1.1 This practice uses the properties of mortar mixtures to predict concrete performance. It was developed and has been used by materials suppliers and is known as the mini-mix method. This mortar mixture procedure may then be used to simulate concrete performance, including evaluation of: 1.1.1 Time of setting, 1.1.2 Rate of bleeding, 1.1.3 Compressive strength, 1.1.4 Water reduction, 1.1.5 Slump and flow, 1.1.6 Slump and flow retention, and 1.1.7 Air entrainment. 1.2 The results of mortar-mixture tests can be suitable for comparing the performance among various chemical admixture systems versus a control mixture without any chemical admixtures. 1.3 UnitsThe values stated in either SI units or inch-pound units are to be regarded separately as standard. 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 non-conformance with the standard. 1.4 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.
This practice is based on procedures originally developed by Grace Construction Products for use in the laboratory to predict the effects of chemical admixtures and different cements on concrete properties using mortar mixtures. It is similar to procedures developed and found to be useful by other materials suppliers, and could also be used by quality control personnel and others.
Keywordsconcrete performance; mortar-mixture test; mortar mixtures; mini-mix
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top