This standard specifies the terms and definitions, classification, grading, technical requirements, test methods, inspection rules, packaging, marking, transport and storage of fly ash used for cement and concrete.
This standard is applicable to fly ash serving as admixture for mixing of mortar and concrete as well as that serving as active admixture in cement production.
2 Normative References
The following documents are indispensable for the application of this standard. For dated reference, only the edition cited applies. For undated reference, the latest edition of the normative document (including any amendments) applies.
GB 175 Common Portland Cement
GB/T 176 Methods for Chemical Analysis of Cement
GB/T 208 Standard Test Method for Cement Density
GB/T 1345 The Test Sieving Method for Fineness of Cement
GB/T 1346 Test Methods for Water Requirement of Normal Consistency, Setting Time and Soundness of the Portland Cement
GB/T 2419 Test Method for Fluidity of Cement Mortar
GBT 5484 Methods for Chemical Analysis of Gypsum
GB 6566 Limits of Radionuclides in Building Materials
GB/T 12573 Sampling Method for Cement
GB/T 17671-1999 Method of Testing Cements - Determination of Strength
GSB 08-1337 Chinese ISO Standard Sand
GSB 08-2506 Standard Sample for Fineness of Fly Ash
GSB 14-1510 Standard Cement Sample for Strength Inspection
3 Terms and Definitions
For the purposes of this document, the following terms and definitions apply.
3.1
fly ash
powder collected from the gas in flue of pulverized coal boiler
Note: Fly ash does not include the following: (1) when the coal is calcined together with urban garbage or other wastes; (2) when industrial or urban garbage is calcined in the incinerator; (3) the powder collected by burning in a circulating fluidized bed boiler.
3.2
reference cement
portland cement or ordinary portland cement with strength grade of 42.5 which is in conformity with GB 175 and meets the relevant requirements of this standard
3.3
testing sample
made by mixing the reference cement and fly ash to be inspected in the mass ratio of 7:3
3.4
reference mortar
made by mixing the reference cement with standard sand of specified grading in the mass ratio of 1:3
3.5
testing mortar
made by mixing the testing sample with standard sand of specified grading in the mass ratio of 1:3
3.6
strength activity index
the ratio of compressive strength of testing mortar to that of reference mortar at the specified age, expressed as a percentage
