The construction of track and field site structures requires careful consideration of engineering design, on-site conditions, project timelines, and the selection of appropriate cement types and grades. Choosing the right cement is essential to ensure durability, strength, and compliance with technical standards. Below is a detailed table outlining the technical specifications for different types of cement.
**Cement Technical Indicators**
| Index | Portland Cement (I) | Portland Cement (II) | Ordinary Cement | Slag Cement |
|-------|---------------------|----------------------|------------------|-------------|
| Insolubles (%) | ≤0.75 | ≤1.5 | - | - |
| Magnesium Oxide (%) | 5.0 | 5.0 | 5.0 | 5.0 (in clinker) |
| Sulfur Trioxide (%) | 3.5 | 3.5 | 3.5 | 4.0 |
| Loss on Ignition (%) | ≤3.0 | ≤3.5 | ≤5.0 | - |
| Fineness | Specific surface area > 300 m²/kg | Specific surface area > 300 m²/kg | 80 μm square hole sieve residue ≤10% | - |
| Stability | Boiling test must pass | Boiling test must pass | Boiling test must pass | Boiling test must pass |
| Setting Time | Initial: ≥45 min | Initial: ≥45 min | Initial: ≥45 min | Initial: ≥45 min |
| | Final: ≤390 min | Final: ≤390 min | Final: ≤600 min | Final: ≤600 min |
**Notes:**
1. If any of the following parameters—magnesium oxide, sulfur trioxide, initial setting time, or stability—fails to meet the requirements, the cement is considered waste.
2. If fineness, final setting time, insolubles, loss on ignition, or blended material content exceeds limits, or if the strength falls below the labeled standard, the product is classified as defective.
3. Incomplete labeling, missing factory name, or incorrect batch number also results in the product being deemed unqualified.
4. Cement can be supplied in bulk or bagged form. Composite cement should be packed in bags with a net weight of 50 kg ± 1 kg. Other types of cement should be packed in 50 kg bags, with a minimum of 98% of the marked weight per bag. When 20 bags are randomly selected, the total weight should not be less than 1000 kg. For alternative packaging methods, agreements between the supplier and buyer are required, but all packaging must meet the same quality standards.
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