1、Designation: C 109/C 109M 08Standard Test Method forCompressive Strength of Hydraulic Cement Mortars (Using2-in. or 50-mm Cube Specimens)1This standard is issued under the fixed designation C 109/C 109M; the number immediately following the designation indicates the yearof original adoption or, in t
2、he 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.This standard has been approved for use by agencies of the Department of Defense.1. Scope*1.1 Thi
3、s test method covers determination of the compres-sive strength of hydraulic cement mortars, using 2-in. or50-mm cube specimens.NOTE 1Test Method C 349 provides an alternative procedure for thisdetermination (not to be used for acceptance tests).1.2 This test method covers the application of the tes
4、t usingeither inch-pound or SI units. The values stated in either SIunits or inch-pound units are to be regarded separately asstandard. Within the text, the SI units are shown in brackets.The values stated in each system may not be exact equivalents;therefore, each system shall be used independently
5、 of the other.Combining values from the two systems may result in noncon-formance with the standard.1.3 Values in SI units shall be obtained by measurement inSI units or by appropriate conversion, using the Rules forConversion and Rounding given in Standard IEEE/ASTM SI10, of measurements made in ot
6、her units.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. (War
7、ningFreshhydraulic cementitious mixtures are caustic and may causechemical burns to skin and tissue upon prolonged exposure.2)2. Referenced Documents2.1 ASTM Standards:3C91 Specification for Masonry CementC114 Test Methods for Chemical Analysis of HydraulicCementC 150 Specification for Portland Ceme
8、ntC 230/C 230M Specification for Flow Table for Use in Testsof Hydraulic CementC 305 Practice for Mechanical Mixing of Hydraulic CementPastes and Mortars of Plastic ConsistencyC 349 Test Method for Compressive Strength of Hydraulic-Cement Mortars (Using Portions of Prisms Broken inFlexure)C511 Speci
9、fication for Mixing Rooms, Moist Cabinets,Moist Rooms, and Water Storage Tanks Used in theTesting of Hydraulic Cements and ConcretesC 595 Specification for Blended Hydraulic CementsC 618 Specification for Coal Fly Ash and Raw or CalcinedNatural Pozzolan for Use in ConcreteC 670 Practice for Preparin
10、g Precision and Bias Statementsfor Test Methods for Construction MaterialsC 778 Specification for Standard SandC 989 Specification for Ground Granulated Blast-FurnaceSlag for Use in Concrete and MortarsC 1005 Specification for Reference Masses and Devices forDetermining Mass and Volume for Use in th
11、e PhysicalTesting of Hydraulic CementsC 1157 Performance Specification for Hydraulic CementC 1328 Specification for Plastic (Stucco) CementC 1329 Specification for Mortar CementC 1437 Test Method for Flow of Hydraulic Cement MortarIEEE/ASTM SI 10 Standard for Use of the InternationalSystem of Units
12、(SI): The Modern Metric System3. Summary of Test Method3.1 The mortar used consists of 1 part cement and 2.75 partsof sand proportioned by mass. Portland or air-entrainingportland cements are mixed at specified water/cement ratios.Water content for other cements is that sufficient to obtain aflow of
13、 110 6 5 in 25 drops of the flow table. Two-inch or50-mm test cubes are compacted by tamping in two layers.1This test method is under the jurisdiction of ASTM Committee C01 on Cementand is the direct responsibility of Subcommittee C01.27 on Strength.Current edition approved Dec. 1, 2008. Published J
14、anuary 2009. Originallyapproved in 1934. Last previous edition approved in 2007 as C 109/C 109M 071.2See the section on Safety, Manual of Cement Testing, Annual Book of ASTMStandards, Vol 04.01.3For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at s
15、erviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,
16、United States.The cubes are cured one day in the molds and stripped andimmersed in lime water until tested.4. Significance and Use4.1 This test method provides a means of determining thecompressive strength of hydraulic cement and other mortarsand results may be used to determine compliance with spe
17、ci-fications. Further, this test method is referenced by numerousother specifications and test methods. Caution must be exer-cised in using the results of this test method to predict thestrength of concretes.5. Apparatus5.1 Weights and Weighing Devices, shall conform to therequirements of Specificat
18、ion C 1005. The weighing deviceshall be evaluated for precision and accuracy at a total load of2000 g.5.2 Glass Graduates, of suitable capacities (preferably largeenough to measure the mixing water in a single operation) todeliver the indicated volume at 20 C. The permissible varia-tion shall be 62
