GB/T 5072-2023 English PDF (GBT5072-2023)

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GB/T 5072-2023: Refractory products -- Determination of cold compressive strength
GB/T 5072-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 81.080
CCS Q 40
Replacing GB/T 5072-2008
Refractory Products - Determination of Cold Compressive
Strength
[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
and ISO 10059-2.2003 Dense, Shaped Refractory Products - Determination of Cold
Compressive Strength - Part 2.Test with Packing, MOD]
ISSUED ON. DECEMBER 28, 2023
IMPLEMENTED ON. JULY 1, 2024
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 6
2 Normative References... 6
3 Terms and Definitions... 6
4 Principle... 7
5 Instruments and Equipment... 7
6 Method 1.Compressive Strength of Dense Shaped Refractory Products - Referee
Test without Packing... 9
7 Method 2.Compressive Strength of Dense Shaped Refractory Products - Test with
Packing... 12
8 Method 3.Determination of Compressive Strength of Shaped Insulating Products 13
9 Result Calculation... 14
10 Test Report... 15
Appendix A (informative) Comparison of the Structure Numbers of This Document
with Those of ISO 8895.2004, ISO 10059-1.1992 and ISO 10059-2.2003... 16
Appendix B (informative) Technical Differences between This Document and ISO
10059-1.1992, ISO 10059-2.2003 and ISO 8895.2004 and Causes Thereof... 19
Foreword
This document was drafted in accordance with the rules provided in GB/T 1.1-2020
Directives for Standardization - Part 1.Rules for the Structure and Drafting of
Standardizing Documents.
This document serves as a replacement of GB/T 5072-2008 Refractory Products -
Determination of Cold Compressive Strength. In comparison with GB/T 5072-2008, apart
from structural adjustments and editorial modifications, the main technical changes are as
follows.
a) The Scope is modified (see Chapter 1; Chapter 1 of Version 2008);
b) In the Principle chapter, “until it is broken or compressed to 90% of the former
height” is modified to “until it is broken or compressed to 90% of the original
height”; “average cross-sectional area under pressure” is modified to “average
pressure surface area” (see Chapter 4; Chapter 4 of Version 2008);
c) Some requirements for the pressure plate are modified, and the content of the note
is modified to the main text (see 5.1; 5.1 of Version 2008);
d) Technical requirements for the micrometer, triangular plate, feeler gauge and steel
ruler are added, and requirements for the hardened filter paper are also added (see
5.2, 5.4, 5.5, 5.8, 5.9);
e) The sampling and preparation contents of the test sample for the test without
packing are added (see 6.1.1, 6.1.2);
f) The content of the note is modified to the main text (see 6.1.4; 6.1.2 of Version
2008);
g) The requirements for the range of the testing machine during the test are deleted
(see 6.2 and 7.3.3 of Version 2008);
h) The test contents of the amorphous test sample are deleted (see Chapters 7 and 8 of
Version 2008);
i) The sampling and preparation requirements of the test sample for the test with
packing are modified (see 7.2.1 and 7.2.2; 7.2.1 of Version 2008);
j) The size of half a standard brick is added [see 7.2.3 d)];
k) “The test sample shall be cut or drilled from the product, and the pressure surface
of the test sample shall be as parallel as possible and as perpendicular to the
pressure direction as possible.” is deleted (see 7.2.4 of Version 2008);
l) The area size of the packing plate is modified (see 7.3.2; 7.3.2 of Version 2008);
Refractory Products - Determination of Cold Compressive
Strength
1 Scope
This document specifies the principle, instruments and equipment, test samples, test steps,
result calculation and test report of the determination of cold compressive strength for
refractories.
This document is applicable to the determination of cold compressive strength for dense
shaped refractory products and shaped insulating products.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in the text. In terms of references with a specified date,
only versions with a specified date are applicable to this document. In terms of references
without a specified date, the latest version (including all the modifications) is applicable to
this document.
GB/T 7321 Sample Preparation for Testing of Shaped Refractory Products
GB/T 8170 Rules of Rounding off for Numerical Values and Expression and Judgement of
Limiting Values
GB/T 10325 Shaped Refractory Products - Sampling and Acceptance Testing (GB/T
10325-2012, ISO 5022.1979, NEQ)
GB/T 18930 Terminology for Refractories (GB/T 18930-2020, ISO 836.2001, MOD)
3 Terms and Definitions
The terms and definitions defined in GB/T 18930 and the following ones are applicable to
this document.
3.1 Cold Compressive Strength
The ultimate pressure per unit area that a refractory can withstand before it is damaged when
pressurized under specified conditions at room temperature.
[Source. 2.5.10 of GB/T 18930-2020].
3.2 Dense Shaped Refractory Product
A refractory product with a true porosity of less than 45% and a certain size.
[Source. 2.2.26 of GB/T 18930-2020].
3.3 Shaped Insulating Product
A shaped refractory with a true porosity of not less than 45%.
[Source. 2.2.56 of GB/T 18930-2020].
4 Principle
Under specified conditions, a load is applied to a test sample of known size at a constant
pressure rate until it is broken or compressed to 90% of the original height, and the
maximum load is recorded. The cold compressive strength is calculated based on the
maximum load and the average pressure surface area of the test sample.
5 Instruments and Equipment
5.1 Compression Testing Machine
A device capable of measuring the pressure applied to the test sample shall be equipped,
with an indication error within ±2%. The testing machine shall be able to apply load evenly
at a specified rate. The range of the testing machine shall meet the requirement that the
expected breaking load value applied to the test sample is greater than 10% of the force
sensor range.
The pressure plate of the testing machine shall meet the following requirements.
a) The Rockwell hardness is greater than 58 HRC;
b) The flatness error of the contact surface with the test sample is 0.03 mm;
c) The surface roughness (average roughness value Ra) is 0.8 μm ~ 3.2 μm.
Both pressure plates of the testing machine shall be ground. The upper pressure plate shall
be mounted on a spherical seat to compensate for the slight deviation between the
parallelism of the test sample and the pressure plate. The lower pressure plate shall be
engraved with marks to facilitate the placement of the test sample in the center of the
pressure plate. When the bearing surface size (diameter or side length, see 6.1.3 and 7.2.3) of
the test sample is less than 50 mm, the area of the upper pressure plate should not exceed
100 cm2.When the size of the upper pressure plate does not meet the above requirements of
the testing machine, an auxiliary test sample adapter (see Figure 1) can be used in
conj...