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GB/T 3001-2007 English PDF (GBT3001-2007)

GB/T 3001-2007 English PDF (GBT3001-2007)

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GB/T 3001-2007: Refractory products -- Determination of modulus of rupture at ambient temperature

This Standard specifies a method for the determination of the modulus of rupture of refractory products at ambient temperature, under conditions of a constant rate of increase of stress.
GB/T 3001-2007
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 81.080
Q 40
Replacing GB/T 3001-2000
Refractory products ?€? Determination of modulus of
rupture at ambient temperature
(ISO 5014.1997, Dense and insulating shaped refractory products ?€?
determination of modulus of rupture at ambient temperature, MOD)
ISSUED ON. DECEMBER 14, 2007
IMPLEMENTED ON. JUNE 1, 2008
Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Definition ... 5
4 Principle... 6
5 Apparatus ... 6
6 Test pieces ... 7
7 Procedure ... 9
8 Expression of results ... 10
9 Test report ... 10
Annex A (Informative) Comparison of the paragraph numbers between this
Standard and ISO 5014.1997 ... 12
Annex B (Informative) Technical differences between this Standard and ISO 5014.1997 and their reasons ... 13
Foreword
This Standard was drafted by modifying and adopting ISO 5014.1997, Dense and insulating shaped refractory products ?€? Determination of modulus of rupture and ambient temperature (English version). Annex A gives the list comparing the paragraph numbers between this Standard and ISO 5014.1997. Table B.1 gives the list of the technical differences between this Standard and ISO 5014.1997 and their reasons. The technical differences are marked with vertical single line in the page margin of the provisions concerned in this Standard. The main modifications are as follows. -- it modifies the name of the standard;
-- it adds the test pieces of fired refractory materials and extends the application scope of the standard;
-- it adds reference standards;
-- it adds Vernier caliper in Apparatus;
-- it adds the provision on the dimensions and deviations of fired refractory materials; -- it adds the provision on preparation of test pieces of fired refractory materials; -- it adds the supplementary instructions to dying of test pieces;
-- it changes the dimensions of standard bricks into the dimensions of Chinese standard bricks;
-- it adds the provision on the dimensions of special test pieces;
-- it adds the provision on the decimal place rounded off to of test results; and -- it adds in the test report the conditions of drying or pretreatment of fired refractory materials and the content of expression of results.
This Standard replaced GB/T 3001-2000, Shaped refractory products ?€? Determination of modulus of rupture at ambient temperature; and compared with GB/T 3001-2000, the main technical changes are as follows.
a) this Standard incorporates some content of the method for the determination of modulus of rupture of other refractory materials at normal temperature; and b) it adds the provision on the dimensions of special test pieces.
Annex A and Annex B of this Standard are informative.
Refractory products ?€? Determination of modulus of
rupture at ambient temperature
1 Scope
This Standard specifies a method for the determination of the modulus of rupture of refractory products at ambient temperature, under conditions of a constant rate of increase of stress.
The method relates primarily to shaped and fired refractories. If it is to be applied to chemically bonded or tar-bonded bricks, they will usually require some form of preliminary heat treatment. This preliminary treatment, the details of which are outside the scope of this Standard, is a matter of agreement between the interested parties and is described in the test report.
2 Normative references
The provisions in the following documents become part of this Standard through reference in this Standard. For dated documents, the subsequent amendments (excluding corrigenda) or revisions do not apply to this Standard. However, all parties who enter into agreement based on this Standard are encouraged to study whether the latest versions of these documents are applicable. For undated documents, the latest versions apply to this Part.
GB/T 8170, Rules of rounding off for numerical values and expression and judgement of limiting values
GB/T 10325, Shaped refractory products ?€? Rule of acceptance, sampling and inspection
3 Definition
For the purpose of this Standard, the following definition apply.
3.1
modulus of rupture
the maximum stress that a prismatic test piece of specified dimensions can withstand when it is bent in a three-point bending device
4 Principle
Loading of test pieces of the product to be tested at a constant rate of increase of stress until failure occurs.
5 Apparatus
5.1 Loading device
5.1.1 The loading device shall have three bearing edges, two to support the test piece and one for the application of the load (see Figure 1). The three edges shall have a radius of curvature in accordance with the requirements given in Table 1 and shall be of length not less than 5 mm greater than the breadth (b) of the test piece (see Figure 2). The contact lines of the three edges shall be parallel to each other in a direction perpendicular to the length and the plane of the breadth of the test piece. Two supporting edges shall rest on an intermediate bearing piece, cylindrical on its lower surface, so that each edge may rotate independently in a vertical plane to accommodate any slight twist in the test piece (see Figure 2). Alternatively, one supporting edge may be fixed, with the other supporting edge and the load-bearing edge being capable of rotation in a vertical plane. The distance between the two supporting edges shall be in accordance with Table 1 and the load-bearing edge shall be positioned equidistantly, at Ls/2 ?? 2 mm from each supporting edge.
5.1.2 The loading device shall be capable of applying a load uniformly across the centre of the test piece. A means shall be provided of recording or indicating the load at failure with an accuracy of ?? 2%. The load at failure measured shall not be less than 10% of or more than 90% of the measuring range.
5.2 Drying oven, capable of being controlled at (110 ?? 5) ??C.
5.3 Vernier caliper, division value not greater than 0.05 mm.
6.3 Preparation of test pieces
6.3.1 Standard size bricks (see 6.2) shall be tested as received.
6.3.2 If test pieces are cut out of bricks, the original brick face of the pressing direction during forming shall be reserved as the pressing face.
NOTE ?€? Cutting with a continuous rim diamond wheel is recommended. If a serrated rim wheel is used, the edges of the cut where the wheel emerges are often frayed; it is therefore recommended that such a wheel should enter the face of the brick that is to form the tensile face of the test piece during the test.
6.3.3 The face of pressing shall be marked on the test piece.
6.3.4 The preparation of test pieces of fired refractory materials shall be carried out as specified with the moulded side face of test pieces as the pressing face. 7 Procedure
7.1 Dry the test piece to constant mass in the oven (5.2), controlled at (110 ?? 5)??C; cool it to room temperature in a desiccator. The test pieces of fired refractory materials shall be placed in a desiccator after drying or heat treatment as required by the interested parties; the time from cooling to the test shall not exceed 3 days. NOTE ?€? The test pieces, for which drying at 110??C ?? 5??C is inappropriate, shall be dried under the conditions determined by agreement between the interested parties.
7.2 Measure the breadth and height of each test piece at its mid-point with an accuracy of ?? 0.1 mm and the distance between the supporting edges with an accuracy of ?? 0.5 mm.
7.3 Place the test piece on the lower bearing edges of the loading device (5.1) so that it rests symmetrically across them. When the test piece is a normal standard brick, the formed face shall be in compression. If the test pieces have been cut out of the brick, the formed face of the original brick shall be in compression.
7.4 Apply the load vertically to the test piece until failure occurs. The rate of increase of stress shall be.
a) for a dense shaped and fired refractory product or material.
0.15 MPa/s ?? 0.015 MPa/s.
b) for an insulating shaped and fired refractory product or material.
d) a reference to this Standard, i.e. ?€?Determined in accordance with GB/T 3001- 2007?€?;
e) the designation of the bricks tested (manufacturer, type, shape, batch number); f) the name, number of items tested and the number of test pieces;
g) the pre-treatment, if any, given to the test pieces (temperature of drying and heat treatment and time of heat preservation and so on);
h) the dimensions of the test pi...

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