JG/T 223-2017Polycarboxylates high performance water-reducing admixture (English PDF)

4.1 Classification

4.1.1 The classification by product type is as shown in Table 1.

reducing admixture to be tested.

5.1.2 Mix ratio

In accordance with JGJ 55, perform the mix ratio design for the reference

concrete. The ratio of cement, gravel, and aggregate for the tested concrete

and the reference concrete is same. The design of mix ratio shall comply with

the following provisions.

- Cement consumption. 360 kg/m3;

- Gravel ratio. 43% ~ 47%;

- Dosage of polycarboxylates high performance water-reducing admixture.

Use the dosage as specified by the manufacturer of polycarboxylates high

performance water-reducing admixture;

- Water consumption. The initial slump of the tested concrete which is added

with slow-release admixture shall be controlled at (120 ± 10) mm; the initial

slump of the tested concrete which is added with other types of products

shall be controlled at (210 ± 10) mm; the initial slump of the reference

concrete shall be controlled at (210 ± 10) mm; the water consumption is the

minimum water consumption when the initial slump of the reference

concrete and the tested concrete reaches the corresponding control value;

the water consumption includes the water which is contained in the water-

reducing admixture, gravel, and aggregate material.

5.1.3 Concrete mixing

It is performed in accordance with the provisions of GB 8076.

5.1.4 Production of specimens

The production of concrete specimens which is added with antifreeze product

shall be carried out in accordance with the provisions of JG/T 377. The

preparation of concrete specimens which is added with other types of products

shall be carried out in accordance with the provisions of GB 8076.

5.1.5 Test items and number of specimens

The number of test items and the number of specimens is shown in Table 3.

It is performed in accordance with the provisions of GB 18588.

6.2 Concrete performance

6.2.1 Water reduction ratio, bleeding rate ratio, difference of set time and

shrinkage ratio

The test methods of the water reduction ratio, bleeding rate ratio, difference of

set time and shrinkage ratio shall meet the following requirements.

- The water reduction ratio test of the polycarboxylates high performance

water-reducing admixture is carried out in accordance with the provisions

of GB 8076, the initial slump of the tested concrete which is added with the

slow-release product is controlled at (120 ± 10) mm, meanwhile the 1 h, 2

h, and 3 h slump loss over time shall comply with the requirements of Table

4;

- The bleeding rate ratio, the difference of set time, and the shrinkage ratio

are tested in accordance with the provisions of GB 8076.

6.2.2 Gas content, slump, slump loss over time

It is performed in accordance with the provisions of GB/T 50080.

6.2.3 Compressive strength ratio

The test method for the compressive strength ratio shall meet the following

requirements.

- The compressive strength ratio test of antifreeze products is carried out in

accordance with the provisions of JG/T 377;

- The compressive strength ratio test of other types of products is carried out

in accordance with the provisions of GB 8076.

6.2.4 Strength loss ratio after 50 freeze-thaw

It is performed in accordance with the provisions of JG/T 377.

7.1 Inspection classification

7.1.1 Exit-factory inspection

The exit-factory inspection items shall include formaldehyde content, chloride

ion content, total alkali content, solid content, moisture content, density,

fineness, pH value. The chloride ion content is tested at least once every 3

inspection.

7.3 Judgment rules

7.3.1 Judgment of exit-factory inspection

If the type inspection qualified report is within the validity period, the exit-factory

inspection result meets the requirements of Table 4, this batch of products is

judged to be qualified.

7.3.2 Judgement of type inspection

The qualification judgement for the product's type inspection shall meet the

following requirements.

a) The product has been tested and the homogeneity test results shall

comply with the requirements of Table 4;

b) All concrete performance index's test results of antifreeze products shall

meet the requirements of Table 5, Table 6 and clause 5.4;

c) Except that the difference of set time in the concrete performance index of

other types of product is used as the reference index, the test results of

other performance indicators shall comply with the requirements of Table

7.4 Re-inspection

The re-inspection is carried out by using the retained sample. If the user

organization requires on-site sampling, it shall be specified in the supply

contract in advance. Take the mixed sample on site in the presence of the

personnel of production and user organization. The re-inspection shall be

carried out in accordance with the type inspection items.

8.1 Product specification

It shall provide the product specification when the product is exit-factory. The

product specification shall include at least the following contents.

a) The name of the manufacturer;

b) The name and type of the product;

c) The product performance characteristics, main components and technical

indicators;

d) The scope of application;

e) The recommended dosage;

f) Storage conditions and validity period, the validity period is calculated from

the date of production, which is specified by the enterprise itself in

accordance with the product performance;

g) The methods of use, precautions, safety precautions, etc.

8.2 Certificate

It shall provide the product certificate when the product is delivered. The product

certificate shall include at least the following contents.

a) The product name;

b) The date of manufacture and batch number;

c) The name and address of the production unit;

d) The conclusions of exit-factory inspection;

e) Enterprise's quality inspection seal or quality inspection personnel's

signature, code.

8.3 Packaging

Powder products can be packaged in woven bags or paper bags lined with

plastic bags, or other packaging that can be agreed upon by the supplier and

the purchaser; liquid products can be contained in plastic containers or in tank

cars. The packaging containers shall be indicated of the product name and type,

implemented standard number, trademark, net mass, production unit's name

and validity period in an obvious position.

9.1 Exit-factory

The contents of the cargo-accompanied technical documents provided by the

manufacturer include. product specification, certificate, inspection report. Under

one of the following conditions, it shall not exit factory.

a) The technical documents (product specifications, certificates, inspection

reports) are incomplete;

b) The packaging is inconsistent;

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