1、Designation: C1506 09C1506 16Standard Test Method forWater Retention of Hydraulic Cement-Based Mortars andPlasters1This standard is issued under the fixed designation C1506; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year
2、of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This test method provides for the determination of water retention of hydraulic cement-based mortars and plasters.
3、1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish a
4、ppropriate safety and health practices and determine the applicability of regulatorylimitations prior to use. (WarningFresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin andtissue upon prolonged exposure.)22. Referenced Documents2.1 ASTM Standards:3C109/C109M Test
5、Method for Compressive Strength of Hydraulic Cement Mortars (Using 2-in. or 50-mm Cube Specimens)C185 Test Method for Air Content of Hydraulic Cement MortarC230/C230M Specification for Flow Table for Use in Tests of Hydraulic CementC305 Practice for Mechanical Mixing of Hydraulic Cement Pastes and M
6、ortars of Plastic ConsistencyC511 Specification for Mixing Rooms, Moist Cabinets, Moist Rooms, and Water Storage Tanks Used in the Testing of HydraulicCements and ConcretesC670 Practice for Preparing Precision and Bias Statements for Test Methods for Construction MaterialsC1437 Test Method for Flow
7、of Hydraulic Cement Mortar3. Summary of Test Method3.1 The After initial mixing is complete, the flow of the mortar or plaster is determined. The mortar or plaster is then subjectedto a controlled vacuum suction for 60 s, after which the flow is again determined. The water retention is the final flo
8、w divided bythe initial flow expressed as a percentage.4. Significance and Use4.1 This test method provides a means for determining the ability of mortars and plasters to retain water under suction. Testresults may be used to determine compliance with specifications.4.2 The results obtained using th
9、is test method can be used to compare the relative ability of mortars and plasters to retain waterunder suction.4.3 The results obtained using this test method for masonry mortars do not necessarily indicate the degree of water retentionwhen used with masonry units, since the amount of water absorbe
10、d by the unit depends on the rate of absorption of the masonryunit.4.4 The results obtained using this test method for plasters (stucco) do not necessarily indicate the degree of water retentionwhen the plaster is applied as a second coat on the surface of a previously applied plaster base coat, sin
11、ce the amount of waterabsorbed from the second coat of plaster depends on the rate of absorption of the base coat. This is also true when a plaster isapplied as a coating on masonry units.1 This test method is under the jurisdiction of ASTM Committee C01 on Cement and is the direct responsibility of
12、 Subcommittee C01.22 on Workability.Current edition approved Dec. 1, 2009Jan. 1, 2016. Published January 2010February 2016. Originally approved in 2001. Last previous edition approved in 20082009 asC1506C1506 09.08. DOI: 10.1520/C1506-09.10.1520/C1506-16.2 Section on Safety, Manual of Cement Testing
13、, Annual Book of ASTM Standards, Vol 04.01.3 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is n
14、ot an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropria
15、te. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15
16、. Apparatus5.1 Tamper, conforming to Test Method C109/C109M.5.2 Straightedge, conforming to Test Method C185.5.3 Flow Table, conforming to Specification C230/C230M.5.4 Mixing Apparatus, conforming to the requirements prescribed in Practice C305.5.5 Filtration Assembly, an apparatus essentially as sh
17、own in Fig. 1 shall be used. This apparatus consists of a perforated dishresting on a funnel, which is connected by a three-way stopcock to a vacuum flask, to which a controlled vacuum is applied. Theperforated dish shall be made of metal not attacked by masonry mortar or plaster (Note 1). The metal
18、 base of the dish shall havea thickness of 2.0 6 0.3 mm and shall conform to the requirements given in Fig. 1. The stopcock bore shall have a 4.0 6 0.5-mmdiameter, and the connecting glass tubing shall have a minimum inside diameter of 4 mm. The length of the tubing projecting intothe 1-L flask from
19、 the stopcock shall extend at least 25 mm below the center line of the vacuum connection. The contact surfacesof the funnel and perforated dish shall be plane and may need to be lapped to ensure intimate contact. An airtight seal shall bemaintained between the funnel and the dish during the test. Th
20、is shall be accomplished by either of the following procedures. (1)A synthetic (grease-resistant) rubber gasket may be permanently sealed to the top of the funnel using petrolatum or light greaseto ensure a seal between the gasket and dish. (2) The top of the funnel may be lightly coated with petrol
21、eum or light grease toensure a seal between the funnel and dish. Care should be taken to ensure that none of the holes in the perforated dish becomeclogged. Hardened, smooth, not rapid filter paper shall be used. It shall be 150 mm in diameter and be placed so as to completelycover the perforations
22、in the dish.NOTE 1Stainless steel, brass, and bronze are suitable metals for this purpose.5.6 Controlled Vacuum Source:5.6.1 A vacuum gage capable of reading at least 9-kPa pressure in 0.1-kPa increments (Note 2 and Note 3), connected to aminiature vacuum regulator having a maximum 55-kPa capacity,
23、which is then connected to a vacuum pump or water aspiratoras shown in Fig. 1. Connection is made between the vacuum flask and the vacuum gage.NOTE 2Vacuum values are all given as pressure relative to atmospheric pressure.NOTE 3Gages reading pressure in other units are acceptable as long as their ca
