This standard specifies the method for determining the flexural strength of dense and insulating shaped refractory products at room temperature by applying stress at a constant rate. This method is mainly used for shaped fired refractory materials. If used for chemically bonded or tar-bonded bricks, these products must undergo some form of preheating. The specific provisions of this preheating treatment are beyond the scope of this standard and must be agreed upon by the relevant parties and stated in the test report. GB/T 3001-2000 Test method for flexural strength of shaped refractory products at room temperature GB/T3001-2000 standard download decompression password: www.bzxz.net

GB/T 3001~-2000
This standard is equivalent to the international standard ISO5014:1997 Test method for flexural strength of dense and heat-insulating shaped refractory products at room temperature, and amends the national standard GB/T3001-1982. Compared with ISO5014:1997, this revision has the following differences: - Add the provisions on the size of the sample of the heat-insulating product; - Add the supplementary explanation on the sample preparation method; - Add the supplementary explanation on the drying of the sample; - Add the provisions on the number of digits to be retained in the calculation result; - Add the drying temperature in the test report.
This revision makes the following changes to GB/T3001-1982: Change the scope of application, excluding amorphous refractory materials; "- Change the loading device and the distance between the lower blade:.- Change the provisions on the number of specimens
*- Change the specimen size and the allowable tolerance
Add the provisions on the drying temperature!
:- Change the loading rate,
:-· Change the result expression!
· Change the content of the test report.
This standard replaces GB/T3001-1982% Test method for flexural strength of refractory products at room temperature from the date of implementation. The technical standard is proposed by the State Metallurgical Industry Bureau. This standard is under the jurisdiction of the National Technical Committee for Standardization of Refractory Materials. This standard was drafted by the Luoyang Refractory Materials Research Institute. The main drafters of this standard are: Zhao Jianli, Zhang Yi, and Li Shaoqi. This standard was first issued in 1982, and this revision is the first revision. GB/T 3001-2000
ISO Foreword
ISO (International Organization for Standardization) is a joint organization of ISO members (members) with an international scope. International standards are usually formulated by ISO's technical committees for standardization. Each member country has the right to participate in the activities of the professional technical committees in which it is interested. International organizations, governments and non-governmental organizations associated with ISC can also participate in this work. ISO has a close cooperative relationship with the International Electrotechnical Commission (IEC) in all aspects of electrotechnical standardization. The draft international standards adopted by the technical committee must be voted by the members, and 75% of the votes must be cast before they can be published as international standards. The international standard ISO5014 was formulated by ISO/TC33 Refractory Technical Committee. The second edition of this standard has made technical revisions to the first edition (IS05014:1986) and replaced the first edition. 1 Scope
National Standard of the People's Republic of China
Test method for the flexural strength of shaped refractory products at room temperature Shaped refractory praducts-Determinationof modulus of rupture at amblent temperatreGB/F 3001-2000
eqvIS05014:1997
replaces G13/T3001-1952
This standard specifies the method for determining the flexural strength of dense and insulating shaped refractory products at room temperature by applying stress at a constant rate. This method is mainly used for shaped fired refractory materials. If used for chemically bonded or tar-bonded bricks, these products must undergo some form of preheating treatment. The specific provisions of this preheating treatment are beyond the scope of this standard and must be agreed upon by the relevant parties and stated in the test report. 2 Cited standards
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 standards are subject to revision, Parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T8170—1987 Specification for numerical revision
GB/T10325—1988 Specification for stacking, sampling, acceptance, storage and transportation of refractory products 3 Definitions
This standard adopts the following definitions.
