This standard specifies the arbitration test method for the compressive strength of dense shaped refractory products at room temperature without lining. GB/T 5072.1-1998 Test method for compressive strength of dense shaped refractory products at room temperature without lining arbitration test GB/T5072.1-1998 Standard download decompression password: www.bzxz.net

GB/T5072.1--1998
This standard is equivalent to ISO10059-1:1992 "Compact shaped refractory products-Determination of compressive strength at room temperature-Part 1: Unlined refractory arbitration test".
This standard is an arbitration test method without any lining material, and GB/T5072--1985 is an arbitration test method with lining materials.
Shaped insulating refractory products are tested according to GB/T3997.2-1998. This standard is proposed by the Ministry of Metallurgical Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for the Promotion of Refractory Standards. The drafting unit of this standard: Luoyang Refractory Research Institute of the Ministry of Metallurgical Industry. The main drafters of this standard: Li Shaoqi, Li Yonggang, and Zhu Lihui. 139
GB/T 5072.1—1998
ISO Foreword
ISO (International Organization for Standardization) is a worldwide international standards association (ISO member). International standards are usually developed by ISO technical committees. Member countries interested in a project that has been determined by the technical committee have the right to accept the commission of the technical committee. International organizations, whether governmental or non-governmental, that have liaison with ISO may also participate in this work. ISO works closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
Before being confirmed as an international standard by the ISO committee, the draft international standard to be adopted by the technical committee should be voted on in a circular manner in the member countries. According to ISO procedures, at least 75% of the member countries need to vote in favor to pass. International standard ISO10059.1 was developed by ISO/TC33 SC2 Technical Committee on Refractories. ISO10059 Determination of compressive strength of dense shaped refractory products at room temperature, including the following parts: Part 1: Arbitration test without lining
Part 2: Liner test
GB/T5072.1—1998
ISO Introduction
ISO10059 includes two parts. Part 1 is an arbitration test method for determining compressive strength without using any lining material. Part 2 is a recommended test method using lining and recommends the usable sample size. Shaped insulating refractory products are measured according to ISO8895. 141
1 Scope
National Standard of the People's Republic of China
Dense, shaped refractory products
Test method for cold compressive strength at room temperature
Referee test without packing
Dense, shaped refractory products-Determination of cold compressive strengthPart 1: Referee test without packing This standard specifies the reference test method for cold compressive strength of dense shaped refractory products without packing. 2 Referenced standards
GB/T 5072. 1—1998
idt ISO 10059-1:1992
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 will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T2997--1982 Test method for apparent porosity, water absorption, bulk density and true porosity of dense shaped refractory products GB/T3997.2-1998 Test method for compressive strength of shaped insulating refractory products at room temperature 3 Definitions
This standard adopts the following definitions.
3.1 Compressive strength at room temperature: the maximum load per unit area that a refractory product can withstand before failure when a load is applied at a specified pressure rate at room temperature.
3.2 Dense shaped refractory products: refractory products with a true porosity of <45% as specified in GB/T2997. 4 Principle
Under specific conditions, a load is applied to a sample of known size at a constant pressure rate until it breaks, that is, the sample can no longer withstand further stress. The compressive strength at room temperature is calculated based on the maximum pressure and the average cross-sectional area under pressure when the sample breaks. 5 Equipment
5.1 The mechanical or hydraulic pressure testing machine shall be equipped with a device capable of measuring the pressure value applied to the specimen, with the indication error within 2%. The testing machine shall be able to apply stress at a rate of 1.0 N/(mm2~s) ± 0.1 N/(mm2·s) until the specimen is broken. The pressure plate of the testing machine shall meet the following requirements:
a) Luke's hardness 58HRC~62HRC,
b) The flatness error of the contact surface with the specimen is 0.03mm; c) The surface roughness (average roughness value Ra) is 0.8~3.2μm (the average roughness refers to the plane grinding standard, and is detected by touch method or naked eye observation method).
