Concrete Mix Design M20 grade of design detailed given below
Data
Grade of concrete = M 20
Type of cement = OPC 53 grade
Maximum size of aggregate = 40 mm
Minimum cement content = 300 kg/m3
Maximum cement content = 450 kg/m3
Maximum water cement ratio = 0.55
Degree of workability = 75 mm
Exposure condition = mild
Specific gravity of cement =3.15
Concrete Design Mix for Varies Grade of Concrete
Specific gravity of aggregate
a) Coarse aggregate = 2.80
b) Fine aggregate = 2.65
Water absorption
a) Coarse aggregate – 4.02 %
b) Fine aggregate – 1.27 %
Free moisture
a) Coarse aggregate – 2.378 %
b) Fine aggregate – 0.403 %
Sieve analysis
a) Coarse aggregate – 3.2
b) Fine aggregate – 2.6
Target mean strength
Mix proportioning for trial
Cement =399 kg/m3
Water = 191.58 kg/m3
Fine aggregate = 650.62 kg/m3
Coarse aggregate = 1222.14 kg/m3
Weight density =399 + 191.58 + 650.62 + 1222.14
= 2463.34 kg/m3
W/c ratio = 0.48
Field correction
Fine aggregate quantity = 650.62kg/m3
Absorption = 1.27 %
Quantity of absorption = 1.27/100 x 650.62
= 8.26 kg/m3
Surface moisture= 0.403 %
Quantity of surface moisture = 0.403/100 x 650.62
= 2.62 kg/m3
Weight of fine aggregate in field condition = 650.62 + 8.26 – 2.62
= 656.26 kg/m3
Coarse aggregate quantity = 1222.14 kg/m3
Quantity of absorption = 4.02/100 x 1222.14
= 49.13 kg/m3
Quantity of surface moisture = 2.378/100 x 1222.14
= 29.06 kg/m3
Weight of coarse aggregate in field condition
= 1222.14 + 49.13 – 29.06
= 1242.21 kg/m3
Concrete Mix Design for M40 Grade
As per our test we conclude that all results satisfy the requirement of IS 10262-2009.Our Mix design satisfies the IS requirement. Hence we can proceed further for casting slabs.From the results, we can conclude that the cost of Bubble Deck is less as compared to conventional slabs.Hence, it is suitable for construction in terms of cost, quality and maintenance.
