AASHTO T 131-22
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Standard Method of Test for Time of Setting of Hydraulic Cement by Vicat Needle (ASTM Designation: C191-19)
American Association of State Highway and Transportation Officials , 2022
Pages: 13
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.
Note—For the method for determining the time of setting by Gillmore needles, see AASHTO T 154.
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