||Attain Quality Time-of-Setting Measures for Cement with ASTM Standard C 191
Determining how fast cement sets is an important indicator of quality. Since automated as well as manual methods are now used to determine time of setting, ASTM Committee C01 on Cement has revised their method.
Standard C 191, Test Method for Time of Setting of Hydraulic Cement by Vicat Needle, now includes procedures for automated testing. The standard covers requirements for the Vicat apparatus, temperature and humidity, preparation of cement paste, molding and setting procedures, precision and bias, and precautions.
A task group of cement producers, laboratory technicians, and other stakeholders developed the revision under the guidelines of the ASTM Time-of-Set Subcommittee.
Automatic Vicat machines capable of determining Vicat time of setting on multiple specimens simultaneously are being used extensively in cement testing laboratories throughout the world, said Frank Hogan, the task group chairman and a consultant with Bulk Materials International, Newtown, Conn. The computer operated machines free the technician from performing the time-consuming measurements required by the manual method.
For further technical information, contact Frank Hogan (phone: 518/475-0188). Committee C01 meets June 26-28 in Salt Lake City, Utah. For meeting or membership details, contact Jim Olshefsky, manager, ASTM technical committees (phone: 610/832-9714). //
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