Vicat Apparatuses

What is the Vicat apparatus?

Vicat apparatus is a testing instrument used to determine the consistency and setting times (initial and final) of cement, gypsum, and other hydraulic binders. It consists of a frame equipped with a vertically movable rod fitted with different types of plungers or needles, depending on the test being performed.

What is the composition of the Vicat apparatus?

1. Stand or Frame: A structural component that supports the entire device.
2. Plunger/Rod: Install different types of probes (needles or cones) that can move freely vertically.
3. Scale/Rotation: Used to read the depth of needle sinking.
4. Vicat Mold: Generally circular or conical in shape, used to hold mortar or grout for testing purposes.
5. Needle or Cone: Choose the needle according to the testing item: The general consistency test uses a standard needle (diameter 1.13 ± 0.05mm, length 50mm). The initial and final setting time tests use needles or rings with special geometric dimensions.

What are the functions of the Vicat apparatus?

• Standard Consistency Test: Determine the amount of water required for the slurry to achieve normal working consistency.
• Initial Setting Time: The time required from the start of mixing with water until the needle cannot sink to the bottom of the sample by about 5mm.
• Final Setting Time: The time required for the needle to leave a clear imprint on the surface of the sample.

What is the Vicat apparatus used for?

• The laboratory is used to control cement quality and construction availability.
• Used in engineering projects to evaluate whether the initial and final setting of cement meet construction requirements.
• Education and research institutions conduct research on cement performance.