GB/T 39549-2020 in English
VALIDFiber reinforced thermosetting composites septic tank
- Issued on:2020-12-14
- Implemented on:2021-04-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$243.00
《GB/T 39549-2020纤维增强热固性复合材料化粪池》由TC39（全国纤维增强塑料标准化技术委员会）归口，主管部门为中国建筑材料联合会。
Introduction
Analysis of the core content of the standard
| Technical indicators | SMC septic tank | Wrapped septic tank |
|---|---|---|
| Flexural strength (MPa) | ≥135 | ≥300(circumferential) |
| Elastic modulus (GPa) | ≥8.0 | ≥10.0(circumferential) |
| Barcol hardness | ≥45 | ≥40 |
Key technical innovations
Breakthrough in material system: The standard requires that the reinforcement material must be alkali-free glass fiber (in compliance with GB/T 18369/18370), and the resin must pass the chemical resistance CM type certification to ensure that the strength retention rate is more than 85% in the manure liquid corrosion environment.
Structural design innovation: The three-grid volume ratio is stipulated to be 2:1:3, and the manure pipe adopts an I-type or inverted I-type staggered arrangement, with a pipe diameter of ≥100mm and a 45° bevel cut to effectively prevent short-flow.
Implementation and Application Guide
Installation Precautions
- Foundation treatment: lay 100±10mm sand layer after compaction, and remove sharp stones
- Covering depth: ordinary type (Type I) ≤1m, reinforced type (Type II) ≤2m
- Anti-freezing measures: in cold areas, ensure that the septic tank is placed below the frozen soil layer
Key points for quality acceptance
- Wall thickness detection: ultrasonic thickness measurement at 40 points, minimum value ≥90% of the designed thickness
- Sealing test: inject water to the upper edge of the slag cleaning hole, no leakage for 24 hours
- Load verification: 1.6kN/m² static load test (simulating 2m covering pressure)
Inspiration from industry development
The implementation of this standard promotes the upgrading of composite septic tank production process from traditional hand lay-up to compression molding (SMC) and filament winding, requiring manufacturers to establish a complete raw material traceability system. It is recommended to focus on:
1. Verification of resin corrosion resistance (need to pass 4 media tests)
2. Reinforcement process of connection parts (reinforcement layer ≥3mm, single side length ≥100mm)
3. Service life commitment (refer to GB/T 38836 requirements)
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