JC/T 907-2018 in English
VALIDInterface treating agent for concrete
- Issued on:2018-04-30
- Implemented on:2018-09-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$146.00
本标准规定了混凝土界面处理剂的术语和定义、分类和标记、一般要求、技术要求、试验方法、检验规则、标志、随行文件、包装和贮存。
本标准适用于改善砂浆层与水泥混凝土、加气混凝土或以粉煤灰、石灰、页岩、陶粒等为主要原材料制成的砌块或砖等材料基面粘结性能的水泥基界面剂。
Introduction
Core changes in the standard revision
| Revision dimensions | 2002 version | 2018 version |
|---|---|---|
| Technical indicators | Includes shear bond strength | Deletes shear indicators and adds lateral deformation requirements |
| Test methods | 5 durability tests | Increased to 6 (alkaline-resistant treatment added) |
| Classification system | Unspecified substrate type | Divided into Type I (cement concrete) and Type II (aerated concrete, etc.) |
Analysis of key technical requirements
Physical and mechanical performance indicators
The standard stipulates that the interface agent must pass 6 working condition tests: untreated, immersed in water, heat-resistant, freeze-thaw, alkali-resistant and tensile bond strength after 20 minutes of exposure. The original bond strength of Type I products is required to be ≥0.7MPa, and that of Type II is ≥0.5MPa.
New lateral deformation test
The GB/T 12954.1-2008 method is used, requiring the interface agent to have a deformation capacity of ≥2.5mm when subjected to shear stress, ensuring that the bonding effect is maintained when the substrate expands and contracts.
Implementation points
Engineering application case
In a certain affordable housing project in Shanghai, PI type interface agent was used to treat the aerated concrete block wall. After 28 days of curing, the measured bonding strength reached 1.2MPa, which was 40% higher than that of the traditional process.
Key to quality control
- A planetary mixer must be used for mixing (rotation 140±5r/min, revolution 62±5r/min)
- Standard curing conditions: temperature 23±2℃, humidity 50±5%
- Freeze-thaw cycle test must be strictly controlled between -15±3℃ and 23±2℃
Background of standard evolution
With the development of prefabricated buildings, the application of interface treatment agents in prefabricated component connections has surged. The 2018 version of the standard responds to the special needs of marine engineering and areas with large temperature differences by adding alkali resistance and lateral deformation indicators.
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