Standard Method of Test for
Early Stiffening of Hydraulic Cement
AASHTO Designation: T 185-081
ASTM Designation: C 359-06
This method covers the determination of early stiffening in hydraulic cement mortar.
The values stated in SI units are the standard. The values in parentheses are for information only.
This standard does not purport to address all of the safety concerns, if any, associated with its use.
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
Warning-Freshhydraulic-cementitious mixtures are caustic and may cause chemical bums to skin and tissue upon prolonged exposure.
The use of gloves, protective clothing, and eye protection is recommended. Wash contact area with copious amounts of water after contact.
Wash eyes for a minimum of 15 minutes. Avoid exposure of the body to clothing saturated with the liquid phase of the unhardened material.
Remove contaminated clothing immediately after exposure.
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