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