M30 Grade Concrete Mix Design with Fly Ash – IS10262
I. STIPULATIONS FOR PROPORTIONING OF M30 GRADE CONCRETE
This section deals with conditions and requirements of the concrete to be made.
A Grade Designation M30
B Type of Cement OPC 53
C Type of Admixture Fly Ash
Maximum Nominal
D 20mm
Size of Aggregate
E Minimum Cement Content 320kg Table 5-IS456
F Maximum Cement Content 450kg As per code
Partial replacement
G 30% as per requirement
of cement by Fly Ash
H Maximum W/C ratio 0.45 Table 5-IS456
I Workability 100mm
Polycarboxylate
J Chemical Admixture Use any brand
Superplasticizers
II. TEST DATA FOR MATERIALS
Materials should be tested in the laboratory as per tests given in the codebook. The
material property will be used in the design process and to check the quality of the
material with the help of codebook standards.
Confirming to
A Cement Used OPC 53
IS8112
B Specific Gravity of Cement 3.15 Test – IS: 2720
C Mineral Admixture Fly Ash Confirming to IS12089
D Specific Gravity of Fly Ash 2.90
E Chemical Admixture @0.6% IS9103
F Specific Gravity of Test – IS 2386
Coarse Aggregate 2.74
Fine Aggregate 2.74
Admixture PCE based 1.12
G Water Absorption Test – IS 2386
Coarse aggregate 0.5 %
Fine aggregate 1%
H Sieve Analysis Test – IS 2386
Confirming to
Coarse aggregate
Table 2-IS383
Confirming to
Fine aggregate Zone II
Table 4-IS383
III. TARGET STRENGTH FOR MIX PROPORTIONS OF M30 GRADE CONCRETE
Strength of the concrete may deviate slightly depends on the quality of the material,
method of mixing and construction practices. Hence target strength (F ck) should be
higher than the required strength of the concrete (f ck). Value of standard deviation(s)
for different grade of concrete is given in Table 1 of IS456.
Fck = fck+1.65s “S” from Table1-IS10262
Fck = 30+(1.65 x 5)
Fck = 38.25 N/mm2
IV. SELECTION OF WATER-CEMENT RATIO
The maximum water-cement ratio for different grade of concrete is given in Table 5-
IS456. You can reduce the water-cement ratio based on your requirements. Water-
cement ratio directly affects the strength of the concrete.
Maximum W/C ratio =0.45 Table 5-IS456
Adopted W/C ratio =0.45
V. SELECTION OF WATER CONTENT
Table 2-IS1026
Maximum Water Content =186 L
for 25 to 50mm slump range
Above water-content is for 25 to 50mm slump but the slump we require is 100mm.
hence we need to increase the water content to get the required slump for good
workability. Clause 4.2 of IS1026 suggests an increase of 3% of water content from
its original value for every increase of 25mm. Here we have a 50mm increase in the
water content hence we have to increase the water content by 6 %.
Water-content for 100mm Slump =186+(0.06*186)
=197.16 L
Since superplasticizers are used water content can be reduced to get good strength
of concrete. Percentage of reduction of water depends on the type of
superplasticizers used in the concrete.
Percentage of Reduction in water content =20%
Water content requirement after SP =198 – (0.20*198)
=157.73
Adopted Water Content =160 L
VI. CALCULATION OF CEMENT AND FLYASH CONTENT
Adopted Water Cement Ratio =0.45
Total Cementitious (Cement +Flyash) requirement = Water Content / WaterCement ratio
=160/0.45
=355.55 kg
Since Fly ash is used the amount of Cementitious content (Cement+Fly ash) shall be
increased to get good workability and strength. the percentage of increase
depending on experience and research. Here we increased the cementitious content
by 1.1 %.
Final Cementitious
= 356*1.1
Content (Cement+ Fly ash )
=391.6 kg
Minimum Cement Content
=320kg Table 5-IS456
required for ‘severe’ exposure
Adopted Cementious content =391.6 kg > 320kg
Fly ash content requirement = 391.6 * 0.30 30% replacement
= 117.48 ~ 118 kg
Cement Content requirement =Cementious content – Fly ash
=391.6-117.48
= 274.12 ~ 274 kg
Calculation of Super Plasticiers @ 0.6 percent to the mass of cementitious content =
391.6*(0.6/100) = 2.35 kg
VII COARSE AND FINE AGGREGATE
The coarse aggregate ratio are given in table 3 but its should be adjusted based on
water-cement ratio based on experience.
Table3-IS10262
Coarse Aggregate ratio =0.62
(For W/C =0.5)
Coarse Aggregate ratio
=0.63
for 0.45 w/c ratio
Final Fine Aggregate ratio =0.37 (1-0.63) = 0.37
VIII MIX CALCULATIONS OF M30 GRADE CONCRETE
A Volume of Concrete = 1 cu.m
B Volume of Cement = Cement weight/(S.G*1000)
= 274/(3.15*1000)
= 0.086 cu.m
C Total Volume of Fly ash = Fly ash weight /(S.G*1000)
= 118/(2.9*1000)
= 0.041 cu.m
D Volume of Water = Water /(S.G*1000)
= 160/(1*1000)
= 0.160 cu.m
E Volume of Superplasticizers = S.P/(S.G*1000)
= 2.35/(1.12*1000)
= 0.002 cu.m
F Total Aggregates requirement = A – (B+C+D+E)
= 1 -(0.086 +0.041+0.160+0.002)
=0.71 cu.m
G Coarse Aggregate (C.A) = F * C.A ratio * S.G * 1000
= 0.71*0.63 *2.74 *1000
= 1225 kg
I Fine Aggregate (F.A) = F * F.A ratio * S.G * 1000
= 720 kg
Cement Fly ash Sand Aggregate Water and Superplasticizer needed for M30 grade
concrete
S.No. MATERIALS QUANTITY
1 Cement 274 kg
2 Flyash 118 kg
3 Fine Aggregate 720 kg
4 Coarse Aggregate (20mm) 1225 kg
5 WATER 160 L
6 SuperPlasticizer 2L
Mix Ratio of M30 Grade concrete by weight with fly ash admixture is Cement :
Flyash: F.A : C.A : Water = 1: 0.43 : 2.6 : 4.47: 0.58
