) | 120 | mm |
| Method of placing concrete | Pumping | |
| Chemical admixture | Superplasticiser | |
| Target strength | fck'= fck + 1.65S | |
| = 35+1.65(5) | ||
| 43.25 | Mpa | |
| where, | ||
| f'ck= target compressive strength | ||
| fck= characteristic stremgth | ||
| S= Standard deviation | ||
| X= factor based on grade of concrete | ||
| Selection of water-cement ratio | ||
| max w/c ratio for given target strength | 0.4 | From the graph in IS 10262 |
| Selection of water content | ||
| water content | 186 | kgs(for 50mm slump)s |
| From Table 4 | ||
| Estimated water content for | 120 | mm Slump |
| increasing 3% water for every 25mm slump | ||
| 186+(8.4/100)X186 | ||
| = | 201.62 | kg |
| There is a use of superplasticizer | Hence, | Reduction of 23% of water is permitted |
| for addition of SP 1% of cement by weight. | ||
| 155.2474 | kg | |
| Calculationof cement Content | ||
| Water cement ratio | 0.4 | |
| cement content | =155/0.4 | |
| 387.5 | kg/m3 | |
| Cementitious material | 387.5*1.1 | |
| 426.25 | kg | |
| Water | 155 | kg |
| 155/426 | ||
| W/C | 0.36385 | |
| Fly ash | @30% | of total cememtitious material |
| 426X0.3 | ||
| 127.8 | kg/m3 | |
| Cement | 259.7 | kg/m3 |
| Proportion of volume of Course Aggre Fine aggre | ||
| From table 5 | ||
| for 20mm nominal size CA | ||
| Vol of CA per unit Vol of Total Aggre | ||
| 0.62 | ||
| MIX CALCULATIONS | ||
| Total volume | 1 | m3 |
| Volume of cement | (mass of cement/Sp gravity of cement)/1000 | |
| 0.082444 | m3 | |
| Volume of flyash | (mass of flyash/Sp gravity of flyash)/1000 | |
| 0.058091 | m3 | |
| Volume of water | (mass of water/sp gravity of water)/1000 | |
| 0.155 | m3 | |
| Volume of plasticiser | (mass of plasticizer/sp gravity of plasticizer)/1000 | |
| 0.002268 | m3 | |
| Volume of entrapped air | 0.01 | m3 |
| volume of all in aggregate | a-b--c-d-e | |
| 0.692197 | m3 | |
| Mass of course aggregate | vol of CA × Sp gravity of CA × 1 000 | |
| 1137.279 | ||
| Mass of Fine aggregate | vol of FA × Sp gravity of FA × 1 000 | |
| 697.0419 | ||
| Mix proportion | ||
| Cement | 259.7 | kg/m3 |
| Flyash | 127.8 | kg/m3 |
| Water | 155.0 | kg/m3 |
| Fine aggregate | 697.0 | kg/m3 |
| Coarse aggregate | 1137.3 | kg/m3 |
| Plasticizer | 2.6 | kg/m3 |
| Free water-Cementitios materials ratio | 0.4 | |
M50 grade concrete without Fly ash
| Grade of concrete | 50 | Mpa |
| Type of cement | OPC | |
| Type of Mineral admixture | NA | |
| Maximum nominal size of aggregate | 20 | mm |
| Exposure conditions | Moderate | |
| Workability(slump) | 120 | mm |
| Method of placing concrete | Pumping | |
| Chemical admixture | Superplasticiser | |
| Target strength | fck'= fck + 1.65S | |
| = 50+1.65(5) | ||
| 58.25 | Mpa | |
| where, | ||
| f'ck= target compressive strength | ||
| fck= characteristic stremgth | ||
| S= Standard deviation | ||
| X= factor based on grade of concrete | ||
| Selection of water-cement ratio | ||
| max w/c ratio for given target strength | 0.33 | From the graph in IS 10262 |
| Selection of water content | ||
| water content | 186 | kgs(for 50mm slump)s |
| From Table 4 | ||
| Estimated water content for | 120 | mm Slump |
| increasing 3% water for every 25mm slump | ||
| 186+(8.4/100)X186 | ||
| = | 201.62 | kg |
| There is a use of superplasticizer | Hence, | Reduction of 23% of water is permitted |
| for addition of SP 1% of cement by weight. | ||
| 155.2474 | kg | |
| Calculationof cement Content | ||
| Water cement ratio | 0.33 | |
| cement content | =155/0.33 | |
| 469.697 | kg/m3 | |
| Cementitious material | 469.69*1.1 | |
| 516.6667 | kg | |
| Water | 155 | kg |
| 155/516 | ||
| W/C | 0.3 | |
| Proportion of volume of Course Aggre Fine aggre | ||
| From table 5 | ||
| for 20mm nominal size CA | ||
| Vol of CA per unit Vol of Total Aggre | ||
| 0.62 | ||
| MIX CALCULATIONS | ||
| Total volume | 1 | m3 |
| Volume of cement | (mass of cement/Sp gravity of cement)/1000 | |
| 0.14911 | m3 | |
| Volume of water | (mass of water/sp gravity of water)/1000 | |
| 0.155 | m3 | |
| Volume of plasticiser | (mass of plasticizer/sp gravity of plasticizer)/1000 | |
| 0.004512 | m3 | |
| The volume of entrapped air | 0.01 | m3 |
| the volume of all in aggregate | a-b--c-d-e | |
| 0.681377 | m3 | |
| Mass of course aggregate | vol of CA × Sp gravity of CA × 1 000 | |
| 1119.503 | ||
| Mass of Fine aggregate | vol of FA × Sp gravity of FA × 1 000 | |
| 686.1471 | ||
| Mix proportion | ||
| Cement | 469.7 | kg/m3 |
| Water | 155.0 | kg/m3 |
| Fine aggregate | 686.1 | kg/m3 |
| Coarse aggregate | 1119.5 | kg/m3 |
| Plasticizer | 4.7 | kg/m3 |
| Free water-Cementitious materials ratio | 0.3 | |