YB/T 5200-1993 PDF in English
YB/T 5200-1993 (YB/T5200-1993, YBT 5200-1993, YBT5200-1993)
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| YB/T 5200-1993 | English | 175 |
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Dense refractory castables. Determination of bulk density and apparent porosity
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Standards related to (historical): YB/T 5200-1993
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YB/T 5200-1993: PDF in English (YBT 5200-1993) YB/T 5200-1993
YB
FERROUS METALLURY INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Dense refractory castables - Determination of bulk density
and apparent porosity
ISSUED ON: DECEMBER 08, 1993
IMPLEMENTED ON: JANUARY 01, 1994
Issued by: Ministry of Metallurgical Industry of the People's Republic of China
Table of Contents
1 Subject content and scope of application ... 3
2 Normative references ... 3
3 Definitions ... 3
4 Principle ... 4
5 Equipment ... 4
6 Specimen ... 4
7 Test steps ... 5
8 Result calculation ... 6
9 Test report ... 7
Additional notes ... 9
Dense refractory castables - Determination of bulk density
and apparent porosity
1 Subject content and scope of application
This standard specifies the definition, determination principle, equipment, specimens,
test steps, result calculation, test error of bulk density and apparent porosity of dense
refractory castables.
This standard is applicable to the determination of bulk density and apparent porosity
of dense refractory castables after drying and firing.
2 Normative references
GB 8170 Rules for rounding off of numerical values
GB 7321 Rule of preparing sample for tests of dense shaped refractory products
YB/T 5202 Dense refractory castables - Evaluation of consistency test and
preparation of test-pieces
YB/T 5203 Dense refractory castables - Determination of linear change
3 Definitions
3.1 Total volume Vb: The sum of the volumes of solid materials, open pores, closed
pores in porous materials, which is expressed as the volume enclosed by the outer
surface of the specimen.
3.2 Open pores: Pores in the specimen that can be filled with water or impregnation
liquid.
3.3 Bulk density Db: The ratio of the mass of a porous material to the total volume,
expressed in g/cm3.
3.4 Apparent porosity Pa: The ratio of the volume of all open pores in a porous material
to the total volume, expressed as a percentage.
4 Principle
4.1 Ruler measuring method: Weigh the dry mass of the specimen. Measure the length,
width, height of the rectangular specimen. Calculate the total volume and bulk density.
4.2 Hydrostatic weighing method: Weigh the dry mass of the specimen. Determine the
specimen volume by the hydrostatic weighing method. Calculate the apparent porosity.
It can also be used to determine the bulk density.
5 Equipment
5.1 Electric drying oven
5.2 Pan balance: The maximum load is 5000 g; the sensitivity is 1 g.
5.3 Industrial balance: The maximum load is 1000 g; the sensitivity is 0.05 g.
5.4 Vernier caliper: The graduation value is 0.05 mm.
5.5 Vacuum device: Ensure that the residual pressure is not greater than 2.5 kPa.
5.6 Container with overflow pipe.
5.7 Dryer with desiccant.
5.8 Towel.
6 Specimen
6.1 Number of specimens
Each group of specimens shall be 5 pieces, which is not less than 3 pieces.
6.2 Specimen shape and size
6.2.1 The following rectangular samples can be used for the ruler measuring method:
Type A: 230 mm × 114 mm × 65 mm;
Type B: 230 mm × 65 mm × 54 mm;
Type C: 160 mm × 40 mm × 40 mm.
6.2.2 The specimen for the liquid static weighing method is cut from the type A, type B
or type C specimen, which has a volume of 100 ~ 200 cm3; the ratio of the longest side
to the shortest side shall not exceed 2:1.
6.3 Specimen cutting position
Refer to GB 7321.
6.4 Specimen calcination
It is carried out according to Article 6.3 of YB/T 5203.
6.5 Specimen appearance
The specimen for the ruler measuring method shall have a flat surface and complete
edges and corners. The specimen for the liquid static weighing method shall have no
visible cracks, a flat surface, and no particle falling.
7 Test steps
7.1 Weighing of dried specimens
7.1.1 Before weighing, the fine particles adhering to the surface of the specimen shall
be brushed clean; it is dried in an electric drying oven at 110 ± 5 °C for 2 h or dried to
a constant weight at the temperature specified in the relevant product technical
conditions (see note); moved into a dryer to cool naturally to room temperature.
Note: The sample is dried at 110 ± 5 °C for 1 h, and the difference between the two weighing
before and after is not greater than 0.1% of its mass, which is the constant weight.
7.1.2 Weigh the mass m of the specimen for the ruler method with a pan balance,
accurate to 1 g.
7.1.3 Weigh the mass m1 of the specimen for the hydrostatic weighing method with a
balance, accurate to 0.05 g.
7.2 Specimen size measurement
Measure the length l, width b, height h of the specimen at four points in the middle of
each edge of the specimen, accurate to 0.05 mm. Calculate the total volume Vb of the
specimen by the arithmetic mean of the four measurements.
7.3 Specimen immersion
Put the specimen in a container. Place it in a vacuum device. Evacuate it, until the
residual pressure is less than 2.5 kPa. Keep constant pressure for 15 min. Then slowly
inject the immersion liquid within 5 min according to the following requirements, until
the specimen is completely submerged.
Inject industrial water into hydraulic refractory castables; inject industrial pure organic
liquid into air-hardening refractory castables.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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