This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T18046-2008 Granulated Blast Furnace Slag Powder for Cement and Concrete. The following main changes have been made with respect to GB/T18046-2008:
——"Mortar" is added in the standard name;
——In the technical requirements, two indexes of “initial setting time ratio and insoluble matter” of slag powder are added (see Chapter 5);
——In the technical requirements, the 7d activity index of S95 slag powder is changed from “not less than 75%” to “not less than 70%”; the ignition loss of slag powder is changed from “not more than 3.0%” to “not more than 1.0%” (See Chapter 5, Chapter 5 of Edition 2008);
- The chloride ion test method is changed from "per JC/T420" to "according to GB/T176" (see 6.5, 2008 version 6.3);
——In the factory inspection, the “initial setting time ratio, loss on ignition and insoluble matter” test items have been added (see 7.3, 7.2.2 of Edition 2008);
——Compared with the technical requirements of “3d compressive strength” for cement, the specific surface area is changed from “300m2/kg to 400m2/kg” and “350m2/kg to 400m2/kg” (see A.2.1, 2008 version A.3.1) ).
This standard was proposed by China Federation of Building Materials.
This standard is under the jurisdiction of the National Cement Standardization Technical Committee (SAC/TC184).
Contents
1 Scope 1
2 Normative References 1
3 Terms and Definitions 1
4 Components and Materials 2
5 Technical Requirements 2
6 Test Methods 2
7 Inspection Rules 4
8 Factory Leave, Delivery and Acceptance 6
9 Packaging, Marking, Transportation and Storage 6
Annex A (Normative) Determination Method for Activity Index, Fluidity Ratio and Initial Setting Time Ratio of Slag Powder 8
Annex B (Normative) Determination Method for Moisture Content of Slag Powder 12
Annex C 14
(Normative) Determination Method for Vitreous Content of 14
Slag Powder 14
Granulated Blast Furnace Slag Powder Used for Cement, Mortar and Concrete
1 Scope
This standard specifies the definition of granulated blast furnace slag powder (hereinafter referred to as slag powder), components and materials, technical requirements, test methods, inspection rules, delivery, delivery and acceptance as well as packaging, marking, transportation and storage.
This standard applies to granulated blast furnace slag powder used as cement admixture, mortar and concrete admixture.
2 Normative References
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this document. For undated references, the latest version (including all amendments) applies to this document.
GB175 Universal Portland Cement
GB/T176 Cement Chemical Analysis Method
GB/T203 Granulating Blast Furnace Slag in Cement
GB/T208 Cement Density Determination Method
GB/T1346 Cement Consistency Water Consumption, Setting Time, Stability Test Method
GB/T2419 Cement Mortar Sand Flow Measurement Method
GB/T5483 Natural Plaster
GB6566 Radioactive Nuclides for Building Materials
GB/T8074 Specific Surface Area Determination Method for Cement
GB/T9774 Cement Packaging Bag
GB/T12573 Cement Sampling Method
GB/T17671 Cement Mortar Strength Test Method (ISO method)
GB/T26748 Cement Grinding Aid
GSB08-1337 China ISO Standard Sand
GSB08-3387 Granulated Blast Furnace Slag Powder Fineness and Specific Surface Area Standard Sample
3 Terms and Definitions
For the purpose of this document, the following terms and definitions apply.
3.1
ground granulated blast furnace slag powder
The ground powder with certain fineness with granulated blast furnace slag as the main raw material, in which a small amount of natural gypsum, can be added.
4 Components and Materials
4.1 Slag
Granulated blast furnace slag that meets the requirements of GB/T203.
4.2 Natural plaster
In accordance with those specified in GB/T 5483 G or M Class II (inclusive) or more gypsum or mixed gypsum.
4.3 Grinding aids
In accordance with those specified in GB/T 26748, the added amount is not more than 0.5% of the slag powder quality.
5 Technical Requirements
Slag powder shall meet the requirements of Table 1.
Table 1 Technical Requirement for Slag Powder
Item Level
S105 S95 S75
Density (g/cm3) ≥2.8
Specific surface area (m2/kg) ≥500 ≥400 ≥300
Activity index/% 7d ≥95 ≥70 ≥55
28d ≥105 ≥95 ≥75
Fluidity ratio /% ≥95
Initial setting time ratio/% ≤200
Moisture content (mass fraction)/% ≤1.0
Sulfur trioxide (mass fraction)/% ≤4.0
Chloride ion (mass fraction)/% ≤0.06
Loss on ignition (mass fraction)/% ≤1.0
Insoluble (mass fraction)/% ≤3.0
Vitreous body content (mass fraction)/% ≥85
Radioactivity IRa≤1.0 and Ir≤1.0
6 Test Methods
6.1 Density
In accordance with GB/T208.
6.2 Specific surface areas
According to GB/T8074, the calibration of the Breathe instrument is based on the GSB08-3387 pelletized blast furnace slag powder fineness and specific surface area standard sample or other standard materials of the same grade; in event of any dispute, the former shall prevail.
6.3 Activity index, fluidity ratio and initial setting time ratio
In accordance with Annex A.
6.4 Moisture content
In accordance with Annex B.
6.5 Sulfur dichloride, chloride ions, and insoluble
In accordance with GB/T176.
6.6 Loss of ignition
In accordance with GB/T176.
The error of slag powder caused by sulfide oxidation during the ignition process can be corrected by equations (1) and (2):
w_(o_2 )=0.8×(w_(〖ignited SO〗_3 )-w_(〖non-ignited SO〗_3 )) (1)
Where,
w_(o_2 )- the mass fraction of oxygen absorbed in the air during slag powder ignition, %;
w_(〖ignited SO〗_3 ) – the SO3 mass fraction measured after slag burning, %;
w_(〖non-ignited SO〗_3 ) - the SO3 mass fraction without slag, %.
X corrected = X measured + w_(o_2 ) (2)
Where,
X corrected – the loss of ignition (mass fraction) after slag powder correction, %;
X measured – the loss of ignition (mass fraction) measured by slag powder test, %.
6.7 Vitreous body content
In accordance with Annex C.
6.8 Radioactivity
According to GB6566, the radioactivity test samples were made by mixing slag powder and Portland cement in a mass ratio of 1:1.
1 Scope
2 Normative References
3 Terms and Definitions
4 Components and Materials
5 Technical Requirements
6 Test Methods
7 Inspection Rules
8 Factory Leave, Delivery and Acceptance
9 Packaging, Marking, Transportation and Storage
Annex A (Normative) Determination Method for Activity Index, Fluidity Ratio and Initial Setting Time Ratio of Slag Powder
Annex B (Normative) Determination Method for Moisture Content of Slag Powder
Annex C
(Normative) Determination Method for Vitreous Content of
Slag Powder
