JC 454-1992 in English
VALIDGranulated calcium-enhancing liquid slag used in cement
- Issued on:1992-04-17
- Implemented on:1993-01-01
- File Format:PDF
- Delivery:Via email within 1~2 business days
$194.00
| Standard No: | JC 454-1992 |
| Document status: | VALID |
| Title in English: | Granulated calcium-enhancing liquid slag used in cement |
| Title in Chinese: | 用于水泥中的粒化增钙液态渣 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~2 business days |
| Issued on: | 1992-04-17 |
| Implemented on: | 1993-01-01 |
| Professional Classification: | JC-Building Material |
Introduction
Analysis of the core content of the standard
JC 454-92 standard specifies the technical requirements for granulated calcium-enriched liquid slag as an active admixture of cement. Its core indicators include:
| Technical indicators | Superior products | Qualified products |
|---|---|---|
| Quality coefficient K value | ≥1.40 | ≥0.80 |
| Calcium oxide content | ≥20% | |
| Loose bulk density | ≤1.40 kg/L | |
Detailed explanation of key technical requirements
Quality coefficient calculation
Quality coefficient K value calculation formula:
K=(CaO%+MgO%+Al₂O₃%)/(SiO₂%)
This indicator directly reflects the activity of calcium-enhanced slag, among which the calcium oxide content has a key influence on the early strength development of cement.
Physical property control
- Particle size control: >10mm particles ≤5%, maximum size ≤50mm
- Bulk density limit: loose bulk density ≤1.40kg/L to ensure easy grindability
- Impurity requirements: It is strictly forbidden to mix with foreign matter such as metal
Key points of test method
| Test items | Method standard | Special requirements |
|---|---|---|
| Chemical composition | GB 176 | Potassium fluoride treatment step needs to be supplemented |
| Loose bulk density | GB 6645 Appendix B | Use 5mm round hole sieve |
| Particle grading | Customization method | 10mm round hole sieve screening |
Implementation suggestions
Production process control
It is recommended to control the combustion temperature within the range of 1350-1450℃, and adjust the limestone content according to the ash content of the raw coal to ensure that the CaO content meets the standard.
Key points of quality control
- K value and CaO content must be tested for each batch
- Moisture-proof measures should be taken during storage
- Metal detector inspection is required before transportation
Engineering application case
A cement plant used calcium-enhanced slag with a K value of 1.45 to replace 15% of clinker. The strength of cement increased by 2.5MPa in 3 days, and the strength retention rate in 28 days was ≥95%.
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