ASTM C1506-03

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Designation:C1506–03
Standard Test Method for
Water Retention of Hydraulic Cement-Based Mortars and
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Plasters
This standard is issued under the fixed designation C 1506; 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 4. Significance and Use
1.1 This test method provides for the determination of water 4.1 This test method provides a means for determining the
retention of hydraulic cement-based mortars and plasters. ability of mortars and plasters to retain water under suction.
1.2 This standard does not purport to address all of the Test results may be used to determine compliance with
safety concerns, if any, associated with its use. It is the specifications.
responsibility of the user of this standard to establish appro- 4.2 The results obtained using this test method can be used
priate safety and health practices and determine the applica- to compare the relative ability of mortars and plasters to retain
bility of regulatory limitations prior to use. (Warning—Fresh water under suction.
hydraulic cementitious mixtures are caustic and may cause 4.3 The results obtained using this test method for masonry
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chemical burns to skin and tissue upon prolonged exposure.) mortars do not necessarily indicate the degree of water
retention when used with masonry units, since the amount of
2. Referenced Documents
water absorbed by the unit depends on the rate of absorption of
2.1 ASTM Standards:
the masonry unit.
C 109/C 109M Test Method for Compressive Strength of 4.4 The results obtained using this test method for plasters
Hydraulic Cement Mortars (Using 2-in. or 50-mm Cube
(stucco) do not necessarily indicate the degree of water
3
Specimens) retention when the plaster is applied as a second coat on the
C 185 Test Method for Air Content of Hydraulic Cement
surface of a previously applied plaster base coat, since the
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Mortar amount of water absorbed from the second coat of plaster
C 230 Specification for Flow Table for Use in Tests of
depends on the rate of absorption of the base coat. This is also
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Hydraulic Cement
true when a plaster is applied as a coating on masonry units.
C 305 PracticeforMechanicalMixingofHydraulicCement
3 5. Apparatus
Pastes and Mortars of Plastic Consistency
C 670 Practice Preparing Precision and Bias Statements for 5.1 Tamper, conforming to Test Method C 109/C 109M.
4
Test Methods for Construction Materials 5.2 Straightedge, conforming to Test Method C 185.
3
C 1437 Test Method for Flow of Hydraulic Cement Mortar 5.3 Flow Table, conforming to Specification C 230.
5.4 Mixing Apparatus, conforming to the requirements pre-
3. Summary of Test Method
scribed in Practice C 305.
3.1 The flow of the mortar or plaster is determined. The 5.5 Filtration Assembly, an apparatus essentially as shown
mortar or plaster is then subjected to a controlled vacuum
in Fig. 1 shall be used. This apparatus consists of a perforated
suction for 60 s, after which the flow is again determined. The dish resting on a funnel, which is connected by a three-way
water retention is the final flow divided by the initial flow
stopcock to a vacuum flask, to which a controlled vacuum is
expressed as a percentage. applied. The perforated dish shall be made of metal not
attacked by masonry mortar or plaster (Note 1).The metal base
of the dish shall have a thickness of 2.0 6 0.3 mm and shall
conform to the requirements given in Fig. 1.The stopcock bore
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This test method is under the jurisdiction ofASTM Committee C01 on Cement
shall have a 4.0 6 0.5-mm diameter, and the connecting glass
and is the direct responsibility of Subcommittee C01.22 on Workability.
tubing shall have a minimum inside diameter of 4 mm. The
Current edition approved Jan. 10, 2003. Published February 2003. Originally
approved in 2001. Last previous edition approved in 2001 as C 1506–01.
length of the tubing projecting into the 1-L flask from the
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Section on Safety, Manual of Cement Testing, Annual Book of ASTM
stopcock shall extend at least 25 mm below the center line of
Standards, Vol 04.01.
3
the vacuum connection. The contact surfaces of the funnel and
Annual Book of ASTM Standards, Vol 04.01.
4
Annual Book of ASTM Standards, Vol 04.02. perforated dish shall be plane and may need to be lapped to
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C1506–03
NOTE—The gasket is to be synthetic rubber. The stopcock and the bore of the tubing shall be at least 4-mm. A check valve or water trap, or both, is
suggested for the connect
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