Project on Concrete Mix Design for various grades of Concrete
(A)Calculate the Concrete Mix Design for M35 grade concrete with fly ash:
Mix proportion of M35 Grade using fly Ash
(1) Details :
- Type of cement = OPC (43 Grade)
- Mineral Admixture = Fly ash confirmation (IS 3812: part 1)
- Maximum size of Aggregate = 20mm
- Cement Content = 340 (Kg/m3)
- Maximum Water content = 0.45
- Workability = 75mm to 100 mm
- Exposure Condition = Very Severe
- Method of concrete = pumping
- Degree of supervision = Good
- Type of aggregate = crushed anguler Aggrgate
- Maximum Cement content = w/c = 0.45
- = 186/0.45 = 413 kg/m3
- Chemical Admixture = Super plasticiser
(2) Data for Material :
- Cement : OPC 43 Grade IS 8112
- Specific Gravity of cement : 3.15
- Chemical Admixture : Super plasticiser Confirmation (IS 9103)
- Specific Gravity of Coarse aggrgate : 2.74
- Specific Gravity of Fine aggregate : 2.74
- Water Absorbtion of caorse aggregate: 0.5%
- Water Absorbtion of Fine aggregate: 1%
- free surface moisture fine aggregate: nil
- free surface moisture coarse aggregate: nil
- sieve analysis: 20mm (zone I) (Table 2, IS 383)
- fine aggregate (zone I) (Table 4,IS 383)
(3) Target Mean Strength:
Target Mean Strength Ft = Fck + 1.65 S
- Fck - Characteristic compressive strength
- S - Standard Deviation Factor
Ft= Fck + 1.65 S
= 35 + 1.65 * 5
= 35 + 8.25
Ft=43.25 N/mm2
(4)Water Cement ratio:
water cement ratio :0.45 (IS 456: 2000, Table 5)
water cement ration :0.33 (IS 10292 : 1982 , fig 1)
hence , o.33 < 0.45 , Ok
(5) Selection of water content :
(IS 10262 :2009, Table :2)
For 20mm aggregate : 186 litre
water content=186 litres + (6/100) * 186
= 197 litre* 0.71 (29 % for super plasticiser)
= 140 litre
(6)Selection of Cement content:
water cement ratio= 0.45
W/C= 0.45
140/0.45 = cement
140/342= 0.4
cement content = 311 kg/m3*1.10 =342 kg/m3
Fly ash (30%) cementenious Material= 342* 30%=102 kg/m3
Cement content : 342-102=240 kg/m3
Fly ash being utalized =100 kg/m3
Hence , 240 kg/m3
(7)Proportion of Aggregate :
0.5 = 0.6 (table 3, 20mm aggregate)
w/c =0.45 (2 % of increase aggregate)
0.45= 0.62
Pumpable concrete (reduction of 10%)
Coarse aggregate : 0.62*0.9 = 0.56
Volume of fine aggregate = 1-0.56=0.44
(8) Mix Calculation :
(a) Volume of aggrgate : 1m3
(b) volume of cement : (Mass of cement/specific gravity of cement) * (1/1000)
: (218/3.14) *(1/1000)
:0.069 m3
(c) Volume of water :(Mass of water/specific gravity of water) * (1/1000)
: (140/1) *(1/1000)
:0.140 m3
(d) Volume of Admixture:(Mass of admixture/specific gravity of admixture) * (1/1000)
: (7/1.145) *(1/1000)
:0.006 m3
(e) Volume of fly ash:(Mass of Fly ash/specific gravity of fly ash) * (1/1000)
: (102/1) *(1/1000)
:0.102 m3
(f) Volume of aggregate :[(a-(b+c+d+e)]
:[ (1-(0.069+0.140+0.006+0.102)]
:0.683m3
(g)Mass of Coarse aggregate: e* volume of aggregate*specific gravity of aggregate*1000
:0.683*0.56*2.74*1000
:1047 Kg
(g)Mass of fine aggregate: e* volume of aggregate*specific gravity of aggregate*1000
