ASTM C451
Full Name
ASTM C451 – Standard Test Method for Early Stiffening of Hydraulic Cement (Paste Method)
Scope
ASTM C451 covers the determination of early stiffening in hydraulic cement paste.
Key points:
- Purpose: the main purpose of this test method is to identify the degree to which cement paste develops early stiffening and to determine if a cement complies with a specification limit on early stiffening. Early stiffening can be an indicator of issues like false set or flash set.
- Material: this test method is designed specifically for hydraulic cement paste, which is a mixture of cement and water.
- Measurement: the test involves measuring the penetration of a Vicat needle into the cement paste at two different times. The ratio of the final penetration to the initial penetration, expressed as a percentage, is used to assess early stiffening.
ASTM C451 Accredited Laboratory
Applied Testing & Geosciences, LLC is accredited for performing tests using the ASTM C451 standard.
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Resources
Keywords
Vicat apparatus; initial penetration; final penetration; time of setting; false set; flash set; early stiffening; hydraulic cement paste; normal consistency; paste method; test specimen; test procedure; penetration resistance; temperature; water-cement ratio