1、C109/C109M-13e1NorE 6-Watertight Molds-The mixture of paraffin wax and rosin10.4.2 Hand Tamping-Start molding the specimens withinspecified for sealing the joints between molds and base plates may bea total elapsed time of not more than 2 min and 30 s afterfound difficult to remove when molds are be
2、ing cleaned.Use of straightparaffin wax is permissible if a watertight joint is secured,but due to thecompletion of the original mixing of the mortar batch.Place alow strength of paraffin wax it should be used only when the mold is notlayer of mortar about 1 in.or 25 mm(approximately one halfheld to
3、 the base plate by the paraffin wax alone.When securing clampedof the depth of the mold)in all of the cube compartments.molds with paraffin wax,an improved seal can be obtained by slightlyTamp the mortar in each cube compartment 32 times in aboutwarming the mold and base plate prior to applying the
4、wax.Molds so10 s in 4 rounds,each round to be at right angles to the othertreated should be allowed to return to room temperature before use.and consisting of eight adjoining strokes over the surface of the10.Procedurespecimen,as illustrated in Fig.1.The tamping pressure shall be10.1 Composition of
5、Mortars:just sufficient to ensure uniform filling of the molds.The 410.1.1 The proportions of materials for the standard mortarrounds of tamping(32 strokes)of the mortar shall be com-shall be one part of cement to 2.75 parts of graded standardpleted in one cube before going to the next.When the tamp
6、ingsand by weight.Use a water-cement ratio of 0.485 for allof the first layer in all of the cube compartments is completed,portland cements and 0.460 for all air-entraining portlandfill the compartments with the remaining mortar and then tampcements.The amount of mixing water for other than portland
7、as specified for the first layer.During tamping of the secondand air-entraining portland cements shall be such as to producelayer.bring in the mortar forced out onto the tops of the moldsa flow of 110 5 as determined in accordance with 10.3 andafter each round of tamping by means of the gloved finge
8、rs andshall be expressed as weight percent of cement.the tamper upon completion of each round and before starting10.1.2 The quantities of materials to be mixed at one time inthe next round of tamping.On completion of the tamping,thethe batch of mortar for making six,nine,and twelve testtops of all c
9、ubes should extend slightly above the tops of thespecimens shall be as follows:molds.Bring in the mortar that has been forced out onto thetops of the molds with a trowel and smooth off the cubes byNumber of Specimens6912Cement,g5007401060drawing the flat side of the trowel(with the leading edgeSand,
10、g137520352915slightly raised)once across the top of each cube at right anglesWater,mLto the length of the mold.Then,for the purpose of leveling thePortland(0.485)242359514Air-entraining portland(0.460)230340488mortar and making the mortar that protrudes above the top ofOther(to flow of 110 5)the mol
11、d of more uniform thickness,draw the flat side of the10.2 Preparation of Mortar:trowel(with the leading edge slightly raised)lightly once along10.2.1 Mechanically mix in accordance with the procedurethe length of the mold.Cut off the mortar to a plane surfacegiven in Practice C305flush with the top
12、of the mold by drawing the straight edge of10.3 Determination of Flow:the trowel(held nearly perpendicular to the mold)with a10.3.1 Determine flow in accordance with procedure givensawing motion over the length of the mold.in Test Method C1437.10.4.3 Alternative Methods-Any consolidation methodmay b
13、e used that meets the qualification requirements of this10.3.2 For portland and air-entraining portland cements,merely record the flow.section.The consolidation method consists of a specific10.3.3 In the case of cements other than portland or air-procedure,equipment and consolidation device,as selec
14、ted andentraining portland cements,make trial mortars with varyingused in a consistent manner by a specific laboratory.Thepercentages of water until the specified flow is obtained.Makemortar batch size of the method may be modified to accom-each trial with fresh mortar.modate the apparatus,provided
15、the proportions maintain the10.3.4 Immediately following completion of the flow test,same ratios as given in 10.1.2.return the mortar from the flow table to the mixing bowl.10.4.3.1 Separate qualifications are required for the follow-ing classifications:Quickly scrape the bowl sides and transfer int