Flexural strength moduiusofrupture
The maximum stress that a rectangular specimen of specified size can withstand on a three-point bending device. 4 Processing
At room temperature, stress is applied to the specimen at a constant loading rate until it breaks. 5 Equipment
5.1 Loading device (see Figure 1)
Approved by the State Administration of Quality and Technical Supervision on November 17, 2000, June 2001 01 Implementation
Pressure surfacewww.bzxz.net
GB/T3001—2000
1/21±2
Supporting blade
Figure Loading device and specimen size
Specimen
Middle support block
Connection date
5.1.1 The loading device shall have three blades, the lower two blades support the specimen, and the upper blade loads. The radius of curvature of the three blades is listed in Table 1, and the length of the blades shall be at least 5mm greater than the width of the specimen. The edge lines of the three blades shall be parallel to each other, and the blades shall be perpendicular to the side of the specimen when loading. The loading blades on the upper side are fixed, and the two lower blades shall be located on the middle support block. The bottom surface of the middle support block is cylindrical to ensure that the blades are in linear contact with the specimen. Alternatively, one lower blade can be fixed, and the other lower blade and the upper blade can be adjusted on the vertical surface. The distance between the two blades is shown in the table! The upper blade is located between the two lower blades, with a deviation within 2mm. 5.1.2 The full-filling wing can be used to uniformly add medicine to the sample at a constant rate, and there is an instrument that can record or indicate its breaking load, and the indication error should be less than ±2%. The maximum load measured is not less than 10% of the range. 5.2 Electric heating blast drying box can be controlled at (110 ± 5) ℃. 6 Test specimens
6. 1 Quantity
6.1.1 The number of test specimens shall be determined in accordance with the provisions of GB/T10325 or by agreement between relevant parties. 6.1.2 If the specimens are cut from bricks, the number of specimens cut from each brick shall be the same for statistical analysis. Note: The number of specimens cut from each sample (detailed provisions exceed the scope of this standard) shall be determined by agreement between relevant parties and indicated in the test report. 6.2 Shape and size
The standard specimen size is 230 mm × 114 mm × 65 mm or 230 mm × 114 mm × 75 mm. Other sizes listed in Table 1 may also be used.
Specimen size
230×114×85
230×114X75
200X40X40
150×25×25
GB/T 3001--2000
Table! Specimen size, allowable deviation and knife edge regulations 6 and height allowable deviation of force Note 1 It is recommended to use standard bricks for thermal insulation products Parallelism between opposite sides of the machine section Allowable deviation of parallelism between the top and bottom surfaces Allowable deviation of cover 6.3 The compressive direction of the specimen shall be parallel to the pressure direction of forming and shall be indicated on the force surface. If the specimen is cut from a brick, an original brick surface perpendicular to the pressure direction of the brick during forming shall be retained as the pressure surface, rmm Upper and lower radius of curvature t5 ±0. 5 Note: It is recommended to use a continuous flange diamond blade for cutting. If the toothed flange blade is used, the blade cuts the edge and is damaged. It is recommended that the surface of the blade enter the tension surface.
6.4 If the forming and pressing direction is unknown or the specimen that meets the requirements (see 6.2 and 6.3) cannot be obtained in this pressing direction, the sample preparation method should be agreed upon by the parties concerned.
7 Test procedure
7.1 Dry the specimen in a drying oven (52) at (110 ± 5) °C to a minimum and cool it to room temperature in a drying oven. Note: For specimens that are not suitable for drying at (110 ± 5) °C, the drying conditions should be agreed upon by the parties concerned. 7.2 Measure the width and height of the specimen at the middle part to the nearest 0.1 mm1 and the distance between the lower blades to the nearest 0.5 mm. 7.3 Place the specimen symmetrically on the lower blade of the loading device (5.1) as required (6.3). 7.4 Apply load to the specimen at room temperature until it breaks, the rate of loading is: 1) Compact shaped refractory products:
0.15 MPa/s±0.015 MPa/s.
b) Shaped insulating refractory products:
[3.05 MPa/s-0,005 MPa/s:
7.5 Record the load (Fmk) when the specimen breaks and the temperature during the test. 8 Result expression
8.1 Room temperature flexural strength is calculated by formula (1): Re-
Where Re is room temperature flexural strength, MPa; Fak is the maximum force applied to the specimen, N; Fak is the distance between the upper and lower ends, nm
5 is the width of the specimen + mm; h is the height of the specimen, mm.
3 × FmkLs
8.2 For whole bricks, the measured value of one brick is the result of this sample brick. 8.3 For the cut samples, record the single value and the average value of all samples, and use these values ​​to express the result of this sample. 8.4 The result is retained to one decimal place, and the numbers after the decimal place are processed according to the numerical rounding rules of GB/T8170. -( 1
9 Test report
The test report includes the following contents:
a) Commissioning unit;
b) Test items;
c) Test date:
GB/T 3001--2000
d) Implementation standard, that is, the test is carried out in accordance with GT3/T30012000": e) Identification of the test brick (manufacturer, variety, brick type, batch number): f) Name and quantity of the test sample and the number of test specimens: g) Whether the sample has been pretreated (see Section 1): h) Test drying temperature:
i) Sample size;
When more than one test brick is cut from each sample, the single value and average value of the flexural strength of each sample in each sample; when the whole brick is tested, the value of the demolition strength of each sample is 17bzw.cn熊种饮干黑
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