24、pacity and scale increments comply with the levels specified here. (Forexample, a vacuum gage with a minimum capacity of 70 mm of Hg in 1-mm increments is acceptable. To convert mm of Hg to kPa, multiply by 0.1333.Thus the 7.0-kPa starting pressure is equivalent to 53-mm Hg.)6. Temperature and Humid
25、ity6.1 The temperature of the mixing room and the room containing the water retention apparatus shall conform to therequirements of Specification C511.7. Materials7.1 The composition of the mortar or plaster to be tested for water retention shall be that described in the specification of thematerial
26、 being considered, or that desired.8. Mixing of Mortar and Plaster8.1 The mortar or plaster to be tested for water retention shall be mixed as specified in the section on Procedure for MixingMortars of Practice C305, or as described in the specification for the material being considered.9. Procedure
27、9.1 Preparation of ApparatusSeat the perforated dish on the greased gasket or greased rim of the funnel. Place a wetted filterpaper in the bottom of the dish. Turn the stopcock to apply the vacuum to the funnel and check the apparatus for leaks. Adjustthe vacuum to 7.0 6 0.4 kPa (Note 2). Turn the s
28、topcock to shut off the vacuum from the funnel. Do not remove the dish fromthe funnel until instructed to do so in 9.5.9.2 Determination of FlowDetermine the flow in accordance with Test Method C1437.9.3 Preparation of Mortar or Plaster BedImmediately after making the flow test, return the mortar or
29、 plaster on the flow tableto the mixing bowl and remix the entire batch for 15 s at medium speed. Immediately after remixing, fill the perforated dish withthe material to slightly above the rim. Tamp 15 times with the tamper. Apply ten of the tamping strokes at approximately uniformspacing adjacent
30、to the rim of the dish, and with the long axis of the tamping face held at right angles to the radius of the dish.Apply the remaining five tamping strokes at random points distributed over the central area of the dish. Use just enough tampingpressure to fill the dish with the top of the material ext
31、ending slightly above the rim. Smooth off the material by drawing the flatside of the straightedge (with the leading edge slightly raised) across the top of the dish. Strike-off the material to a plane surfaceflush with the rim of the dish with the straightedge held in a perpendicular position; usin
32、g a sawing motion, draw the straightedgeacross half of the surface of the dish; repeat the procedure on the other half of the unfinished surface. If the material is pulled awayC1506 162from the side of the dish during the process of drawing the straightedge across the dish, gently press the material
33、 back into contactwith the side of the dish using the tamper. Complete the entire filling and strike-off operation in not more than 2 min.9.4 Application of Vacuum to Mortar or PlasterTurn the stopcock to apply the vacuum to the funnel. After suction for 60 s,quickly turn the stopcock to expose the
34、funnel to atmospheric pressure.9.5 Determination of Flow After SuctionImmediately slide the perforated dish off the funnel, touch the bottom of the dishmomentarily on a damp cloth to remove droplets of water. Set the dish on a work table, plow and mix the mortar or plaster forNOTE 1The gasket is to
35、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 connection to the vacuum source.FIG. 1 Apparatus Assembly for the Water-Retention TestC1506 16315 s, with the rubber scraper prescribed in Practice C305. Det
36、ermine the flow in accordance with Test Method C1437. Removethe vacuum and complete the flow test in less than 2 min.10. Calculation10.1 Calculate the water retention value for the mortar or plaster as follows:Water retention,%5A/B! 3100where:A = flow after suction, andB = flow immediately after ini
37、tial mixing.Report to the nearest 1 %.11. Precision and Bias11.1 PrecisionThe following precision values were calculated from results of tests reported to Cement and ConcreteReference Laboratory (CCRL) for masonry cement proficiency samples Number 3 through 42 (Note 4). Within- andamong-laboratory s
38、tandard deviations were calculated by CCRL for each sample pair. Values were pooled over all 40 samples forpurposes of this analysis. Water retention test results (excluding outliers) ranged from 72 to 88 %. The average number oflaboratories reporting was 69.NOTE 4These tests utilized a slightly dif
39、ferent test pressure, 6.7 6 0.4 kPa (50 6 0.3 mm Hg).11.1.1 Single-laboratory PrecisionThe single-laboratory standard deviation has been found to be 3.5 % (Note 5). Therefore,the results of two properly conducted tests in the same laboratory on the same material should not differ by more than 9.8 %
40、(Note5) in 95 % of such pairwise comparisons.11.1.2 Multilaboratory PrecisionThe multilaboratory standard deviation has been found to be 5.1 % (Note 5). Therefore, theresults of two properly conducted tests in different laboratories on the same material should not differ by more than 14.3 % (Note5)
41、in 95 % of such pairwise comparisons.NOTE 5These numbers represent, respectively, the 1s and d2s limits as described in Practice C670.11.2 BiasSince there is no accepted reference material suitable for determining bias in this test method, no statement on biasis being made.12. Keywords12.1 hydraulic
42、 cement; mortar; plaster; water retentionSUMMARY OF CHANGESCommittee C01C01 has identified the location of selected changes to this test method standard since the lastissue, issue (C1506 08C1506 09,) that may impact the use of this test method. standard. (Approved Jan. 1,2016December 1, 2009).)(1) R
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