Definition
Putty strain tester is a special testing equipment used to evaluate the construction performance of putty materials under specific conditions. It quantifies the operability, uniformity and adaptability of putty by simulating the mixing and application process in actual construction, providing a basis for material quality control and process optimization.
How it works:
The instrument is based on the principle of mechanical agitation combined with resistance measurement. The agitator paddle is typically driven by a motor to rotate at a preset speed in a container containing a standard putty sample, while the sensor records the change in torque or power consumption during the stirring process in real time. By analyzing these data, the consistency, cohesion, and state stability of the putty under continuous stirring can be reflected. The core relationship can be expressed as: M = k × τ, where M is the measured torque value, τ is the internal shear stress of the material, and k is the instrument structure constant.
Measurement method
Measurements should be taken in standard temperature and humidity conditions. The prepared putty sample is first loaded into the instrument container to ensure a consistent packing density. After starting the instrument, the stirring paddle runs at the specified speed for a specific time, and the system automatically records the torque-time curve of the whole process. The key evaluation indicators include initial stirring resistance, resistance change rate and final stability value. After the test, the curve feature points should be analyzed with reference to relevant industry standards (such as construction putty test specifications) and the repeatability error should be calculated.
Influencing factors
The results of the assay are influenced by many factors. The materials include putty ratio, aggregate particle size distribution, water-retaining agent content and aging time; The instrument parameters include the geometry of the stirring paddle, the rotation speed and the immersion depth. Changes in temperature and humidity under environmental conditions will affect the evaporation rate of water and the rheological properties of materials. The sampling method and container cleanliness in the operation process may also introduce system errors, which need to be controlled through standardized pretreatment processes.
Applications:
The instrument is mainly used in the research and development of building materials and production quality control. In putty production enterprises, it is used for batch performance consistency monitoring and new formula development verification; In the field of construction, it can provide data support for the selection of process parameters under different climatic conditions. The testing agency issues a material compliance report based on its test results. In addition, in the acceptance of decoration engineering and academic research, the equipment can also provide an objective basis for performance comparison.
Key points of selection
When selecting a model, it should first confirm that the measurement range matches the characteristics of the material to be measured, focusing on the torque range and speed control accuracy. The instrument structure should be easy to clean and the key components should be wear-resistant, and the data acquisition system should have real-time curve display and export functions. It is recommended to prioritize equipment that meets the metrology requirements of national standards and provides traceable calibration services, while considering whether the sample adapter configuration covers common putty types. The ergonomic design of the operation interface and the after-sales technical support system are also the guarantee factors for long-term use.