Which of the following are the specifications of a cement bag for storage?
A. weight 50 kg
B. height 18 cm
C. plan area 3000 sq. cm
D. volume 35 liters
Source Explanation: The weight of one bag of cement is 50 kg. The height of a cement bag is 18 cm. The volume of one bag of cement is 35 liters. The bulk density of cement is 1440 kg/m³. The plan area of a cement bag is ~3000 cm² (0.3 m²).
🔬 Understanding Standard Cement Bag Specifications
For consistency in construction, volume batching, and storage, cement is sold in standardized bags with well-defined properties. Knowing these standard values for weight, volume, and dimensions is essential for site engineers for inventory management, mix design calculations, and planning storage layouts. This question tests the knowledge of these common industry standards.
📝 Detailed Analysis of Each Specification
(d) A, B, C and D
This is the correct answer because all four statements (A, B, C, and D) represent the standard, accepted specifications for a single bag of cement.
A. weight 50 kg
This is a correct statement. This is the most well-known specification. A standard bag of cement in India and many other parts of the world has a net weight of 50 kg.
B. height 18 cm
This is a correct statement. The typical height or thickness of a filled 50 kg cement bag is approximately 18 cm. This dimension is crucial for calculating the height of a stack of bags.
C. plan area 3000 sq. cm
This is a correct statement. The plan area (length x width) of a cement bag is approximately 3000 cm² (or 0.3 m²). This is important for planning the layout of bags in a warehouse.
D. volume 35 liters
This is a correct statement. The volume of loose cement powder in one 50 kg bag is taken as 35 liters (or 0.035 m³). This value is frequently used in nominal mix design calculations where batching is done by volume.
📊 Standard Cement Bag Specifications
| Specification | Standard Value |
|---|---|
| Weight | 50 kg |
| Volume | 35 liters (0.035 m³) |
| Plan Area | ~3000 cm² (0.3 m²) |
| Height | ~18 cm |
💡 Study Tips
- 50 kg is Key: The 50 kg weight is the most fundamental unit. Many other calculations are based on it.
- Memorize the Volume: 35 liters (or ~0.035 m³) is a very common number used in mix design problems. It's essential to remember this conversion.
- Connect the Numbers: Knowing these standard dimensions helps in practical site management, from estimating the number of bags needed per cubic meter of concrete (~28.8 bags) to planning the size of the storage shed.