|Cement Method Broadened to Include Hydraulic Cements
A newly revised cement test method, C 359, Standard Test method for Early Stiffening of Hydraulic Cement (Mortar Method), has been approved, and the document will be available in November for cement companies and testing laboratories. C 359 now covers hydraulic cements, not just portland cement, because of a major revision by Subcommittee C01.30 on Time of Set, a part of Committee C01 on Cement.
C01.30 chairman Dave Norris, of TXI Riverside Cement, in Oro Grande, Calif., comments that the method previously used a constant amount of water. The revision calls for adjusting the amount of water to produce the required initial consistency. Consequently, the method now enables every cement sample to be assessed with almost a full-scale available for maximum sensitivity.
The C 359 procedure determines the degree to which a cement mortar develops early stiffening. A mortar is prepared and then tested using a modified Vicat apparatus with penetration measurements made at stipulated intervals after the mixing procedure begins.
The subcommittee continues to evaluate the interlaboratory test data that will result in precision and bias statements. Subcommittee C01.30 will meet next during the Dec. 10-12 meetings of Committee C01 in Tampa, Fla.
For further technical information, contact Dave Norris (phone: 760/245-5321). For membership or meeting details, contact Jim Olshefsky, director, Committee Services, ASTM International (phone: 610/832-9714).//
Copyright 2003, ASTM