ASTM C241-90(1997)e1

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e1
Designation:C241–90 (Reapproved 1997)
Standard Test Method for
Abrasion Resistance of Stone Subjected to Foot Traffic
This standard is issued under the fixed designation C 241; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
e NOTE—Editorial changes were made in September 1997.
1. Scope D,areclampedinpositionslightlyabovethespecimenholders,
and the 2000-g weight bearing on the specimen is the com-
1.1 This test method covers the determination of the abra-
bined weight of the specimen holder, vertical shaft above with
sion resistance of all types of stones for floors, steps, and
the attached spur gear, and a weight hopper, E, containing
similar uses where the wear is caused by the abrasion of foot
additional adjustment weights. The frame, F, carrying the
traffic.
guide rings is adjustable vertically to accommodate different
1.2 This standard does not purport to address the safety
specimen thicknesses. Gears, C, are adjusted on the shafts for
concerns, if any, associated with its use. It is the responsibility
each specimen thickness, so that they are slightly above the
of the user of this standard to establish appropriate safety and
plate, G, throughout the test.
health practices and determine the applicability of regulatory
limitations prior to use.
6. Sampling
2. Referenced Documents 6.1 The sample may be selected by the purchaser or his
authorized agent but shall represent the average quality of the
2.1 ASTM Standards:
type or grade of stone under consideration. It shall be of
C 97 Test Methods for Absorption and Bulk Specific Grav-
sufficient size to permit the preparation of at least three test
ity of Dimension Stone
specimens, and one face should have the finish to be exposed
C 119 Terminology Relating to Dimension Stone
to traffic. The sample preferably should be 1 in. (25.4 mm)
3. Terminology
thick and 8 in. (203.2 mm) square.
3.1 Definitions—All definitions are in accordance with Ter-
7. Test Specimens
minology C 119.
7.1 At least three specimens 2 in. (50.8 mm) square and
4. Significance and Use
preferably 1 in. (25.4 mm) in thickness shall be sawed from the
sample. The sharp edges shall be rounded by grinding to a
4.1 Thistestmethodisusefulinindicatingthedifferencesin
radius of approximately ⁄32 in. (0.8 mm) in order to prevent
abrasion resistance between the various building stones. This
crumbling during the test.
test method also provides one element in comparing stones of
the same type.
8. Conditioning
5. Apparatus 8.1 Dry the specimens for 48 h in a ventilated oven at a
temperature of 60 6 2°C (140 6 4°F). At the 46th, 47th, and
5.1 The abrasion testing apparatus shown in Fig. 1 shall be
48th hour, weigh the specimens to ensure that the weight is the
used. This apparatus consists essentially of a power-driven
same. If the weight continues to drop, continue to dry the
grinding lap, A, 10 in. (254 mm) in diameter, which is revolved
specimens until there are three successive hourly readings with
at 45 rpm; three specimen holders, B, with superimposed
the same weight.After removing the specimens from the oven,
weights; gears, C, for revolving the specimen; and a means of
cool them to room temperature in a desiccator before testing
feeding abrasive at a constant rate to the lap. The guide rings,
them.
1 9. Procedure
This test method is under the jurisdiction of ASTM Committee C-18 on
Dimension Stone and is the direct responsibility of Subcommittee C18.01 on Test
9.1 Weigh the test specimens to the nearest 0.01 g; then
Methods.
place them in the abrasion testing apparatus and abrade for 225
Current edition approved April 27, 1990. Published June 1990. Originally
revolutions of the grinding lap with No. 60 Alundum abrasive
published as C 241 – 50 T. Last previous edition C 241 – 85e .
Annual Book of ASTM Standards, Vol 04.07.
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C241
A—Grinding lap. E—Weight hopper.
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