GB/T 18046-2017Ground granulated blast furnace slag used for cement, mortar and concrete (English PDF)

3.1 Ground granulated blast furnace slag powder

It takes ground granulated blast furnace slag as the main raw material, and adds a small amount of natural gypsum, to grind into powder of a certain fineness.

4.1 Slag

Ground granulated blast furnace slag powder that meets the requirements of GB/T 203.

4.2 Natural gypsum

Gypsum or mixed gypsum that meets the requirements above type-G or type-M level-II (included) of GB/T 5483.

4.3 Grinding aids

It meets the requirements of GB/T 26748, and its added amount does not exceed 0.5% of the slag powder mass.

6.1 Density

Perform according to GB/T 208.

6.2 Specific surface area

Perform according to GB/T 8074. For the calibration of the apparatus for Blaine method, uses GSB 08-3387, Ground granulated blast furnace slag powder fineness and specific surface area standard sample or other reference materials of the same grade; the former shall prevail in case of dispute.

6.5 Sulfur trioxide, chloride ion, insoluble matter

Perform according to GB/T 176.

6.6 Loss on ignition

Perform according to GB/T 176.

The error that is caused by sulfide oxidation during the burning of the slag powder can be corrected by Formula (1) and Formula (2).

6.7 Glass content

Perform according to Appendix C.

6.8 Radioactivity

Perform according to GB 6566, where the radioactivity test sample is made by slag powder and Portland cement in a mass ratio of 1:1.

7.1 Batching and sampling

7.1.1 Batching

Slag powder is batched and sampled at the same level before leaving the factory. Each batch number is a sampling unit. The slag powder factory batch number is specified according to the annual production capacity of slag powder single line as. […]

7.1.2 Sampling method

Perform sampling in accordance with the provisions of GB/T 12573. The sampling shall be representative. Continuous sampling can be performed.

Equal samples can also be taken from more than 20 locations, with a total of at least 20 kg.

7.2 Inspection

7.2.1 Factory inspection

The factory inspection items are density, specific surface area, activity index, mobility ratio, initial setting time ratio, water content, sulfur trioxide, loss on ignition, and insoluble matter.

7.2.2 Type inspection

The type inspection items are all the technical requirements of Chapter 5. In any of the following cases, type inspection shall be carried out. […]

7.3 Decision rules

7.3.1 Delivery inspection

7.3.2 Type inspection

7.3.2.1 Products, of which the type inspection result meets the technical requirements in Chapter 5, are qualified.

7.4 Inspection report

The content of the inspection report shall include the batch number, inspection items, the type and amount of gypsum and grinding aids, and other technical requirements that are agreed in the contract.

8.1 Slag powder factory-leaving

Only when the technical specifications and packaging of the slag powder are confirmed to meet the requirements, it can leave the factory.

8.2 Delivery and acceptance

8.2.1 The quality acceptance of the slag powder at the time of delivery can be based on the test results of the physical samples, or the inspection report of the same batch of slag powder by the seller.

8.2.2 When the inspection result of the physical sample is taken as the acceptance basis, the buyer and the seller shall jointly sample and sign the seal before delivery or at the place of delivery.

8.2.3 When the inspection report of the same batch of slag powder from the same production plant is used as the basis for acceptance, the buyer (or the entrusted seller) shall take samples from the same batch of slag powder before delivery or during delivery, and keep it for two months after both parties have jointly signed the seal.

9.1 Packaging

Slag powder can be packaged in bags or in bulk. For those packaged in bags, the net content of each bag is 50 kg, and it must not be less than 99% of the marked weight.

9.2 Marking

The packaging bag shall be clearly marked. the name of the manufacturer, product name, grade, packaging date and batch number. Gypsum-containing slag powder shall also be marked with "gypsum". For those packaged in bulk, cards with the same content as the bag logo shall be submitted.

9.3 Transportation and storage

The slag powder must not be wet and mixed with debris during transportation and storage. […]