【国外标准】 Standard Test Method for Determination of the Air-Entraining Admixture Demand of a Cementitious Mixture

5.1 For a specific mixture of cementitious material and AEA solution, the foam index or the absolute volume of AEA determined by this test method provides a measure of effectiveness in producing a stable air-void system for that specific mixture. Values of foam index can be compared only if the AEA solutions used in each test have the same concentration of AEA, the same type of AEA is used, and the same cementitious materials are used. Values of absolute volume of AEA can be compared only if the AEA solutions used in each test are prepared using the same AEA type.5.2 The foam index or the absolute volume of AEA of a cementitious mixture can be expressed as an absolute value, or as a ratio with the foam index or the absolute volume of AEA, respectively, obtained using a slurry of only portland cement and water.5.3 When successive foam index or absolute volume of AEA test results are compared, changes can be detected in the effectiveness of the AEA with a specific mixture of cementitious material in producing concrete with a suitable entrained air-void system.5.4 The foam index and the absolute volume of AEA are not a quantitative measure of AEA dosage for a concrete mixture.1.1 This test method is for the determination of the air-entraining admixture (AEA) demand of a mixture of cementitious materials, AEA, and water.1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Warning—Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure.21.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.