1.1 This test method is for the determination of the foam index of a mixture of cementitious materials, air-entraining admixture, and water. 1.2 Units--The values stated in SI units are to be regarded as 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 to use. Warning-Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure.
Keywordsair-entraining admixture; foam index; foam stability
The purpose of the test method is to assess changes in a given combination of cementitious materials and air-entraining admixture that may affect air entrainment when that combination of materials and air-entraining admixture is used in concrete. Determination of the foam index is accomplished by producing a slurry mixture of portland cement, SCM, and AEA; vigorously shaking the slurry mixture in a sealed container; and then observing the stability of the foam produced. The number of drops of AEA solution added to produce a stable foam is recorded as the foam index. In many cases, a slurry mixture of portland cement, SCM, and AEA is compared to a slurry mixture with portland cement and AEA only and the test method addresses this approach as well. The test will be used by any producer of concrete preparing mixtures with fly ash.
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
Ballot Item Approved as C1827-2020 and Pending Publication