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AASHTO T 131-06 Standard Method of Test for Time of Setting of Hydraulic Cement by Vicat Needle
standard by American Association of State and Highway Transportation Officials,
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AASHTO T 131-06 is identical to ASTM C191-04a except provisions specified in this document.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.