:0.683*0.44*2.74*1000
:823 Kg
(9) Result:
- Cement: 218 kg/m3
- Fly ash : 102 kg/m3
- Water : 140 litre
- Fine Aggregate:823 kg
- Coarse Aggregate: 1047 kg
- Chemical : 7 kg/m3
- Water cement ratio : 0.4
- Ratio: 1:2.5:3.2
(B)Calculate the Concrete Mix Design for M50 grade concrete without Fly ash
Mix proportion of M50 Grade using fly Ash
(1) Details :
- Type of cement = OPC (43 Grade)
- Maximum size of Aggregate = 20mm
- Cement Content = 320 (Kg/m3)
- Maximum Water content = 0.45
- Workability = 50 mm
- Exposure Condition = Severe
- Method of concrete = pumping
- Degree of supervision = Good
- Type of aggregate = crushed anguler Aggrgate
- Maximum Cement content = w/c = 0.45
- = 186/0.45 = 413 kg/m3
- Chemical Admixture = Super plasticiser
(2) Data for Material :
- Cement : OPC 43 Grade IS 8112
- Specific Gravity of cement : 3.15
- Chemical Admixture : Super plasticiser Confirmation (IS 9103)
- Specific Gravity of Coarse aggrgate : 2.74
- Specific Gravity of Fine aggregate : 2.74
- Water Absorbtion of caorse aggregate: 0.5%
- Water Absorbtion of Fine aggregate: 1%
- free surface moisture fine aggregate: nil
- free surface moisture coarse aggregate: nil
- sieve analysis: 20mm (zone I) (Table 2, IS 383)
- fine aggregate (zone I) (Table 4,IS 383)
(3) Target Mean Strength:
Target Mean Strength Ft = Fck + 1.65 S
- Fck - Characteristic compressive strength
- S - Standard Deviation Factor
Ft= Fck + 1.65 S
= 50 + 1.65 * 5
= 50 + 8.25
Ft=58.25 N/mm2
(4)Water Cement ratio:
water cement ratio :0.45 (IS 456: 2000, Table 5)
hence , 0.45 , Ok
(5) Selection of water content :
(IS 10262 :2009, Table :2)
For 20mm aggregate : 186 litre
water content=186 litres + (6/100) * 186
= 197 litre* 0.71 (29 % for super plasticiser)
= 140 litre
(6)Selection of Cement content:
water cement ratio= 0.45
Min cement content for severe exposure condition; 320 kg/m3
cement content: 186/0.45 = 413.33kg/m3
Hence , 413 kg/m3
(7)Proportion of Aggregate :
0.5 = 0.6 (table 3, 20mm aggregate)
w/c =0.45 (1 % of increase aggregate)
0.45= 0.61
Pumpable concrete (reduction of 10%)
Coarse aggregate : 0.61*0.9 = 0.55
Volume of fine aggregate = 1-0.55=0.45
(8) Mix Calculation :
(a) Volume of aggrgate : 1m3
(b) volume of cement : (Mass of cement/specific gravity of cement) * (1/1000)
: (413/3.14) *(1/1000)
:0.131 m3
(c) Volume of water :(Mass of water/specific gravity of water) * (1/1000)
: (140/1) *(1/1000)
:0.140 m3
(d) Volume of Admixture:(Mass of admixture/specific gravity of admixture) * (1/1000)
: (7/1.145) *(1/1000)
:0.006 m3
(f) Volume of aggregate :[(a-(b+c+d+)]
:[ (1-(0.131+0.140+0.006)]
:0.723m3
(g)Mass of Coarse aggregate: e* volume of aggregate*specific gravity of aggregate*1000
:0.723*0.56*2.74*1000
:1109 Kg
(g)Mass of fine aggregate: e* volume of aggregate*specific gravity of aggregate*1000
:0.723*0.44*2.74*1000
:871 Kg
(9) Result:
- Cement:413 kg/m3
- Water : 140 litre
- Fine Aggregate:871 kg
- Coarse Aggregate: 1109 kg
- Chemical : 7 kg/m3
- Water cement ratio : 0.45
- Ratio : 1:2.1:2.68