The construction of track and field site structures can be combined with the engineering design and construction site conditions, the construction schedule, and the selection of suitable cement types and cement labels. See the table below.
Cement technical indicators
index | Portland cement | Ordinary cement | Slag cement | |||
I | II | |||||
Insolubles(%) | ≤0.75 | ≤1.5 | - | - | ||
Magnesium oxide (%) is not more than | 5.0 | 5.0 | 5.0 (in clinker) | |||
Sulfur trioxide (%) is not greater than | 3.5 | 3.5 | 4.0 | |||
Loss on ignition (%) is not greater than | 3.0 | 3.5 | 5.0 | - | ||
Fineness | Specific surface area greater than 300m2/kg | 80um square hole sieve residue does not exceed 10% | ||||
Stability | Boiling test must pass | |||||
Setting time | Initial setting | Must not be earlier than 45min | ||||
Final coagulation | No later than 390min | No later than 600min | ||||
Notes: 1. Any one of magnesium oxide, sulfur trioxide, initial setting time, and stability does not meet the stipulation as waste.
2. When any one of fineness, final setting time, insolubles, and loss on ignition is not in compliance with the regulations or the blended material exceeds the maximum limit and the strength is lower than the index specified in the product label, it is called a defective product.
Incomplete cement cement brands, labels, factory names and factory numbers are also classified as unqualified;
3. Cement can be packed in bulk or in bulk. Composite cement is packed in bags with a net weight of 50kg ± 1kg per bag. Other cement bags have a net weight of 50kg per bag and must not be less than 98% of the mark quality. Randomly selected 20 bags, the total mass of cement shall not be less than 1000kg. Other forms of packaging are negotiated between the supplier and the buyer. However, the quality requirements for bags must comply with the above principles.
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