16、o the batch theClass A,Non-air entrained cements-for use in concrete,mortar that may have collected on the side of the bowl and thensuch as sold under Specifications C150.C595,and C1157.remix the entire batch 15 s at medium speed.Upon completionof mixing,the mixing paddle shall be shaken to remove e
17、xcessClass B,Air-entrained cements-for use in concrete,suchas sold under Specifications C150,C595,and C1157.mortar into the mixing bowl.10.3.5 When a duplicate batch is to be made immediatelyClass C,Masonry,Mortar and Stucco Cements-such asfor additional specimens,the flow test may be omitted and th
18、esold under Specifications C91,C1328,and C1329.mortar allowed to stand in the mixing bowl 90 s withoutcovering.During the last 15 s of this interval,quickly scrapethe bowl sides and transfer into the batch the mortar that mayhave collected on the side of the bowl.Then remix for 15 s atmedium speed.1
19、0.4 Molding Test Specimens:10.4.1 Complete the consolidation of the mortar in themolds either by hand tamping or by a qualified alternativemethod.Alternative methods include but are not limited to theRounds 1 and 3Rounds 2 and 4use of a vibrating table or mechanical devices.FIG.1 Order of Tamping in
20、 Molding of Test SpecimensASTM4C109/C109M-13e110.4.3.2 An alternative method may only be used to test the(3)Results that differ from the accepted value of a knowncement types as given in 10.4.3.1 above,for which it has beenreference sample with established strength values by more thanqualified.twice
21、 the multi-laboratory Is values of Table 2.10.4.3.3 It can also be used for Strength Activity IndexBefore starting the requalification procedure,evaluate alldeterminations for fly ash and slag,such as sold underaspects of cube fabrication and testing process to determine ifSpecifications C618 and C9
22、89,provided the alternative methodthe offending result is due to some systematic error or just anhas qualified for both Class A and Class C cements.occasional random event.10.4.4 Qualification Procedure-Contact CCRL to purchase10.4.5.2 If the compaction equipment is replaced,signifi-cement samples t
23、hat have been used in the Proficiency Samplecantly modified,repaired,or has been recalibrated,requalifyProgram(PSP).Four samples(5 Kg each)of the class to bethe equipment in accordance with 10.4.4.qualified will be required to complete a single qualificationNorE 7-It is recommended that a large homo
24、genous sample of cement(See Note 7).be prepared at the time of qualification for use as a secondary standard and10.4.4.1 In one day,prepare replicate 6-cube or 9-cubefor method evaluation.Frequent testing of this sample will give earlybatches using one of the cements and cast a minimum of 36warning
25、of any changes in the performance of the apparatus.cubes.Complete one round of tests on each cement on different10.5 Storage of Test Specimens-Immediately upondays.Store and test all specimens as prescribed in the sectionscompletion of molding,place the test specimens in the moistbelow.Test all cube
26、s at the age of 7-days.closet or moist room.Keep all test specimens,immediately10.4.4.2 Tabulate the compressive strength data and com-after molding.in the molds on the base plates in the moistplete the mathematical analyses as instructed in Annex Al.closet or moist room from 20 to 72 h with their u
27、pper surfaces10.4.5 Requalification of the Alternate Compaction Method:exposed to the moist air but protected from dripping water.If10.4.5.1 Requalification of the method shall be required ifthe specimens are removed from the molds before 24 h,keepany of the following occur:them on the shelves of th
28、e moist closet or moist room until they(1)Evidence that the method may not be providing data inare 24-h old,and then immerse the specimens,except those foraccordance with the requirements of Table 2.the 24-h test,in saturated lime water in storage tanks con-(2)Results that differ from the reported f
29、inal average of astructed of noncorroding materials.Keep the storage waterCCRL-PSP sample with a rating of 3 or less.clean by changing as required.TABLE 2 PrecisionCoefficientAcceptableTest Age,ofRange ofTestdaysvoResults,d2s%4Portland CementsConstant water-cement ratio:Single laboratory13.18.733.91
30、0.93.910.9283.810.6Average3.710.4Multiple laboratories17.320.46.819.06.618.5286.518.2Average6.618.5Blended CementsConstant flow mortar:Single laboratory4.011.33.810.7283.49.6Average3.810.7Multiple laboratories7.822.177.621.5287.420.9Average7.621.5Masonry CementsConstant flow mortar:Single laboratory77.922.3287.521.2Average7.721.8Multiple laboratories711.833.42812.033.9Average11.933.7These numbers represent,respectively,the(1s%)and(d2s%)limits as described in Practice C670.ght ASTM Internationsl
