ASTM D1734-93(1998)

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
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Designation: D 1734 – 93 (Reapproved 1998)
Standard Practice for
Making Cementitious Panels for Testing Coatings
This standard is issued under the fixed designation D 1734; 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 intended for use on cementitious surfaces. This practice de-
scribes the preparation of such panels.
1.1 This practice covers procedures for molding and curing
cementitious panels for use in exposure testing of coatings
4. Apparatus
designed for masonry or cementitious surfaces, although these
4.1 Molds—High density polyethylene molds to make the
may be suitable for other tests.
panels as required.
1.2 The values stated in SI units are to be regarded as the
4.1.1 Outdoor Exposure Tests, for use on outdoor exposure
standard. The values given in parentheses are for information
testing racks, the panels shall be 8 by 12 by ⁄16 in. (200 by 300
only.
by 15 mm) in size.
1.3 This standard does not purport to address all of the
4.1.2 Machine Exposure Tests, for machine exposure tests,
safety concerns, if any, associated with its use. It is the
the typical panel is 3 by 6 by ⁄16 in. (75 by 150 by 15 mm) in
responsibility of the user of this standard to establish appro-
size.
priate safety and health practices and determine the applica-
4.1.3 Other sizes to fit specific equipment may be used.
bility of regulatory limitations prior to use.
4.2 Trowel, rectangular having a steel blade approximately 4
2. Referenced Documents to 6 in. (100 to 150 mm) in length, with straight edges, and 3
to 5 in. (75 to 125 mm) in width is generally recommended.
2.1 ASTM Standards:
4.3 Weights and Weighing Devices, conforming to the re-
C 109/C 109M Test Method for Compressive Strength of
quirements of Specification C 1005. The weighing device shall
Hydraulic Cement Mortars (Using 2-in. or 50 mm Cube
be evaluated for precision and bias at a total load of 2000 g.
Specimens)
4.4 Mechanical Mixer—An electrically driven mechanical
C 150 Specification for Portland Cement
mixer of the type equipped with a paddle and mixing bowl, as
C 230 Specification for Flow Table for Use in Tests of
specified in Practice C 305.
Hydraulic Cement
4.5 Flow Table, as described in Specification C 230.
C 305 Practice for Mechanical Mixing of Hydraulic Cement
Pastes and Mortars of Plastic Consistency
5. Materials
C 511 Specification for Moist Cabinets, Moist Rooms and
5.1 White Portland Cement, conforming to the requirements
Water Storage Tanks Used in the Testing of Hydraulic
2 of Type I of Specification C 150.
Cements and Concretes
5.2 Graded Standard Sand, conforming to the requirements
C 778 Specification for Standard Sand
of Specification C 778.
C 1005 Specification for Weights and Weighing Devices for
Use in Physical Testing of Hydraulic Cements
6. Procedure
D 4258 Practice for Surface Cleaning Concrete for Coating
3 6.1 Preparation of Material—Mix the cement:sand:water in
D 4259 Practice for Abrading Concrete
a ratio of 1:2:0.43 to obtain a flow of 110 6 5 %, when
D 4260 Practice for Acid Etching Concrete
determined as specified in 10.3 of Test Method C 109. Typi-
cally, for three large test panels, weigh out 1800 g of portland
3. Significance and Use
cement, 3600 g of graded sand and 770 g of water. For three
3.1 Researchers in the field of coatings have recognized the
small test panels, use 350 g of portland cement, 700 g of sand
need for a standardized substrate for evaluating coatings
and 150 g of water.
NOTE 1—Minor adjustments to the flow may be made by the addition
This practice is under the jurisdiction of ASTM Committee D-1 on Paint and
Related Coatings and Materialsand is the direct responsibility of Subcommittee
D01.47 on Masonry Treatments. The sole source of supply of molds known to the committee at this time is the
Current edition approved Sept. 15, 1993. Published November 1
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