Method of findingthe dry ingredient quantity of 1 m3
concrete.
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Answer Posted / b.subhash
Estimating Quantities of material needed.
1. Calculate the volume of concrete needed.
2. Estimate the total volume of dry material by
multiplying the required volume of concrete by 1.65 to get
the total volume of dry loose material needed (this includes
10% extra to compensate for losses).
3. Add the numbers in the volumetric proportion that you
will use to get a relative total. This will allow you later
to compute fractions of the total needed for each
ingredient. (i.e. 1:2:4 = 7).
4. Determine the required volume of cement, sand and
gravel by multiplying the total volume of dry material (Step
2) by each components fraction of the total mix volume (Step
3) i.e. the total amount cement needed = volume of dry
materials * 1/7.
5. Calculate the number of bags of concrete by dividing
the required volume of cement by the unit volume per bag of
cement (0.0332 m3 per 50 kg bag of cement or 1 ft3 per 94 lb
bag).
For example, for a 2 m x 2 m x 10 cm thick pump pad:
1. Required volume of concrete = 0.40 m3
2. Estimated volume of dry material = 0.4 x 1.65 = 0.66 m3
3. Mix totals = 1+2+4 = 7 (1:2:4 cement:sand:gravel)
4. Ingredient Volumes: 0.66 x 1/7 = .094 m3 cement
0.66 x 2/7 = .188 m3 sand
0.66 x 4/7 = .378 m3 gravel
5. # Bags of cement: 0.094 m3 cement / .0332 m3 per 50 Kg bag
= 2.83 bags of cement (use three bags)
| Is This Answer Correct ? | 158 Yes | 44 No |
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