This standard specifies the test method for bulk density and true porosity of shaped thermal insulating refractory products. GB/T 2998-2001 Test method for bulk density and true porosity of shaped thermal insulating refractory products GB/T2998-2001 Standard download decompression password: www.bzxz.net

GB/T 2998--2001
This standard is equivalent to the international standard ISO5016:1997 "Determination of bulk density and true porosity of shaped thermal insulating refractory products". This standard mainly makes the following changes to GB/T 2998-1982 "Test method for bulk density and true porosity of shaped thermal insulating refractory products":
——Partial definition:
One day average division value:
Requirements for test specimens;
Requirements for the number of significant digits of test results;--Contents of test report
This standard replaces GB/T29981982 from the date of entry into force. This standard is proposed by the State Metallurgical Industry Bureau. This standard belongs to the National Refractory Standardization Technical Committee. The drafting unit of this standard: Luoyang Refractory Research Institute. The main drafters of this standard: Liu Daye and Zheng Yanghua. This standard was first issued on March 29, 1982. GB/T2998—2001
ISO before
ISO (International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of formulating international standards is usually carried out by ISO's technical committees. If each member body is interested in a project established by a technical committee, it has the right to participate in the work of the committee. International organizations (official or unofficial) associated with ISO can also participate in the relevant work. ISO works closely with the International Electrotechnical Commission (IEC) in all aspects of electrotechnical standardization. The draft international standard adopted by the technical committee shall be submitted to the member bodies for voting, and at least 75% of the votes of the member bodies participating in the voting shall be approved before it can be published as an international standard.
International Standard IS05016 was formulated by ISO/TC33 International Organization for Standardization Technical Committee on Refractories. The first edition (ISO05016:1986) has been technically revised and is now cancelled and replaced by this second edition. 1 Scope
National Standard of the People's Republic of China
Shaped insulating refraetory products-Determination of bulk density and true porosity This standard specifies the test method for bulk density and true porosity of shaped thermal refractory products. 2 Referenced standards
CB/T 2998 2001
eqyISO5016:1997
Replaces GB, T 2998—1982
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid, all versions will be revised, and the parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T2997-2000 Test method for apparent porosity, water absorption, bulk density and true porosity of dense shaped refractory products GB/T5071-1997 Test method for true density of refractory materials 3 Definitions
This standard adopts the following definitions.
3.1 Bulk density (p) bulkdensity
The ratio of the mass of a dry porous material to its total volume. 3.2 Total volume (V.) bulk volume Www.bzxZ.net
The sum of the volumes of solid materials, open pores and closed pores in a porous body. Note 1 Surface roughness affects the accuracy of the total volume determination, thereby affecting the accuracy of the volume density determination. In addition, when the volume of the sample is reduced below a certain limit or the organizational structure (pore size and particles) is too coarse, the bulk density is difficult to measure accurately. 3.3 True density (er) true density
The ratio of the mass of solid materials in a porous body to its true volume. 3.4 True volume true voinme
The volume of solid material in a porous body.
3.5 Open pores
Pores that can be penetrated by the liquid when measured in accordance with GB/T2997. Note 2: These pores are connected to the atmosphere, either directly or through other pores. The surface roughness also affects the accuracy of the open pore volume measurement.
3.6 Closed pores
Pores that cannot be penetrated by liquid when measured in accordance with GB/I2997. 3.7 True porosity (yuan) The ratio of the sum of the volumes of open pores and closed pores in a porous body to its total volume. 3.8 Shaped insulating product shaped insulating product Approved by the State Administration of Quality and Technical Supervision on January 15, 2001 Implementation on June 1, 2001
Shaped products with a true porosity of not less than 45%. 4 Principle
GB/T 2998 —2001
For a dry sample of a specified geometric shape, weigh its mass and measure its basic dimensions. Use these data to calculate its volume density and true porosity using the true density of the sample (obtained by the method specified in GB/T5071). Note 3 The method of micro-determining the mass of the sample by decay or immersion in liquid is not suitable for heat-dependent refractory products, because the organizational structure of thermal insulating refractory products is loose. If the method of measuring the mass of the sample without bubbling is used, it may cause significant errors. The accuracy of the result does not need to be corrected because the weighing is carried out in air rather than in vacuum. 5 Equipment
5.1 Vernier caliper, vernier reading value 0. 05 mms or ruler with scale of 01. 5 mm5.2 Electric heating dry coal drying box, capable of controlling the temperature at 110℃=5C. 5.3 Large scale value 0.1g.
5.4 Dryer,
6 Samples
61 The number of samples (bricks or large blocks) to be tested shall be in accordance with the technical conditions of the product or agreed upon by the parties concerned. 62 If several batches of samples are tested, the number of samples taken from each batch of products shall be the same for statistical calculation. Note 1: The number of samples taken from each batch of products shall be in accordance with the technical conditions of the product or agreed upon by the parties concerned. 6L3 Each sample (brick or test block) shall be rectangular or cubed. The total volume of each sample shall not be less than 500 cm, and the edge length shall not be less than 50 mm. Measure four times along the center line of each pair of opposite faces of the sample, and the difference between each measurement should not exceed 1.0 mm. 6.4 For sawn insulation bricks, as long as the surface is flat and the corresponding faces are parallel, and the parallelism deviation meets the requirements of 6.3, the whole brick can be used as a sample.
7 1 Use a vernier caliper (5.1) to measure the three-dimensional dimensions (length L, width b and thickness d) of each sample to an accuracy of 0.5 mm. Each center line of each sample should be measured four times, and the average value should be calculated. 7.2 Dry the sample in an electric drying oven (5.2) at a temperature of 110°C ± 5°C, and then cool it to room temperature in a dryer (5.4). Weigh the mass of each sample to an accuracy of 0.1g: 7.3 Repeat drying, cooling and weighing the sample until it reaches a constant weight. The sample is dried in an electric drying oven for at least 2 hours. The difference between the two consecutive weighings is not greater than 0.0% of the previous one. This means that the sample has reached 7.4%. If necessary, the true density of the sample is determined in accordance with GB/T5071 to calculate its true porosity. 8 Result calculation
8.1 The total volume V of the sample is calculated according to formula (1) in cmr: Vu-Lbd
where L.ba.
are the length, width and thickness of the sample, cmr, respectively. 8.2 The volume density of the sample is calculated according to formula (2) in g/cm2: P=
where; m\·kilogram mass of the sample
V, total volume of the sample, cm2.
8.3 The volume density is expressed in g/cm2 or kg/m2 and calculated to three significant figures. 8.4 The true porosity of the sample is calculated according to formula (3) and expressed in %: ()
GB/T2998-2001
× 100
Where: 0f True density of the sample measured according to GB/T 5071, g/cm2--Volume density of the sample, g/m2 (see 8.2). 85 The true porosity should be calculated to 0.1%.
9 Test report
The test report should include the following contents:
a) Name of the testing unit;
b) Test personnel;
e) Test date+
d) Implementation standard number, i.e. "tested according to GB/T2998";
[) Name, brand and batch number of the sample;
g) Number of whole bricks or test blocks in each batch of samples;
h) Single value and average value of the test results of each batch of samples. ++peteptt++eere+e(3)
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