ASTM D6532-00(2014)

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Designation: D6532 − 00 (Reapproved 2006) D6532 − 00 (Reapproved 2014)
Standard Test Method for
Evaluation of the Effect of Clear Water Repellent Treatments
on Water Absorption of Hydraulic Cement Mortar
Specimens
This standard is issued under the fixed designation D6532; 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 evaluates the effectiveness of clear water repellents on hydraulic cement mortar specimens based on water
absorption after a water soak.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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.
2. Referenced Documents
2.1 ASTM Standards:
C109/C109M Test Method for Compressive Strength of Hydraulic Cement Mortars (Using 2-in. or [50-mm] Cube Specimens)
D1475 Test Method For Density of Liquid Coatings, Inks, and Related Products
D3924 Specification for Environment for Conditioning and Testing Paint, Varnish, Lacquer, and Related Materials
E145 Specification for Gravity-Convection and Forced-Ventilation Ovens
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 clear water repellent, n—a coating formulated for the purpose of protecting porous substrates by reducing the penetration
of liquid water.
4. Summary of Test Method
4.1 The masonry unit is immersed in a clear water repellent, removed and allowed to cure at ambient condition for 7 days. Any
deviations should be noted in 10.1.2. After cure, the masonry unit is weighed and placed in water to a depth of 6.3 mm ( ⁄4 in.)
for 3 days. After the immersion period, the masonry unit is removed and reweighed. The water repellency value of the treatment
is then calculated using a comparison to untreated control specimens.
5. Significance and Use
5.1 Siliceous alkaline substrates are subject to water damage that may result in deterioration. Water repellents can provide
protection of siliceous alkaline substrates exposed to water. This test method is used to evaluate the efficacy of clear water
repellents on alkaline substrates.
6. Apparatus
6.1 Forced Draft Oven, Type 1B, in accordance with the Type Section of Specification E145.
6.2 Balance, having a capacity of not less than 400 g, and sensitivity of 0.01 g.
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 D01.47 on Concrete, Stone and Masonry Treatments.
Current edition approved June 1, 2006Dec. 1, 2014. Published June 2006December 2014. Originally approved in 2000. Last previous edition approved in 20002006 as
D6532 – 00.D6532 – 00 (2006). DOI: 10.1520/D6532-00R06.10.1520/D6532-00R14.
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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D6532 − 00 (2014)
6.3 Reservoir Water Pan, capable of maintaining the water level at 6.3 mm ( ⁄4 in.) in depth with noncorroding rods for the
specimens to sit off the bottom.
6.4 Stiff Bristle Brush, to brush the masonry units.
6.5 Pressurized Air Source, to blow residual material off the brushed masonry units.
6.6 Stopwatch.
7. Reagents and Materials
7.1 Masonry Units, 51 by 51 by 51 mm (2 by 2 by 2 in.) masonry units prepared in accordance with procedures outlined in Test
Method C109/C109M with the form release oil removed can be used.
8. Procedure
8.1 Select substrates needed, brush, and blow off dust with pressurized air. The specimens must be free of loose material that
may be lost and alter the weight. They also must be free of material that will alter the absorption characteristics.
8.2 Label each piece. Run triplicate samples for each water repellent treatment. Also include three untreated control samples
for each series. All specimens in one series of testing should come from the same lot of masonry units.
NOTE 1—To make comparison between test series, a positive control needs to be included. For example, when using mortar cubes, 40 %
isobutyltrimethoxysilane in solvent can be used as a positive control in each series.
2 2
8.3 For the specimen to be treated, measure the surface area of each test specimen to the nearest 5 mm (0.1-in. ) and weigh
to the nearest 0.1 g. Record the weight and area of the uncoated test specimens.
8.4 Dry the required number of specimens in a forced draft oven, as specified in Specification E145, at a temperature of 80 6
5°C until a constant weight has been reached. A constant oven weight shall be assumed when the specimen weighed to the nearest
0.1 g loses not more than 0.1 % in any 4-h period.
8.5 Allow specim
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