A concrete wall, 3 inches thick with general dimensions of 3.00m high by 7.00m long is to be erected. Specify class B mixture using 40kg- cement bags.
Take the total area of the wall:
| SLAB THK | A | B | C | A | B | C | SAND | GRAVEL |
|---|---|---|---|---|---|---|---|---|
| (40KG) | (40KG) | (40KG) | (50KG) | (50KG) | (50KG) | |||
| cm | bags | bags | bags | bags | bags | bags | cu.m. | cu.m. |
| 5.0 | 0.450 | 0.375 | 0.300 | 0.350 | 0.300 | 0.350 | 0.0250 | 0.050 |
| 7.5 | 0.675 | 0.563 | 0.450 | 0.525 | 0.450 | 0.375 | 0.0375 | 0.075 |
| 10.0 | 0.900 | 0.750 | 0.600 | 0.700 | 0.600 | 0.500 | 0.0500 | 0.100 |
| 12.5 | 1.125 | 0.938 | 0.750 | 0.875 | 0.750 | 0.625 | 0.0630 | 0.125 |
| 15.0 | 1.350 | 1.125 | 0.900 | 1.050 | 0.900 | 0.750 | 0.0750 | 0.150 |
| 17.5 | 1.575 | 1.313 | 1.050 | 1.225 | 1.050 | 0.875 | 0.0880 | 0.175 |
| 20.0 | 1.800 | 1.500 | 1.200 | 1.400 | 1.200 | 1.000 | 0.1000 | 0.200 |
| 22.5 | 2.030 | 1.688 | 1.350 | 1.575 | 1.350 | 1.125 | 0.1125 | 0.225 |
| 25.0 | 2.250 | 1.875 | 1.500 | 1.750 | 1.500 | 1.250 | 0.1250 | 0.250 |
| 27.5 | 2.475 | 2.063 | 1.650 | 1.925 | 1.650 | 1.375 | 0.1380 | 0.275 |
| 30.0 | 2.700 | 2.250 | 1.800 | 2.100 | 1.800 | 1.500 | 0.1500 | 0.300 |
From the table, determine 3 inches of class B coefficients.
- Cement = 0.563
- Sand = 0.0375
- Gravel = 0.075
Back to 2.0. Estimating Concrete
2.7. Estimating Concrete Slabs by the Area Method
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