Chemical admixture type : Super plasticizers Confirming IS 9103:1999
Max cement content: 450kg/cum
2. Material Properties
Cement : Ultratech OPC 53 grade confirming to IS 269
Specific Gravity of cement : 3.15
Chemical Admixture : Fosroc Auromix 400
Specific Gravity of Admixture : 1.09
Specific Gravity
Coarse aggregate
20mm : 2.69
12.5mm : 2.69
Ratio of aggregate: 20mm-50% & 12.5mm-50%
Fine aggregate
Crushed stone aggregate : 2.6
Water: 1
Water Absorption
Coarse aggregate
12.5mm : 0.54%
20mm : 0.37%
Fine aggregate
Crushed stone aggregate : 2.35%
Free Surface Moisture
Fine aggregate : Nil
Coarse aggregate: Nil
Sieve Analysis
Coarse aggregate:
IS Seive Sizes
% Passing
IS Requirement as per IS 383 Table 2
Ratio
Confirming to IS 383 table 2
Single Sized
Graded
50%
50%
20 mm
12.5 mm
20 mm
12.5 mm
20 mm
12.5 mm
Combined 100%
20
95.01
100
85-100
100
100
47.51
50
97.51
12.5
0
99.15
–
85-100
90-100
0.00
49.58
49.58
10
2.54
51.07
0-20
0 – 45
40 – 85
1.27
25.54
26.81
4.75
0.88
0.42
0-5
0-10
0 – 10
0.44
0.21
0.65
PAN
0
0
–
–
–
0
0
0
Sieve Analysis of Coarse Aggregate, M55 grade of concrete
Fine Aggregate: Confirming to grading Zone II of table 4 of IS 383 Note:- as per field trials for pumpable concrete fine aggregate should pass zone II; According to IS 383 clause No. 31.2.2 allows to use crushed stone sand as fine aggregate for concrete .According to IS 383-2016 for crushed stone sand, the permeassible limit on 150 micron IS sieve is increased to20%.
IS Seive Sizes
% Passing
Ratio River Sand:Msand
0
Combined Passing
0
1
IS 383 Zone II
R Sand
M Sand
R Sand
M Sand
4.75
0
100
0
100
90-100
100
2.36
0
85.88
0
85.88
75-100
85.88
1.18
0
58.95
0
58.95
55-90
58.95
600
0
38.87
0
38.87
35-59
38.87
300
0
21.47
0
21.47
8-30
21.47
150
0
9.74
0
9.74
0-10
9.74
Sieve Analysis of Fine Aggregate, M55 grade of concrete
All in aggregate:
IS Seive Sizes
29.5%
29.5%
41%
Specification
Combined Passing
20mm
12.5mm
c sand
min-max
40
100
100
100
100-100
100.00%
20
95.01
100
100
95-100
98.53%
4.75
0.88
0.42
100
30-50
41.38%
0.6
0
0
38.87
10-35
15.94%
0.15
0
0
9.74
0-6
3.99%
Sieve Analysis of All in Aggregate, M55 grade of concrete
3. Target Mean Strength
As per MORTH the Target Mean Strength for M55 Grade = 55+14=69Mpa
4. Selection of water/Cement Ratio (W/C)
As per the specification max Water/Cement + Binder = 0.4
5. Water content Calculation
Ref Tab 2 , IS 10262 , Maximum water content per cum for 20mm Aggregate = 186 litre for 50 mm slump
= 186 + (0.09 * 186) (add 3% for every 25 mm increase )
= 203lit
Based on trials with super plasticizers, water content reduced by 26%,hence the arrived water content = 150.03lit, So Let us add water 150 lit
6. Cementious content Calculation
Based on experience adopt Water-Cementitious Ratio = 0.34
Cementious content (Cement OPC 53 ) = 441.2
Say Cementitious content = 445 kg/m3
Cement = 445 kg/m3
Based on experience and lab trials, Based on experience and lab trials, super plasticizer = 0.6 %
7. Aggregate content Calculation
Ref Tab 3 of IS 10262 , for Sand Zone II , volume of coarse aggregate
per unit vol of total aggregate for 0.5 water-cement ratio = 0.62
Adjust for W/c ratio : Add @ 0.01 for every decrease in 0.05= 0.032
Therefore , corrected proportion = 0.652
Adjust for pumpability , i.e. decrease by 10% = 0.59 %
Based on experience Considering Volume of coarse aggregate = 0.59
Therefore, Volume of Fine aggregate = 0.41
8. Mix volume Calculation per cubic meter of concrete
a) Volume of concrete = 1 m3
b) Volume of cement = (Mass of cement /specific gravity of cement) × 1000 =445/(3.15×1000)= 0.1413 m3
c) Volume of water = (Mass of water /specific gravity of water)× 1000 = 0.150 m3
d) Volume of admixture = (Mass of admixture /specific gravity of admixture)× 1000 = (445×0.6)/(100×1.09×1000)=0.00245 m3
e) Volume of all in aggregate =[a-(b+c+d)] =1-(0.1413+0.150+0.00245)=0.706
f) Mass of coarse aggregate(CA)
1) 20 mm = e × volume of CA × sp. gravity × % of 20mm × 1000 = 0.706*0.59*2.69*0.5*1000= 560.47kg/m3, Say 561 kg/m3
2) 12 mm = e× volume of CA × sp. gravity × % of 12mm × 1000 = 0.706*0.59*2.69*0.5*1000 = 560.47 kg/m3 Say 560 kg/m3
g) Mass of Fine aggregate = e× volume of FA × sp. gravity × 1000 =0.706*0.41*2.6*1000= 752.9kg/m3 Say 753 kg/m3