Mix Design with 20mm Down Aggregates

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  • Topic: Concrete, Cement, Compressive strength
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  • Published : December 22, 2011
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2009-10

REPORT ON MIX DESIGN
M-10 (20 mm down) with 38.5% FA

FIELD QUALITY ASSURANCE DEPT

Mix Design for M-10 Grade of Concrete
1) Design Stipulation –
a) Characteristic compressive strength required in the field at 28 days b) c) Maximum size of aggregate Degree of workability - 10 N/mm2 - 20 mm - 75 – 125 mm - Good - Moderate - 2%

d) Degree of Quality e) f) Type of Exposure Entrapped Air content (max 20 mm)

2) Test Data for Materials –
A) CEMENT a) Cement - Shree Ultra OPC 43 grade b) Specific Gravity - 3.15 B) AGGREGATE -

Sieve Size 1. Impact Value 1.% Water Absorption 2. Specific Gravity 3. Silt Content 4.Flakiness Index 5 Fineness Modulus

20 mm 10 mm MECHANICAL PROPERTIES 17.33 % NA PHYSICAL PROPERTIES 0.21 0.33 2.7 2.69 NA NA 14.01 % 16.12 % NA NA

Sand NA 1.06 2.64 3.08 NA 3.12

C) ADMIXTURE –

Fosroc Conplast SP 430 3) Target Mean Strength of Concrete – (As per IS -10262) The target mean strength of concrete for M-10 Grade = 14 N/mm2

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4) Water Cement Ratio (W/C) – a) Corresponding to TMS b) Corresponding to Exposure Condition (IS 456-2000 table no.5) So, Water Cement Ratio = 0.6 Fine aggregate as % of total aggregate by weight – 45 % (after trials) 5) Individual Aggregate Gradation – (As per IS 383-1970) Sieve size in MM

- 0.7 - 0.6

20 MM % Passing 1 100 95.62 2 100 94.3 3 4 Avg Limit 100 100 100 100 96.71 94.15 95.2 85-100 7.98 0.7 12.33 10.5 0.88 0.9 0-20 0-5 1 100 100 98.86 9.86 2.36 2 100 98.2 92.64 11.89 2.46 3

10 MM % Passing 4 Avg 100 98.65 91.8 10.3 2.5 Limit 100 100 85-100 0-20 0-5

25 20 12.5 10 4.75 2.36

10.51 11.12 0.94 1.05

100 100 96.4 100 91.2 92.66 8.96 10.28 3.32 1.98

Sieve size in MM

SAND 1 100 91.81 80.65 74.14 41.3 15.81 5.49 0.2 2 3 100 100 92.64 91.63 82.38 83.66 64.68 71.9 40.62 43.4 18.48 13.3 5.96 4.72 0.14 0.18 % Passing 4 5 Avg 99.68 99.76 99.89 91.45 95.45 95.45 83.6 87.5 83.6 70.36 70.94 70.4 39.85 40.75 41.2 17.9 15.91 16.3 5.42 3.41 5.4 0.6 0.8 0.38 Limit 100 90-100 75-100 55-90 35-59 8-30 0-10

10 4.75 2.36 1.18 0.6 0.3 0.15 0.075

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FIELD QUALITY ASSURANCE DEPT

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7) All In Aggregate Grading of CA & FA for Concrete Mix Design – Sieve size in MM

% Passing 33 % 20 MM 33 31.42 0 3.465 0.297 0 0 0 0 0 0 22 % 10 MM 22 22 21.7 20.2 2.3 0.55 0 0 0 0 0 45 % SAND 45 45 45 44.95 41.67 37.62 31.68 18.54 7.33 2.43 0.171 Combined Grading 100 98.42 66.71 68.61 44.26 38.17 31.68 18.54 7.33 2.43 0.171 Limits (IS 383) 100 95-100

40 20 12.5 10 4.75 2.36 1.18 0.6 0.3 0.15 0.075

30-50

10 -35 0-6

Note – The above mix proportion is subjected to change if individual gradation of aggregate varies, To achieve specified limits.

All IN AGGREGATE GRADING

FIELD QUALITY ASSURANCE DEPT

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8) Water & Cement Content Cementitious Material - 260 Kg W/C - 0.6 Water - 156 Kg 9) Determination of Coarse & Fine Aggregate content – Maximum size of CA = 20 mm Entrapped Air Content – 2% (As per IS 10262) CA = 1100 Kg & FA = 880 Kg CA I (20 mm) - 660 Kg CA II (10 mm) - 440 Kg Sand - 880 Kg

10) Mix Proportion of 1 cum Concrete (SSD)        Cementitious Material Cement Fly Ash Water CA I (20 mm) CA II (10 mm) Sand - 260 Kg - 160 Kg - 100 Kg - 156 Kg - 660 Kg - 440 Kg - 880 Kg

11) Final Dry Quantities – a) Cementitious Material = 260 Kg b) Water = Extra water to be added for water absorption in the case of dry aggregate. Sieve Size (mm) CA I (20 mm) CA II (10 mm) sand % water Absorption 0.21 0.33 1.06 Total Extra Water Extra Water (Kg) 1.39 1.45 9.33 12.17 Kg

FIELD QUALITY ASSURANCE DEPT

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c) Aggregate CA I (20 mm) - 658.61 Kg CA II (10 mm) - 438.55 Kg Sand - 870.67 Kg 12) Mix Proportion of 1 cum Concrete (Dry Weight)        Cementitious Material Cement Fly Ash Water CA I (20 mm) CA II (10 mm) Sand - 260 Kg - 160 Kg - 100 Kg (38.5 % ) - 168.17 Kg - 658.61Kg - 438.55 Kg - 870.67

Results Summary: After trials the mix found suitable by workability and test results (7 days & 28...
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