Flow Tables are used to measure the flowability of concrete and other materials. They assess the consistency and workability of a material, particularly in concrete testing, to ensure that it meets the desired specifications for construction purposes. Flow tables come in two main types: hand-operated and motorized.
Flow Table (Hand Operated)
- Table Platform:
- A flat, circular platform that the sample is placed on. It is typically made of metal and has a smooth surface to ensure even flow.
- Standard Dimensions:
- The platform usually has a diameter of 300 mm (about 12 inches), and the height is also standardized.
- Drop Mechanism:
- The hand-operated flow table includes a mechanism to lift and drop the platform a set distance (usually 12.5 mm) at a controlled rate. This is typically achieved using a manual lever or handle.
- Measuring Scale:
- The flow table is equipped with a measuring scale or gauge to record the diameter of the spread of the sample after the table is dropped.
- Sample Preparation:
- Prepare a representative sample of concrete or other material. The sample should be freshly mixed and at the appropriate consistency.
- Placing the Sample:
- Place the sample in the center of the flow table platform, ensuring it is level and evenly distributed.
- Operating the Table:
- Manually operate the handle or lever to lift and drop the platform. The standard drop height and rate must be followed.
- Measuring Flow:
- After the table has been dropped, measure the diameter of the spread of the sample using the provided scale or gauge.
- Recording Results:
- Record the spread diameter and compare it with the required specifications.
Flow Table (Motorized)
- Motorized Mechanism:
- Uses an electric motor to control the lifting and dropping of the platform. This provides consistent and precise operation compared to hand-operated models.
- Automatic Drop Control:
- The motorized flow table has automated controls for adjusting the drop height and rate, ensuring reproducibility.
- Digital Display:
- Often equipped with a digital display or readout for recording the flow measurements, which enhances accuracy and ease of use.
- Standard Dimensions:
- Similar to the hand-operated model, with a standard diameter for the platform and consistent height.
- Sample Preparation:
- Prepare the sample as you would for the hand-operated flow table.
- Placing the Sample:
- Load the sample onto the platform and ensure it is evenly distributed.
- Operating the Table:
- Use the motorized controls to set the drop height and rate. The motor will lift and drop the platform automatically.
- Measuring Flow:
- After the platform has been dropped, measure the spread diameter using the digital display or scale.
- Recording Results:
- Record the spread diameter for analysis and comparison with specifications.
- Concrete Testing:
- Assesses the workability and consistency of concrete mixtures to ensure they are suitable for construction.
- Material Testing:
- Used for other granular materials to determine flowability and consistency, which can be critical for processing and application.
- Consistency:
- Ensures that the concrete or material meets specific flow and workability standards, which is essential for achieving the desired performance in construction.
- Quality Control:
- Helps in maintaining the quality of the material by verifying that it meets the required specifications for consistency and flowability.
- Accuracy:
- Provides accurate and reliable measurements of flowability, which can affect the ease of mixing, placement, and finishing of concrete.
Both hand-operated and motorized flow tables are crucial tools for assessing the flowability and consistency of concrete and other materials, ensuring they meet the necessary standards for construction and application.