ASTM C944-99

Standard Test Method for Abrasion Resistance of Concrete or Mortar Surfaces by the Rotating-Cutter Method

SCOPE
1.1 This test method covers a procedure for determining the resistance of either concrete or mortar to abrasion. It is not intended to be used as an alternative to Test Method C418, or Test Method C779.
1.2 The values stated in SI units are to be regarded as standard.  
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 09-Jul-1999
• ICS: 91.100.10 - Cement. Gypsum. Lime. Mortar
• ICS: 91.100.30 - Concrete and concrete products
• Technical Committee: C09 - Concrete and Concrete Aggregates
• Drafting Committee: C09.62 - Abrasion Testing

Relations

• Replaced By: ASTM C944-99(2005) - Standard Test Method for Abrasion Resistance of Concrete or Mortar Surfaces by the Rotating-Cutter Method
• Effective Date: 10-Jul-1999

Standards Content (Sample)

Designation: C 944 – 99
Standard Test Method for
Abrasion Resistance of Concrete or Mortar Surfaces by the
Rotating-Cutter Method
This standard is issued under the fixed designation C 944; 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.
1. Scope 152-mm [6-in.] diameter concrete cores, mortar specimens, or
other samples of concrete of insufficient test area to permit the
1.1 This test method covers a procedure for determining the
conduct of tests by Test Method C 418 or C 779, this test
resistance of either concrete or mortar to abrasion. This test
method is also applicable on concrete surfaces in place by
method is similar to Procedure B of Test Method C 779.
measuring the abrasion loss as described in Section 9, Proce-
1.2 The values stated in SI units or inch–pound units are to
dure B, of Test Method C 779.
be regarded separately as standard. The values stated in each
system may not be exact equivalents; therefore, each system
4. Apparatus
shall be used independently of the other. Combining values
4.1 Abrasion Device—Adrill press or similar device with a
from the two systems may result in non–conformance with the
chuck capable of holding and rotating the abrading cutter at a
standard.
speed of 200 r/min and exerting a force of either a normal load
1.3 This standard does not purport to address all of the
of 98 6 1 N [22 6 0.2 lbf] or a double load of 197 6 2 N [44
safety concerns, if any, associated with its use. It is the
6 0.4 lbf] on the test specimen surface. Fig. 1 shows a
responsibility of the user of this standard to establish appro-
commercial drill press and Fig. 2 illustrates details of the
priate safety and health practices and determine the applica-
rotating cutter. The difficulty in maintaining a constant load on
bility of regulatory limitations prior to use.
the abrading cutter when using the lever, gear, and spring
2. Referenced Documents system of a drill press has been eliminated by placing the
desired load directly upon the spindle that turns the cutter. The
2.1 ASTM Standards:
machine consists essentially of a frame that supports the drive
C42 Test Method for Obtaining and Testing Drilled Cores
motor, stepped pulley, and spindle. A clamping device to hold
and Sawed Beams of Concrete
the specimen is built into the base.
C 418 Test Method for Abrasion Resistance of Concrete by
2 4.2 Rotating Cutter—Arotating cutter similar to that shown
Sandblasting
in Fig. 2 and Fig. 3 shall be used in which 22 37.5 mm [1.5 in.]
C 779 Test Method for Abrasion Resistance of Horizontal
2 diameter dressing wheels and 24 25.4 to 31.75 mm [1 to 1.25
Concrete Surfaces
in.] diameter washers are mounted. The washers as received
C 1138 Test Method for Abrasion Resistance of Concrete
2 shall be stacked and locked on a bolt for the purpose of
(Underwater Method)
reducing their diameter to the specified range to avoid restrict-
3. Significance and Use ing abrasion of the concrete by the washers. Cutter assembly,
including washers, shall be locked onto horizontal rods such
3.1 This test method gives an indication of the relative wear
that individual dressing wheels are free to turn independently.
resistance of mortar and concrete based on testing of cored or
The overall diameter of the cutter or the diameter of the
fabricated specimens. This test method has been successfully
circular area abraded is 82.5 mm [3 ⁄4 in.]. Care shall be taken
used in the quality control of highway and bridge concrete
to achieve constant contact between the rotating cutter and the
subject to traffic. Primarily intended for use on the top ends of
entire test surface of the sample. This can be better accom-
plished if the cutters have a swivel connection allowing some
This test method is under the jurisdiction of ASTM Committee C09 on
vertical movement. If the dressing wheels have one rounded
Concrete and ConcreteAggregates and is the direct responsibility of Subcommittee
edge, they shall be mounted with the rounded edge toward the
C09.62 on Abrasion Testing of Concrete.
vertical shaft. The individual grinding wheel dressers on the
Current edition approved July 10, 1999. Published September 1999. Originally
published as C 944 – 80. Last previous edition C 944 – 90a. horizontal shaft of the cutter shall be repositioned whenever a
Annual Book of ASTM Standards, Vol 04.02.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
C944–99
FIG. 1 Rotating-Cutter Drill Press
change in the diameter of the outer cutters becomes apparent. 5. Sampling
This is accomplished by reversing each set of dressing wheels
5.1 Cores shall be taken in accordance with Test Method
to bring the smaller diameter cutters toward the vertical shaft.
C42.
4.2.1 In making a test, the rotating cutter is held in a raised
6. Specimens
position by means of the rod provided, the specimen clamped
securely in position, a
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