JC 436-1991 in English
VALIDexpanded ferroaluminate cement
- Issued on:1991-07-20
- Implemented on:1992-06-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$194.00
| Standard No: | JC 436-1991 |
| Document status: | VALID |
| Title in English: | expanded ferroaluminate cement |
| Title in Chinese: | 膨胀铁铝酸盐水泥 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 1991-07-20 |
| Implemented on: | 1992-06-01 |
| Professional Classification: | JC-Building Material |
| Related Keywords: | ferroaluminate cement
ferroaluminate cement introduction analysis traditional sulphoaluminate cement ordinary cement technical indicators parameters micro-expansion type expansion type |
Introduction
Analysis of the core content of the standard
The expanding ferroaluminate cement defined in this standard is a hydraulic cementitious material with iron phase, anhydrous calcium sulphoaluminate and dicalcium silicate as the main mineral components. Its notable feature is that the controllable expansion performance can be achieved by adjusting the amount of limestone and gypsum.
Comparative Analysis of Technical Indicators
| Parameters | Micro-expansion type | Expansion type |
|---|---|---|
| 1d free expansion rate | ≥0.05% | ≥0.10% |
| 28d free expansion rate | ≤0.5% | ≤1.0% |
| 28d compressive strength | ≥52.5MPa | |
Key performance requirements
Setting time control: initial setting ≥30 minutes, final setting ≤180 minutes. This window period design not only ensures construction operability, but also avoids excessive retarding affecting early strength development.
Free calcium oxide limit: strictly ≤0.3%, far lower than the standard for ordinary cement, which is a key measure to prevent later volume stability problems.
Engineering application suggestions
1. Micro-expansion type is suitable for deformation-sensitive underground waterproofing projects, and its 0.05-0.5% expansion range can effectively compensate for shrinkage
2. Expansion type is more suitable for seawater environment structures, and the 1.0% expansion rate can continuously resist the shrinkage caused by chloride ion corrosion
Standard development background
When this standard was issued in 1991, it innovatively introduced the iron phase mineral system. Compared with traditional sulphoaluminate cement, it has significantly improved seawater corrosion resistance and later strength stability. Although it has not been revised since 2000, its technical route is still cited in the current GB/T50476 "Concrete Structure Durability Design Code".
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