JC 447-1991 in English
VALIDSteel mesh asbestos cement medium wave tile
- Issued on:1991-11-11
- Implemented on:1992-08-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$242.00
| Standard No: | JC 447-1991 |
| Document status: | VALID |
| Title in English: | Steel mesh asbestos cement medium wave tile |
| Title in Chinese: | 钢丝网石棉水泥中波瓦 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 1991-11-11 |
| Implemented on: | 1992-08-01 |
| Professional Classification: | JC-Building Material |
| Related Keywords: | steel mesh asbestos cement medium
wire mesh asbestos cement medium + cement ≥12 % cement wire mesh |
Introduction
Analysis of the core content of the standard
This standard specifies the technical specification system of wire mesh asbestos cement medium corrugated tiles, mainly including:
- Product classification: divided into A and B grades according to flexural strength/water absorption rate, and divided into superior/first-class/qualified products according to appearance quality
- Structural characteristics: chrysotile + cement as the base material, with a trapezoidal wire mesh reinforcement layer in the middle
- Scope of application: Suitable for roof covering and light composite roof load-bearing panels of building buildings
Comparison of key technical indicators
| Performance parameters | Grade A requirements | Grade B requirements | Test methods |
|---|---|---|---|
| Transverse flexural strength (N/m) | ≥3800 | ≥3300 | GB8040 |
| Water absorption (%) | ≤25 | ≤28 | GB7019 |
| Frost resistance (25 cycles) | No delamination damage | GB8042 | |
Main points of raw material control
Core raw material specifications
- Asbestos fiber: Grade 5 or above chrysotile must be used, with a content of ≥12%
- Cement: 425# or above silicate cement, carbon-containing grinding aids are prohibited
- Wire mesh: cold-drawn low-carbon steel wire weaving, in line with GB343 standard
Typical case: A project used cement containing coal gangue admixture, resulting in a 30% decrease in tile strength
Quality Acceptance Implementation Guide
Sampling Inspection Rules
- Batch range: 200-5000 sheets/batch
- Appearance inspection: Use GB9772 Appendix A method
- Mechanical properties: Transverse flexural strength is tested at a span of 1.8m
Judgment Standards
If any key indicator (flexural strength/water absorption/freezing resistance) fails to meet the standards, the entire batch will be deemed unqualified. Re-inspection is allowed but not more than 2 times
Background of Standard Evolution
When the standard was issued in 1991, it innovatively introduced wire mesh reinforcement technology, which increased the flexural strength of traditional asbestos tiles by more than 40%. The current version still maintains strict control over key indicators such as edge distance deviation ≤5mm and crack width ≤0.2mm.
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