Specific Weight of Cement in 1 m³ and Bulk Weight by Grade
Cement mortars, like pure cement, are often used in construction. Cement has several advantages compared with other building materials. That is why it is important to understand the calculation of the mass required for a strong and durable foundation. The main calculation indicator is the bulk weight or specific weight of cement.
Factors affecting changes in cement density:
- Production date
- Technological features of manufacturing
- Product type and grade
- Conditions under which the material was stored and transported
Specific Weight of Cement Mix
| Name / cement grade / mix | Specific weight (kg/m³) |
| M 100 | 900 |
| M 150 | 900 |
| M 200 | 900 |
| M 300 | 1100 |
| M 400 | 1100 |
| M 500 | 1100 |
| Sand-cement mix | 1700 |
| Cement-perlite mortar | 1000 - 1400 |
| Cement-slag mortar | 1000 - 1400 |
During transportation, cement can become aerated. In this case, immediately after unloading, the bulk weight of cement may be about 1200 kg/m³. Over time, the material begins to compact, and its bulk density returns to a normal range of approximately 1500-1600 kg/m³. The true particle density of Portland cement should be considered separately: it is close to 3100-3150 kg/m³, but this does not mean that 1 m³ of loose cement will weigh the same. The main factors affecting bulk density are particle size, looseness, compaction and moisture.
When purchasing materials for control, it is important to pay attention to this indicator. It is not always easy to check the density of the substance, but there is an average value that suppliers should follow, about 1300 kg/m³.
During mortar mixing, it is possible to compact it. To do this, the container is filled with coarse sand as a compacting medium, then medium sand is added, and finally finer sand.
Calculation of Cement Bulk Weight for Construction Work
When working with construction mixes, incorrect calculations of material requirements can affect productivity and the quality of the result. The specific weight of cement, like that of any other bulk building material, is determined as M/V, where M is mass and V is volume.
The resulting mass-to-volume ratio is measured in kg/m³. A clear example of specific weight calculations for known grades is shown in the table above.
As can be seen from the table, the specific weight of cement M 500, M 400 and M 300 is equal to or exceeds 1100 kg/m³. In production, the bulk mass of cement materials is controlled by composition, grinding fineness, mineral additives and, for special heavyweight mixes, dense aggregates such as barite.
Frequently Asked Questions
How much does 1 m³ of cement weigh?
The bulk weight of cement is usually around 1200-1600 kg/m³. Immediately after transport it can be looser, while after storage and compaction its bulk weight increases.
Why does 1 m³ of cement not weigh 3100 kg?
About 3100-3150 kg/m³ is the true particle density of Portland cement without voids between particles. In a bag or loose pile there is air between grains, so the bulk density of cement is much lower.
How do you calculate cement quantity for a mix?
For a preliminary estimate, multiply cement volume by its bulk density. For accurate concrete or mortar batching, it is better to use mass-based mix design and account for cement grade, moisture and storage conditions.