ASTM D8271-21

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Designation: D8271 − 19 D8271 − 21
Standard Test Method for
the Direct Measurement of Surface Profile of Prepared
Concrete
This standard is issued under the fixed designation D8271; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This test method is suitable for both field and laboratory use to quantify the depth of surface profile of prepared concrete. It
may also be used on unprepared concrete surfaces.
1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for
information only and are not considered 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, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
D4417 Test Methods for Field Measurement of Surface Profile of Blast Cleaned Steel
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
E178 Practice for Dealing With Outlying Observations
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
3. Summary of Test Method
3.1 The depth of profile is measured using a fine pointed probe at a predetermined number of locations, and the range and
arithmetic mean of the maximum peak-to-valley distances is determined.
4. Significance and Use
4.1 Proper bonding of coatings and linings to concrete surfaces requires proper cleaning and frequently requires the concrete to
be roughened to increase the surface area. The roughness, also known as surface profile, can be imparted into concrete by abrasive
This test method is under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.46 on Industrial Protective Coatings.
Current edition approved Aug. 1, 2019Feb. 1, 2021. Published August 2019February 2021. Originally approved in 2019. Last previous edition approved in 2019 as
D8271 – 19. DOI: 10.1520/D8271-19.10.1520/D8271-21.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
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D8271 − 21
blast cleaning, acid etching or various impact/scarifying power tools. The resulting surface profile depth can influence
coating/lining adhesion and performance. Coating/lining manufacturers and/or facility owners or facility owners, or both,
frequently specify cleaning and roughening of the concrete surface prior to product installation. The procedure described herein
enables the user to quantitatively determine the profile directly from the prepared concrete surface in multiple locations. The
procedure is similar to that described in Method B of ASTM Test Methods D4417, which addresses measurement of surface profile
on abrasive blast cleaned steel surfaces.
5. Apparatus
5.1 A depth micrometer fitted with a remote pointed probe. The probe point is machined at a 60° included angle with a nominal
radius of 500 μm at the tip and exerting a minimum force of 75 g. The base of the probe has a surface area diameter between
2020 mm and 25 mm. This base rests on the tops of the peaks of the surface profile while the spring-loaded tip, protruding from
the probe face projects into the valleys. The distance that the tip projects into the valley relative to the tops of the peaks is displayed.
5.2 The depth micrometer must have a minimum upper range of 6 mm (250 mils) and a manufacturer stated accuracy of 61 %
or greater.
6. Test Surface
6.1 Any concrete/masonry surface that is free of loose surface interference material, dirt, dust, and abrasive residue. The
instrument probe must sit flush on the concrete surface; care should be taken when measuring on curved surfaces.
7. Procedure
7.1 Verify instrument accuracy prior to each period of use by measuring a metal shim of known thickness placed onto plate float
glass (see 7.2). Both are usually supplied by the instrument manufacturer. Certified standards are also available. If the average of
at least three measurements is not within the combined tolerance of the instrument and the shim or certified standards , follow the
instrument manufacturer’s instructions for adjustment or repair.
7.2 Prior to use, verify that the gauge reads zero by placing its probe on a piece of plate float glass (zero plate). Hold the gauge
by its base and press firmly against the glass. If the average of at least three measurements is not within the tolerance of the
instrument, adjust the instrument to zero by following the instrument manufacturer’s instructions.
7.3 Position and hold the probe firmly against the prepared substrate to obtain readings of the roughened concrete. Do not drag
the probe across the surface between readings or the spring-loaded tip may become worn, leading to false readings. Avoid air voids
and other surface irregularities that may generate false readings.
7.4 Measure the profile of the prepared surfaces at a sufficient number of locations to characterize the surface, as specified or
agreed upon between the interested parties. At each location obtain 15 readings within a 15 cm by 15 cm (6 in. by 6 in.) area,
discard any unusually high or low readings that are not representative of the area (outliers, as defined by ASTMPractice E178),
obtain replacement readings for those discarded, and record the average of the 15 readings. Calculate the range and mean for each
location and the range and mean of all the l
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