1、Designation: C308 18Standard Practice forWorking, Initial Setting, and Service Strength Setting Timesof Chemical-Resistant Resin Mortars1This standard is issued under the fixed designation C308; the number immediately following the designation indicates the year oforiginal adoption or, in the case o
2、f revision, the year 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. Scope1.1 These methods are used to estimate the working, initialsetting, and service strength setting t
3、imes of chemical-resistantresin mortars.1.2 The values stated in SI units are to be regarded asstandard. The values given in parentheses are mathematicalconversions to inch-pound units that are provided for informa-tion only and are not considered standard.1.3 This standard does not purport to addre
4、ss all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety, health, and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was develo
5、ped in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Docum
6、ents2.1 ASTM Standards:2C279 Specification for Chemical-Resistant Masonry UnitsC307 Test Method for Tensile Strength of Chemical-Resistant Mortar, Grouts, and Monolithic SurfacingsC904 Terminology Relating to Chemical-Resistant Nonme-tallic Materials3. Terminology3.1 DefinitionsFor definitions of te
7、rms used in these testmethods, see Terminology C904.4. Significance and Use4.1 These methods offer a means of estimating the workingtime, initial setting time and service strength setting time ofchemical-resistant resin mortars. The results obtained shouldserve as a guide in, but not as the sole bas
8、is for, selection of achemical-resistant mortar for a particular application.5. Apparatus5.1 Weighing EquipmentShall be capable of weighingmaterials or specimens to 60.3 % accuracy.5.2 Mixing Equipment:5.2.1 Porcelain Enameled PanMeasuring approximately250 mm long by 400 mm wide by 50 mm deep (10 in
9、. by 16in. by 2 in.).5.2.2 Bricklayers Triangular TrowelApproximately 100mm (4 in.) in length.5.3 BricksAs per Specification C279, Type III.5.4 Vicat ApparatusThe Vicat apparatus shall consist of aframe, A (see Fig. 1), bearing a movable rod, B, weighing 300g, one end, C, the plunger end, being 10 m
10、m in diameter for adistance of at least 50 mm and the other end having aremovable steel needle, D, for initial setting timedetermination, 1 mm in diameter and 50 mm in length. The rod,B, is reversible, and can be held in any desired position by a setscrew, E, and has an adjustable indicator, F, whic
11、h moves overa scale (graduated in millimetres) attached to the frame, A. Inaddition to the above, the Vicat apparatus shall conform to thefollowing requirements:5.4.1 Weight of Plunger300 6 0.5 g.5.4.2 Diameter of Larger End of Plunger10 6 0.05 mm.5.4.3 Diameter of Needle1 6 0.05 mm.5.4.4 Graduated
12、ScaleThe graduated scale, when com-pared with a standard scale accurate to within 0.1 mm at allpoints, shall not show a deviation at any point greater than 0.25mm.6. Procedure6.1 Temperature:6.1.1 All materials used in this method shall be stored for atleast 16 h prior to use at the standard test te
13、mperature of 23 62C (73 6 4F). The standard temperature for the working and1This practice is under the jurisdiction of Committee D01 on Paint and RelatedCoatings, Materials, and Applications and is the direct responsibility of D01.46 onIndustrial Protective Coatings.Current edition approved Sept. 1,
14、 2018. Published September 2018. Originallyapproved in 1953. Last previous edition approved in 2012 as C308 00 (2012)1.DOI: 10.1520/C0308-18.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volu
15、me information, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on stand
16、ardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1initial setting time tests shall be 23 6 2C (73 6 4F). Othertest temperatures are accepta
17、ble upon agreement between themanufacturer and user provided that they are reported with thetest data.6.2 Preparation of Mortar:6.2.1 Prepare a 1000-g sample of mortar, using proportion-ate amounts of filler and liquid as recommended by themanufacturer. If the proportions specified are by volume,wei
18、gh the materials and report the corresponding proportionsby weight. Pour an appropriate amount of liquid into the pan,gradually add the powder to the liquid resin, and mix thor-oughly with the trowel until a uniform mixture is obtained (thisshall be complete within 3 min). Continue the mixing operat
19、ionfor 1 min after an apparently uniform mixture is obtained.Spread out the mortar in a layer of uniform thickness coveringthe entire surface of the mixing pan.6.2.2 For a multicomponent resin mortar, the proceduredescribed in 6.2.1 may be modified slightly to permit theaddition of the catalyst to t
20、he mortar within the specified timelimit.6.3 Working Time:6.3.1 Remove approximately 25-g portions of the resinmortar at specific intervals and trowel on the horizontal surfaceof clean, dry freezer paper. In order that sufficient data will beobtained with the minimum quantity of material, it is reco
21、m-mended that the testing be done every 5 min until the materialbegins to curl behind the trowel. The sample shall be removedfrom a portion of the mortar located at least 50 mm (2 in.) fromthe side of the pan. The material used for tests shall not bereturned to the mixing pan. The working time shall
22、 be recordedas the longest time (in minutes) at which the mortar does notcurl behind the trowel.6.4 Initial Setting Time:6.4.1 Immediately after mixing is complete, remove andbutter a sufficient amount of the mortar on the sides of twoclean, dry bricks to providea6mm(14 in.) joint. The bricksshould
23、be laid on freezer paper and the buttered sides pushedtogether to form a joint approximately 6 mm (14 in.) wide. Careshould be taken to eliminate voids when pushing the brickstogether. It is advantageous to establish the joint thickness byinserting a dowel rod near each end of the joint. Strike off
24、anyexcess material above the joint by use of the trowel.6.4.2 Examine the joint qualitatively, at 1-h intervals, withthe point of the trowel until indentation becomes difficult.Continue the test with the Vicat needle (at 20 to 30-minintervals) until the indentation of the needle during a 10-minperio
25、d is less than 1 mm. Record the initial setting time as thetime interval in hours at which the indentation of the Vicatneedle is less than 1 mm.6.5 Service Strength Setting Time:6.5.1 Make a minimum of three tension test specimens fortesting at each time interval. This normally requires 12 or moresp
26、ecimens. Prepare tension specimens in accordance with TestMethod C307. Make the first test 24 h after the initial mixingtime and continue every 48 h until 90 % of the manufacturerspublished value for tensile strength is reached.6.5.2 Record the service strength setting time as the time indays betwee
27、n initial mixing of the component parts at aNOTE 1Ring, G, and plate, H, are not required for this test.FIG. 1 Vicat ApparatusC308 182specified temperature and the time at which the mortar hasacquired at least 90 % of the manufacturers published valuefor tensile strength.7. Report7.1 The report shal
28、l include the following:7.1.1 Identification of mortar tested,7.1.2 Estimate of working time,7.1.3 Estimate of initial setting time,7.1.4 Estimate of service strength setting time,7.1.5 Number of specimens tested, and7.1.6 Any variation from the standard procedure.8. Keywords8.1 chemical-resistant m
29、ortars; service strength setting time;initial setting time; working timeASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of
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