19、mL. These graduates shall be subdivided to atleast 5 mL, except that the graduation lines may be omitted forthe lowest 10 mL for a 250-mL graduate and for the lowest 25mL of a 500-mL graduate. The main graduation lines shall becircles and shall be numbered. The least graduations shallextend at least
20、 one seventh of the way around, and intermediategraduations shall extend at least one fifth of the way around.5.3 Specimen Molds, for the 2-in. or 50-mm cube speci-mens shall be tight fitting. The molds shall have not more thanthree cube compartments and shall be separable into not morethan two part
21、s. The parts of the molds when assembled shall bepositively held together. The molds shall be made of hard metalnot attacked by the cement mortar. For new molds theRockwell hardness number of the metal shall be not less than55 HRB. The sides of the molds shall be sufficiently rigid toprevent spreadi
22、ng or warping. The interior faces of the moldsshall be plane surfaces and shall conform to the tolerances ofTable 1.5.4 Mixer, Bowl and Paddle, an electrically driven mechani-cal mixer of the type equipped with paddle and mixing bowl,as specified in Practice C 305.5.5 Flow Table and Flow Mold, confo
23、rming to the require-ments of Specification C 230/C 230M.5.6 Tamper, a nonabsorptive, nonabrasive, nonbrittle mate-rial such as a rubber compound having a Shore A durometerhardness of 80 6 10 or seasoned oak wood rendered nonab-sorptive by immersion for 15 min in paraffin at approximately392 F or 20
24、0 C, shall have a cross section of about12 by1 in. or 13 by 25 mm and a convenient length of about 5 to6 in. or 120 to 150 mm. The tamping face shall be flat and atright angles to the length of the tamper.5.7 Trowel, having a steel blade 4 to 6 in. 100 to 150 mmin length, with straight edges.5.8 Moi
25、st Cabinet or Room, conforming to the require-ments of Specification C511.5.9 Testing Machine, either the hydraulic or the screw type,with sufficient opening between the upper bearing surface andthe lower bearing surface of the machine to permit the use ofverifying apparatus. The load applied to the
26、 test specimen shallbe indicated with an accuracy of 61.0 %. If the load applied bythe compression machine is registered on a dial, the dial shallbe provided with a graduated scale that can be read to at leastthe nearest 0.1 % of the full scale load (Note 2). The dial shallbe readable within 1 % of
27、the indicated load at any given loadlevel within the loading range. In no case shall the loadingrange of a dial be considered to include loads below the valuethat is 100 times the smallest change of load that can be readon the scale. The scale shall be provided with a graduation lineequal to zero an
28、d so numbered. The dial pointer shall be ofsufficient length to reach the graduation marks; the width of theend of the pointer shall not exceed the clear distance betweenthe smallest graduations. Each dial shall be equipped with azero adjustment that is easily accessible from the outside of thedial
29、case, and with a suitable device that at all times until reset,will indicate to within 1 % accuracy the maximum load appliedto the specimen.5.9.1 If the testing machine load is indicated in digital form,the numerical display must be large enough to be easily read.The numerical increment must be equa
30、l to or less than 0.10 %of the full scale load of a given loading range. In no case shallthe verified loading range include loads less than the minimumnumerical increment multiplied by 100. The accuracy of theindicated load must be within 1.0 % for any value displayedwithin the verified loading rang
31、e. Provision must be made foradjusting to indicate true zero at zero load. There shall beprovided a maximum load indicator that at all times until resetwill indicate within 1 % system accuracy the maximum loadapplied to the specimen.NOTE 2As close as can be read is considered150 in. or 0.5 mmalong t
32、he arc described by the end of the pointer. Also, one half of thescale interval is about as close as can reasonably be read when the spacingon the load indicating mechanism is between125 in. or 1 mm and116 in.or 1.6 mm. When the spacing is between116 in. or 1.6 mm and18 in.or 3.2 mm, one third of th
33、e scale interval can be read with reasonablecertainty. When the spacing is18 in. or 3.2 mm or more, one fourth ofthe scale interval can be read with reasonable certainty.TABLE 1 Permissible Variations of Specimen Molds2-in. Cube Molds 50-mm Cube MoldsParameter New In Use New In UsePlaneness of sides
34、 ,1,1)9 or equiva-lent, or use statistical tables to find the confidence in aone-tailed, paired-value t-test on the set of round errors.NOTEThe qualification method fails for bias if (1) the MREr exceedsthe MAREr, % limit; or if (2) the GRE, % exceeds the MGREg limit andthe CL, % exceeds 95 %.C 109/C 109M 089
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