Bellows Method Autogenous Shrinkage Tester ASTM C1698
1.Introduction
Autogenous shrinkage of cement mortar refers to the volume shrinkage caused by cement hydration reaction in the absence of external load and water exchange. This shrinkage may cause micro cracks inside the mortar, which in turn affects its mechanical properties and durability. Therefore, determining the autogenous shrinkage of cement mortar has important engineering significance and research value.
This product is developed in accordance with the American standard ASTM C1698 and is mainly used to automatically measure the autogenous shrinkage and expansion changes of concrete. Through rigid brackets, standard rods, electronic micrometers and bellows, the volume deformation of the sample is converted into linear deformation to avoid water loss during the test.
Bellows Method Autogenous Shrinkage Tester ASTM C1698
2.This product can be applied to the following fields
1. Evaluate material properties
Shrinkage characteristic analysis: Autogenous shrinkage is one of the important performance indicators of cement-based materials. Determining autogenous shrinkage can help researchers understand the volume stability of mortar.
Material optimization: Through autogenous shrinkage determination, the mix design of cement mortar can be optimized to reduce the occurrence of shrinkage cracks.
2. Ensure engineering quality
Crack control: Autogenous shrinkage is one of the main causes of cracks in mortar and concrete structures. By measuring autogenous shrinkage, the occurrence of cracks can be predicted and controlled to ensure the integrity and durability of engineering structures.
Long-term performance evaluation: Autogenous shrinkage affects the long-term performance of mortar, and measuring autogenous shrinkage helps to evaluate its stability during service.
3. Supporting high-performance material research
High-performance mortar: With the widespread application of high-performance mortar (such as UHPC), the impact of its autogenous shrinkage on the structure is more significant. Measuring autogenous shrinkage helps to study the characteristics of high-performance mortar.
Additive influence: By measuring autogenous shrinkage, the influence of different additives (such as water reducers, expansion agents, etc.) on the shrinkage performance of mortar can be studied.
4. Compliance with standards and specifications
Industry standards: Autogenous shrinkage measurement is an important part of many industry standards (such as ASTM C1698), and the measurement results can provide a basis for project acceptance and quality control.
Scientific research needs: In the field of scientific research, autogenous shrinkage measurement is an important means to study the microscopic mechanism and macroscopic performance of cement-based materials.
5. Preventing structural failure
Prestress loss: In prestressed concrete structures, autogenous shrinkage may lead to prestress loss, and measuring autogenous shrinkage helps to evaluate and prevent this problem.
Deformation control: Autogenous shrinkage can cause deformation of the structure. Measuring autogenous shrinkage can provide data support for design and construction, ensuring the safety and stability of the structure.
6. Promote technological innovation
New material research and development: Through autogenous shrinkage measurement, the performance of new cement-based materials can be evaluated and technological innovation of building materials can be promoted.
Process improvement: Measuring autogenous shrinkage helps optimize the construction process and reduce quality problems caused by shrinkage.
Bellows Method Autogenous Shrinkage Tester ASTM C1698
3.Features
1. Patented rigid bracket structure:
The independently developed new rigid bracket structure significantly improves the accuracy of the test results. This structure has been patented to ensure more reliable measurement data.
2. Customized bellows and brackets:
The bellows size is customized according to user needs, and the appropriate rigid bracket is processed to meet the measurement needs of different test materials.
3. Flexible multi-channel configuration:
The test channel can be flexibly customized according to user needs, providing 3 channels, 6 channels, 9 channels and 12 channels. More channels can also be customized according to special needs to meet large-scale test needs.
4. Accurate measurement in a wide temperature range:
High-precision measurement can still be achieved under a wide range of temperature changes from 5ºC to 40ºC, ensuring that the test results are not affected by ambient temperature.
| High-precision measurement |
|
| Resolution |
1um |
| Range |
Standard 0-12mm |
| Geopolymer-specific |
0-25mm |
| Maximum measurement error at full scale |
Standard: not more than 3um |
| Geopolymer-specific |
Not more than 5um |
| Structural design |
Standard: 476mm |
| Rigid bracket length |
500mm |
| Geopolymer-specific |
Φ29×(420±5)mm |
| Bellows dimensions |
425mm |
| Deformation-free calibration rod |
1um |
| Intelligent data acquisition |
|
| Special software |
Equipped with special data acquisition software to realize automatic data collection, ensuring efficient test process and accurate and reliable data. |
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