Slump test before concrete is shipped is an important step in the concrete production process. The slump test before shipment helps to ensure the quality of the concrete and minimize the risks during concrete use.

The slump of concrete is the phenomenon of the concrete surface sinking in relation to the fixed plane, and is measured in millimeters (mm). The slump of concrete depends on many factors such as particle ratio, water content, mixing method, mixing time, molding time and temperature.

To test the slump before the concrete is shipped, the following steps are taken:

• Prepare the mold: The mold is a cylinder with a diameter of 100mm and a height of 200mm. Molds are cleaned and oiled to prevent sticking.
  
  
• Pour concrete into the mold: Concrete is mixed with the correct proportions of elements and water content as prescribed. Concrete is poured into the mold according to the method of capping, each floor is poured about 50mm and pressed tightly by a pile crusher.
  
  
• Leave the concrete for a period of 15-30 minutes to allow the concrete to settle naturally.
  
  
• Slump measurement: After the concrete has settled naturally for the specified time, the slump is measured by measuring the distance from the top surface of the concrete to the fixed plane below with a slump measuring device.
  
  
• Determination of slump: The slump is calculated as the difference between the initial height of concrete and the height after natural settling. If the slump of concrete exceeds the allowable limit, the concrete will not meet the technical requirements and will not be shipped.

When testing slump before shipment, concrete manufacturers need to ensure the standards and specifications set forth by the authorities. This ensures that the concrete produced meets the required requirements and can meet the requirements for use.

There are many benefits to having a slump test before the concrete is shipped. First, it helps to ensure the quality of the concrete, especially the strength and durability of the concrete. The lower the slump of the concrete, the higher the strength and durability of the concrete.

Second, slump test before shipment helps to ensure safety during concrete use. If the slump of concrete is too high, the concrete may deform, causing problems during use and endangering users.

Finally, pre-shipment slump testing also saves production costs. If the concrete does not achieve the required slump, the manufacturer will have to discard or reuse the concrete, increasing production costs.