TB/T 2965-2018 in English
VALIDWaterproof layer of concrete deck for railway bridge
- Issued on:2018-07-16
- Implemented on:2019-02-01
- File Format:PDF
- Delivery:Via email within 5 business days
$321.00
Introduction
Background of Standard Revision and Technical Evolution
This standard replaces TB/T 2965-2011, mainly deleting the contents related to N-type chlorinated polyethylene waterproofing membrane and cement-based adhesive, adjusting the membrane specifications and protective layer setting requirements, and adding a new construction acceptance chapter. It reflects the trend of railway bridge waterproofing technology from single material to composite system.
Classification and construction requirements of waterproof layer
| Type | Applicable parts | Thickness requirements | Key technical indicators |
|---|---|---|---|
| Chlorinated polyethylene membrane | Inside of protective wall | 1.8±0.2mm | Welding peel strength≥3.0N/mm |
| Polyurethane coating | Outside of protective wall | ≥2.0mm | Low-temperature flexural properties -35℃ without cracks |
| Polymer modified asphalt membrane | Full bridge deck | 4.5±0.2mm | Tensile retention rate after thermal aging ≥80% |
Core performance indicator comparison
Key indicator improvement of polyurethane coating
The 2018 version will increase the elongation at break of the coating directly used as a waterproof layer from 400% to 450%, and the bonding strength on wet base surface from 0.5MPa to 0.6MPa, reflecting higher requirements for material durability.
Key points of construction quality control
- Base treatment: flatness ≤3mm, moisture content ≤8%
- Roll material laying: hot melt welding temperature ≥230℃, overlap width 60-80mm
- Coating construction: two-component ratio error ≤±2%, surface drying time ≤4h
- Protective layer: fiber content 1.8kg/m³, polyurethane sealing is required for gap filling
Implementation suggestions
It is recommended to focus on: ①Special requirements for prohibiting horizontal overlap of prefabricated sections of simply supported beams; ②Insulation measures need to be taken when the ambient temperature is lower than 5℃; ③After pouring the protective layer, water conservation and maintenance are required for 14-28 days. It is recommended to establish a full life cycle management file for the waterproof layer, focusing on monitoring the durability of the overlapped parts and detailed nodes.
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