GB/T 2015-2017 in English
VALIDWhite portland cement
- Issued on:2017-10-14
- Implemented on:2018-09-01
- File Format:PDF
- Delivery:Within 1 day
$109.00
《GB/T 2015-2017白色硅酸盐水泥》由TC184（全国水泥标准化技术委员会）归口，主管部门为中国建筑材料联合会。
Introduction
1. Background and significance of the standard
GB/T 2015-2017 White Portland Cement is an important specification for the production, inspection and application of white Portland cement. This standard replaces the previous GB/T 2015-2005 version, and is mainly optimized and improved in terms of components, classification, technical indicators, etc. This standard was proposed by the China Building Materials Federation and is managed by the National Cement Standardization Technical Committee.
2. Comparison of standard frameworks
| Standard version | Main changes | New content | Adjusted content |
|---|---|---|---|
| GB/T 2015—2017 | Added component definition | New chloride ion content indicator | Optimized radionuclide limit requirements |
| GB/T 2015—2005 | Basic framework is consistent | No new indicators | No radioactivity requirements involved |
3. Interpretation of technical requirements
3.1 Chemical composition index
The technical requirements of white Portland cement are mainly concentrated on chemical composition, physical properties and radioactivity. For example, the sulfur trioxide content shall not exceed 3.5%, and the selective index of chloride ion content is ≤0.06%.
3.2 Physical properties
Physical properties include fineness, setting time, stability and whiteness. The fineness requirement is that the residue on the 45μm square hole sieve is not more than 30.0%, the initial setting time is not less than 45 minutes, and the final setting time is not more than 600 minutes.
3.3 Strength requirements
Strength is an important indicator for measuring cement performance. White Portland cement of different strength grades must meet the flexural and compressive strength requirements specified in Table 1.
| Strength Grade | 3 d Flexural Strength (MPa) | 28 d Flexural Strength (MPa) | 3 d Compression Strength (MPa) | 28 d Compression Strength (MPa) |
|---|---|---|---|---|
| 32.5 | ≥3.0 | ≥6.0 | ≥12.0 | ≥32.5 |
| 42.5 | ≥3.5 | ≥6.5 | ≥17.0 | ≥42.5 |
| 52.5 | ≥4.0 | ≥7.0 | ≥22.0 | ≥52.5 |
4. Implementation Suggestions and Notes
In actual production, it is recommended that cement companies:
- Strictly control the raw material ratio and production process parameters to ensure that the products meet the standard requirements;
- Strengthen factory inspection, especially the detection of radioactivity and chloride ion indicators;
- Regularly calibrate testing instruments to ensure that the measurement data is accurate and reliable.
5. Conclusion
The release and implementation of GB/T 2015-2017 "White Portland Cement" marks the further improvement of product quality and technical requirements in my country's cement industry. Enterprises should strictly produce in accordance with the standards to ensure that their products meet market demand.
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