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AASHTO T 131-15
- Standard Method of Test for Time of Setting of Hydraulic Cement by Vicat Needle (ASTM Designation: C 191-13)
- standard by American Association of State and Highway Transportation Officials, 2015
- Publisher: AASHTO
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These test methods determine the time of setting of hydraulic cement by means of the Vicat needle. Two test methods are given; Method A is the Reference Test Method using the manually operated standard Vicat apparatus, while Method B permits the use of an automatic Vicat machine that has, in accordance with the qualification requirements of this method, demonstrated acceptable performance.