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GB/T 5072-2008 English PDF (GBT5072-2008)

GB/T 5072-2008 English PDF (GBT5072-2008)

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GB/T 5072-2008: Refractories -- Determination of cold compressive strength

This standard specifies the definition, principle, equipment, sample, test procedure, result calculation and so on of the determination of cold compressive strength of refractories.
GB/T 5072-2008
GB
ICS 81.080
Q 40
NATIONAL STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
Replacing GB/T 5072.1-1998, GB/T 5072.2-2004, GB/T 3997.2-1998
Refractories ?€?
Determination of cold compressive strength
(ISO 8895.2004, ISO 10059-1.1992 and ISO 10059-2.2003, MOD)
ISSUED ON. JUNE 26, 2008
IMPLEMENTED ON. APRIL 01, 2009
Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China;
Standardization Administration of the PRC.
Table of contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 Principles ... 6
5 Equipment and materials ... 6
6 Method 1 - Dense shaped refractory products compressive strength test method without packing (Arbitration method) ... 8
7 Method 2 - Dense refractory materials compressive strength test method with packing ... 10
8 Method 3 - Insulating refractory material compressive strength test methods ... 12
9 Result calculation ... 14
10 Test report ... 15
Appendix A (Informative) Clause number comparison between this standard AND ISO 8895, ISO 10059-1 and ISO 10059-2 ... 16
Appendix B (Informative) The technical differences between this standard and ISO 8895, ISO 10059-1 and ISO 10059-2 AND their causes ... 17
Foreword
This standard, through modification, adopts ISO 8895.2004 ?€?Shaped insulating refractory products - Determination of cold crushing strength?€?, ISO 10059- 1.1992 ?€?Dense shaped refractory products - Determination of cold compressive strength - Part 1. Referee test without packing?€? (English), AND ISO 10059- 2.2003 ?€?Dense shaped refractory products - Determination of cold compressive strength - Part 2. Test with packing?€? (English).
This standard was redrafted in accordance with ISO 8895.2004, ISO 10059- 1.1992 and ISO 10059-2.2003. Appendix A provides a list of the clause number differences between this standard and the ISO standard. Appendix B provides the technical differences and causes between this standard and ISO standards. The relevant technical differences have been identified by a vertical single line in the margins of the clauses covered by the standard.
This standard is, from the technical content, exactly same as ISO 8895.2004, ISO 10059-1.1992 and ISO 10059-2.2003. The main differences between this standard and the above standards are as follows.
- COMBINE the contents of ISO 8895.2004, ISO 10059-1.1992 and ISO
10059-2.2003 and COMPILE the standard in chapters;
- EXTEND the scope of application from the shaped refractory products into refractory materials;
- MODIFY the reference to the corresponding international standards into the corresponding Chinese standards;
- ADD the information of unshaped refractory materials;
- ADD Appendix A and Appendix B.
This standard replaces GB/T 5072.1-1998 ?€?Dense, shaped refractory products - Determination of cold compressive strength - Part 1. Referee test without packing?€?, GB/T 5072.2-2004 ?€?Dense, shaped refractory products -
Determination of cold compressive strength - Part 1. Test with packing?€? and GB/T 3997.2-1998 ?€?Shaped insulating refractory products - Determination of cold crushing strength?€?.
As compared with GB/T 5072, the main changes of this standard are as follows. - COMBINE some contents of GB/T 5072.1-1998, GB/T 5072.2-2004, GB/T
3997.2-1998, YB/T 5118-1993 and YB/T 5201-1993 and COMPILE the
standard in chapters;
Refractories ?€?
Determination of cold compressive strength
1 Scope
This standard specifies the definition, principle, equipment, sample, test procedure, result calculation and so on of the determination of cold
compressive strength of refractories.
This standard is applicable to the determination of cold compressive strength of dense and insulating refractory materials.
2 Normative references
The provisions in following documents become the provisions of this Standard through reference in this Standard. For the dated references, the subsequent amendments (excluding corrections) or revisions do not apply to this Standard; however, parties who reach an agreement based on this Standard are
encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies. GB/T 10325 Shaped refractory products - Rule of acceptance, sampling and inspection
3 Terms and definitions
The following terms and definitions apply to this standard.
3.1
Cold compressive strength
It refers to the ultimate pressure bearable by the refractory material per unit area under normal temperature before being damaged if the pressure is
applied in accordance with the specified conditions.
3.2
Dense shaped refractory product
It refers to the refractory products of a specific size with the true porosity of less than 45%.
3.3
Shaped insulating refractory product
It refers to the refractory products with the true porosity of not less than 45%. 3.4
Unshaped refractory
It refers to the bulk refractory materials mixed by aggregate, fine powder and binder. If necessary, it may add the admixtures.
4 Principles
Under specified conditions, APPLY load to the a test specimen of known size at a constant pressing rate, until the test specimen is broken or compressed to 90% of its original size; RECORD the maximum load. Based on the maximum load bearable by the test specimen AND the average compressive cross-
sectional area, CALCULATE the cold compressive strength.
5 Equipment and materials
5.1 Mechanical or hydraulic pressure testing machine
It is equipped with the device which can determine the pressure applied to the test specimen, with the indication error within ?? 2%. The testing machine shall be capable of applying a uniform stress at a specified rate. The measurement range of the testing machine shall ensure that the maximum stress applied to the test specimen is greater than 10% of the measurement range.
The pressing plate of the testing machine shall comply with the following requirements.
a) Rockwell hardness 58 HRC ~ 62 HRC;
b) The flatness error of the surface contact with the sample is 0.03 mm; c) The surface roughness (average roughness value Ra) is 0.8 ??m ~ 3.2 ??m (average roughness making reference to the plane grinding standard,
measured by touching or naked eye observation).
5.5 Liner plate, which is the thickness of 3 mm ~ 7 mm non-corrugated
paperboard or cardboard.
5.6 The triangular plate.
5.7 Feeler gauge.
5.8 Steel ruler.
6 Method 1 - Dense shaped refractory products
compressive strength test method without packing
(Arbitration method)
6.1 Test specimens
6.1.1 The test specimen shall be a cylinder with a diameter of 50 mm ?? 0.5 mm and a height of 50 mm ?? 0.5 mm. If the size of the test specimen cannot meet this requirement, it may also use the cylinder with a diameter of 36 mm ?? 0.3 mm and a height of 36 mm ?? 0.3 mm.
6.1.2 The test specimen shall be drilled from the formed compressive surface of the product. When preparing the sample, it shall record the original location of the test specimen in the product. The test specimen with cracks or apparent defects shall be recorded AND discarded.
The compressive surface at both ends of the cylindrical test specimen shall be ground flat AND kept parallel. To ensure the flatness of the upper and lower compressive surfaces of the test specimen, consecutively PRESS each end surface onto the horizontal plate backed by carbon paper and hard filter paper (0.15 mm thickness) at the pressure force of 3 kN ?? 1 kN; if the pressing mark is incomplete or not clear, it shall be re-ground (Figure 2 ~ Figure 5). Note. It may use the steel ruler to support the surface inspection; it is not allowed to use fire mud to smear the surface.
6.1.3 The parallelism of the test specimen shall be checked by measuring the height of 4 points. The measurement points are located at two diametrically opposite ends perpendicular to each other. The difference between the height of any two measurement points shall not exceed 0.2 mm.
6.1.4 PLACE the test specimen on a flat surface; USE the square edge of the triangle plate to check the perpendicularity of the test specimen at the 4 This method is used for daily quality control BUT not used to test the true value of cold compressive strength; it shall use the method 1 of this standard to test the true value of the cold compressive strength.
Note 1. This method cannot directly compare the test results of different size samples.
Note 2. The test results of this method cannot be directly compared with those of method 1 of this standard.
7.2 Test specimens
7.2.1 When the sample is a standard brick or the volume of the sample is ??? 2000 cm3, it shall take 1 tes...

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