GB/T 11969-2020 in English
VALIDTest methods of autoclaved aerated concrete
- Issued on:2020-09-29
- Implemented on:2021-08-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$243.00
《GB/T 11969-2020蒸压加气混凝土性能试验方法》由TC197（全国水泥制品标准化技术委员会）归口，主管部门为中国建筑材料联合会。
Introduction
Standard Revision and Technological Evolution
| Technical Parameters | 2008 Edition | 2020 Edition | Main Changes |
|---|---|---|---|
| Measuring Instruments | General Requirements | Specified in Chapters | Separate provisions in Chapters 3.1/4.1 |
| Moisture Content Calculation | Mass Moisture Content | Added Volume Moisture Content | Formula (3) and Clause 3.5.3 |
| Antifreeze test | -15℃freeze for 4h | -15℃freeze for 8h | 6.3.5 Cycle period extension |
Analysis of core test methods
1. Dry density and water absorption test
Key equipment: Electric blast drying oven (200℃), Constant temperature water bath (20±2℃). Specimen preparation requirements:
- 2 groups of 100mm cubic specimens
- Sampling along the gas emission direction from top to bottom
- Dimension deviation ≤±1mm
Application case:
When an AAC board factory used a digital caliper (0.1mm accuracy) for measurement, it was found that the verticality of the specimen exceeded the standard, resulting in a dry density deviation of 5%. After adjusting the fixture, the data returned to the normal range.
2. Mechanical properties test
| Test type | Specimen size | Loading rate | Key equipment |
|---|---|---|---|
| Compressive strength | 100×100×100mm | 2.0±0.5kN/s | Material testing machine |
| Flexural strength | 100×100×400mm | 0.20±0.05kN/s | Arc roller device |
Note: The moisture content needs to be controlled within the range of 10±2% (Clause 4.2.7)
Suggestions for the implementation of the standard
- The laboratory should establish the temperature and humidity calibration records of the drying shrinkage test chamber (Clause 5.1.4)
- It is recommended to use an automatic control box for carbonization test, and the manual device needs to detect the CO2 concentration daily (Clause 7.3.2)
- The antifreeze specimen needs to be immersed in water in steps during the pre-wetting stage (Clause 6.3.2)
Technical difficulties:
In the elastic modulus test, a testing agency found that the difference between δ4 and δ5 exceeded 0.003mm. After improving the specimen centering device, it met the requirements (Clause 4.3.5.j)
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