| Mix Design - Inputs and Outputs for 'Construction Concrete' |
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Tutor |
Inputs |
Tutor |
Outputs |
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| Strength |
Input 1 |
Specified 28 day Characteristic Strength (see table 1) |
45 |
MPa |
Output 1 |
F ratio (no. of std deviations
betw target and char strength) |
1.64 |
(see fig 1) |
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Input 2 |
Coefficient of Variation (consult factory records, or see
table 2) |
12.0 |
% |
Output 2 |
Target strength |
56 |
MPa |
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Input 3 |
% failures allowed |
5 |
% |
Output 3 |
#REF! |
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Output 4 |
Standard deviation |
6.7 |
MPa |
| w : c
ratio |
Input 4 |
% fly ash (balance is clinker) |
15 |
% |
Output 5 |
% clinker |
85 |
% |
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Input 5 |
max w:c for capilliary discontinuity |
0.70 |
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Output 6 |
Water : cement ratio
(from fig 2) |
0.46 |
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Input 6 |
% S03 in soil |
0.1 |
% |
Output 7 |
Corresponding Water : ratio (for SO3 in soil) |
0.70 |
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Input 7 |
% S03 in ground water |
0.2 |
% |
Output 8 |
Corresponding Water : ratio (for SO3 in groundwater) |
0.70 |
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Input 8 |
Acidic ground or water (Yes = 1, No = 0) |
0 |
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Output 9 |
Corresponding Water : ratio (for acid in water or ground) |
0.70 |
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Input 9 |
Soft Water (Yes = 1, No = 0) |
0 |
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Output 10 |
Corresponding Water : ratio (for soft water) |
0.70 |
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Output 11 |
Trial water:cement ratio |
0.46 |
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| Superplasticizer |
Input 10 |
% addition by weight of total
cementitious content |
0.8 |
% |
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Input 11 |
Water reduction capability of superplasticizer at above
dosage |
20 |
% |
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Input 12 |
RD of superplasticizer |
1.19 |
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Output 12 |
Trial Superplasticizer addition |
2.78 |
kg/m3 |
| Water |
Input 13 |
Water requirement of sand (or
consult table 3 for options) |
210 |
litres |
Output 13 |
Adjustment for slump relative to
75mm slump (from fig 3) |
-9 |
litres |
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Input 14 |
required slump |
40 |
mm |
Output 14 |
Adjustment for stone size (see fig 4) |
0 |
litres |
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Input 15 |
stone size (6.7, 9.5, 13.2, 19.0 26.5, 37.5, 75) |
19 |
mm |
Output 15 |
Adjustment for superplasticizer |
-40 |
litres |
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Input 16 |
RD water |
1 |
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Output 16 |
Trial Water Requirement |
160 |
litres/m3 |
| Cementitious |
Input 17 |
RD cement |
3.14 |
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Output 17 |
Total Cementitious Content |
348 |
kg/m3 |
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Input 18 |
RD fly ash |
2.2 |
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Output 18 |
Trial Cement content (Cem 1) |
295 |
kg/m3 |
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Output 19 |
Trial Fly Ash content |
52 |
kg/m3 |
| Stone |
Input 19 |
Compacted bulk density (CBD) |
1500 |
kg/m3 |
Output 20 |
K factor (from fig 5) |
0.97 |
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Input 20 |
Fineness modulus (FM) |
1.9 |
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Output 21 |
corresponding stone constent |
1164 |
kg/m3 |
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Input 21 |
Vibration : input a 1 for hand, input a 2 for power |
2 |
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Output 22 |
% increase in stone for fly ash (from fig 6) |
2.8 |
% |
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Input 22 |
RD stone |
2.99 |
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Output 23 |
Trial Stone content |
1196 |
kg/m3 |
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Input 23 |
Adjustment (0 kg if OK, -100kg if too stony, +100 kg if
too sandy) |
0 |
kg |
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| Air |
Input 24 |
% air content (entrapped air) |
1 |
% |
Output 24 |
Trial Air Content |
10 |
litres/m3 |
| Sand |
Input 25 |
% by mass of graded-sand |
70 |
% |
Output 25 |
CHECK
: output 25 + output 27 = 100% : CORRECT |
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Input 26 |
RD of graded-sand |
2.81 |
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Output 26 |
Effective RD of sand |
2.76 |
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Input 27 |
% by mass of filler-sand |
30 |
% |
Output 27 |
Total Sand content |
855 |
kg/m3 |
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Input 28 |
RD of filler-sand |
2.65 |
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Output 28 |
Trial Graded-Sand Content |
598 |
kg/m3 |
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Output 29 |
Trial Filler-Sand Content |
256 |
kg/m3 |
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Output 30 |
Total Mass of Mix |
2561 |
kg/m3 |
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