A-1
A-2
A-3
A-4
A-5
MIX DESIGNS FOR CONCRETE USING FLY ASH
STIPULATIONS FOR PROPORTIONING
M30
1 Grade designation:
OPC 43 grade conforming to IS 269
2 Type of cement:
20 mm
3 Maximum nominal size of aggregate:
Severe
4 Exposure condition
320
5 Minimum cement content
Maximum
W/C
Ratio:
0.45
6
90
7 Workability
Pumpable
8 Method of concrete placing
Crushed angular aggregates
9 Type of aggregate
Super-plasticizer
10 Chemical admixture
TEST DATA FOR MATERIALS
OPC 43 grade conforming to IS 269
1 Cement used:
3.06
2 Specific gravity of cement:
2.8
3 FLY ASH
2.85
4 GGBS
2.25
5 SILICA FUME
2.2
6 RICE HUSK ASH
BAGGASE
ASH
2.5
7
Super-plasticizer
8 Chemical admixture
Specific gravity of Coarse aggregate (at SSD
2.79
9
condition):
Specific gravity of Fine aggregate (at SSD
2.75
10
condition):
1.145
11 Specific gravity of Chemical Admixture:
1
12 Water absorption of Fine aggregate (%):
0.5
13 Water absorption of Coarse aggregate (%):
1.5
14 Free (surface) moisture of Coarse Aggregate:
4
15 Free (surface) moisture of Fine Aggregate:
TARGET STRENGTH FOR MIX PROPORTIONING
5
1 Standard Deviation, S =
6.5
2 Factor based on grtade of concrete, X =
Characteristic compressive strength at 28 days,
30
3 1. f’ck = fck + 1.65 S =
38.25
2. f’ck = fck + X =
36.5
2
4 Target strength(N/mm ) =
38.25
APPROXIMATE AIR CONTENT
20
1 Size of Aggregates:
1
2 Air Content:
SELECTION OF WATER-CEMENT RATIO
38.25
1 Target strength
OPC 43 grade conforming to IS 269
2 Grade of cement
0.44
3 Free W/C required
4
For the prescribed exposure condition, for RCC,
maximum W/C ratio:
5 Free W/C provided
0.45
0.44
A-6
A-7
SELECTION OF WATER CONTENT
W/C for 50mm slump (kg)
1
For (mm)
90
Water content - %age of water reduced after the
2
addition of Super Plasticizer (kg)
CALCULATION OF CEMENT CONTENT
1 W/C ratio
2 Cement content
For the prescribed exposure condition minimum
3
cement content
4 Cement content provided (kg/m3)
FLY ASH
GGBFS
5 SILICA FUME
RISE HUSK ASH
BAGGASE ASH
6 Cement (OPC) (kg)
A-8
186
194.928
25
146.2
0.44
332.27
320
332.27
0
0
0
0
0
0
0
0
0
0
332.27
PROPORTION OF VOLUME OF COARSE & FINE AGGREGATE CONTENT
Zone of Fine Aggregates
1
II
2
Proportionate Volume Of Coarse Aggregatefor
for 20mm Coarse Aggregate & Prescribed Zone FALSE
Fine Aggregates for W/C ratio of 0.5 =
0.62
FALSE
3
Here, water cementious ratio =
0.44
4
Volume of coarse aggregate for the above water
cementious ratio kg/m3=
0.632
5
For pumpable concrete, reduce the volume of CA
by 10%
0.5688
6
Volume of fine aggregate for the above water
cementious ratio kg/m3=
0.4312
FALSE
A-9
MIX CALCULATIONS
1 Total volume m3
1
3
2 Volume of entrapped air in concrete m
3 Volume of cement m3
0.001
0.109
3
4 Volume of fly ash m
5 Volume of GGBS m3
0
6 Volume of Silica Fume m3
7 Volume of Rice Husk Ash m3
8 Volume of Baggase ash m3
0
0
0
0
3
9 Volume of water m
10 Volume of chemical admixture
11 Volume of all in aggregates m3
12 Volume of Coarse aggregate m3
3
A-10
13 Volume of Fine aggregates m
MIX PROPORTIONS
1 Cement (kg/m3)
3
2 Fly Ash (kg/m )
3 GGBS (kg/m3)
0.2
0.0006
0.74
1174.34
877.49
332.27
0
0
3
4 Silica Fume (kg/m )
5 Rise Hush Ash (kg/m3)
6
7
8
9
10
0.146
3
Baggase Ash (kg/m )
Water (kg/m3)
Coarse Aggregate (kg/m3)
Fine Aggregate (kg/m3)
Chemical Admixture (kg/m3)
0
0
0
146.2
1174.34
877.49
3.3227