Approved by the State Administration of Quality and Technical Supervision on December 7, 1998 142
Implemented on July 1, 1999
GB/T5072.1—1998
The area of ​​the upper platen should not exceed 100 cm2 and should be equipped with a spherical support that can compensate for slight deviations between the specimen and the platen. For testing machines whose upper platen dimensions do not meet the above requirements, an auxiliary specimen adapter (see Figure 1) can be used and installed in the center of the upper and lower platens of the testing machine. The adapter platen should meet the requirements specified in a) to c) and have a thickness of at least 10 mm. Note 1: The platen should be replaceable so that it can be mechanically reprocessed to ensure that its surface meets the above requirements. Pressure transmission rod
Spherical seat
Upper pressure plate
Steel frame
$55110
Figure 1 Sample adapter
5.2 Vernier caliper, used to measure the sample (see 6.3, 6.4 and 7). 5.3 Triangular plate.
5.4 Drying oven: temperature can be controlled at 110℃±5℃. 6 Sample
Lower pressure plate
6.1 The sample is a cylinder with a diameter of 50mm±0.5mm and a height of 50mm±0.5mm. If the size of the sample cannot meet this requirement, a cylinder with a diameter of 36mm±0.3mm and a height of 36mm±0.3mm can also be used. 6.2 The sample should be drilled from the pressure surface of the product. The original position of the sample in the product should be recorded when preparing the sample. Those samples with cracks or obvious defects should be recorded and discarded.
The pressure surfaces at both ends of the cylindrical specimen should be ground flat and kept parallel to each other. To ensure the flatness of the upper and lower pressure surfaces of the specimen, press each end face one by one on a horizontal plate lined with carbon powder or blue printing paper and hard filling paper (0.15mm thick) with a pressure of 3kN ± 1kN. If the pressure surface impression is incomplete or unclear, re-grind it (see Figures 2 to 5). a) Coarse-grained bricks
b) Fine-grained bricks
Figure 2 Black or blue carbon paper impression of qualified specimens 143
GB/T5072.1—1998
Note 2: A steel straight gauge can be used to assist in checking the surface, and the surface must not be smoothed with fire clay. 6.3 The parallelism of the specimen is checked by measuring the height values ​​of 4 points. The measuring points are located at the two ends of two mutually perpendicular diameters. The height difference between any two measuring points should not exceed 0.2 mm.
6.4 Place the sample on a plane and use the right-angled side of the triangle to check the verticality of the sample at the four measuring points of the measuring height. The gap between the sample and the triangle should not exceed 0.5 mm. 6.5 Place the prepared sample in a drying oven at 110℃±5℃ and dry to constant weight. Then cool to room temperature and prevent moisture before testing. 7 Test steps
Measure the two diameters of the two pressure-bearing surfaces of the sample that are perpendicular to each other, accurate to 0.1mm. Calculate the initial cross-sectional area Ao based on the arithmetic mean of the lengths of the four diameters.
Install the sample or the adapter with the sample installed at the center of the upper and lower pressure plates of the testing machine. No cushioning material is used between the sample and the pressure plate.
Select the load range so that it is greater than 10% of the estimated failure load value of the sample. Apply pressure continuously and evenly at a loading rate of 1.0N/mm2·s）±0.1N/(mm\·s) until the sample breaks, that is, the sample can no longer withstand further pressure growth. Record the maximum load indicated. Note 3: The curve of applied load versus time can be used to represent the test results. a) Coarse-grained brick
b) Fine-grained brickbZxz.net
Figure 3 Black or blue carbon paper imprint of basically qualified samplesa) Coarse-grained brick
b) Fine-grained brick
Figure 4 Black or blue carbon paper imprint of unqualified samples144
8 Result calculation
GB/T 5072.1—1998
Figure 5 Black or blue carbon paper impression of unqualified specimen: There are obvious grooves in the impression. The room temperature compressive strength α of the specimen is in N/mm2 and is calculated by the following formula: Fra
Where: Fmax\-the maximum load recorded, N; A. 一一the initial end area of ​​the specimen under pressure, mm\; The calculation result is retained to 3 significant figures.
Note 4: Repeatability and reproducibility data are still being drafted. 9 The test report
should include the following parts:
a) testing unit;
b) test date;
c) implementation standard: GB/T5072 "Test method for compressive strength of dense shaped refractory products at room temperature - arbitration test without lining";
d) description of the test material (producer, brand, batch number, etc.);
e) number of samples;
f) number of specimens drilled from each sample;
g) size of the specimen (see 6.1);
h) sampling location and its relationship with the pressing direction (see 6.2);1) location of defective specimens (see 6.2);
i) strength value of each specimen;
k) average strength value of each specimen (different from item j);1) average strength value of the batch of samples.
Note 5: The dispersion of the room temperature compressive strength value includes the dispersion between a batch of brick samples and the dispersion between the individual specimens drilled from the brick sample. These dispersions depend on the material and manufacturing process of the brick sample and the repeatability and reproducibility of the test method. Once the repeatability and reproducibility values ​​are determined, it should be noted that both the individual values ​​of all the specimens and the average value calculated from the individual values ​​of the specimens on a brick sample are valid. 145
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