1.1 This test method covers the determination of compressive strength of concrete made with calcium aluminate cement as the only cement used in the mixture after conversion has occurred. Conversion is a phenomenon experienced by all calcium aluminate cement systems in which calcium aluminate cements are the main binder. 1.2 Units--The values stated in either SI unites or inch-pound units are to be regarded separately as standard. The inch-pound units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. (WARNING-Means should be provided to contain concrete fragments during sudden rupture of specimens. Tendency for sudden rupture increases with increasing concrete strength).
Keywordsconcrete cylinder; concrete specimen; concrete strength; compressive strength; core; cylinder; drilled core; strength; calcium aluminate cement; calcium aluminate cement concrete
Calcium aluminate cements have long demonstrated their utility for a number of demanding applications in which concretes are subjected to harsh environments or required to develop strengths very rapidly. However, because of the formation of certain hydrates specific to calcium aluminate cements, it is critical to know the ultimate or converted strength. All calcium aluminate cements are subject to the conversion phenomenon when used as the sole binder. This specificity must be recognized and the routine quality control program must be designed to evaluate not only the early strength to authorize reopening to traffic but also the long-term strength, that is, the converted strength. This test method proposes an accelerated test method for both initial laboratory validation of a mix design and routine testing of the long-term strength of a concrete made with calcium aluminate cement. This will be used both for quality control and mixture design. It is expected that agencies will adopt this test method for use with CAC concrete.
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
Draft Under Development