1、Designation: C 109/C 109M 071Standard 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
2、the 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.1NOTEA typo in
3、5.9.2 was corrected editorially August 2008.1. Scope*1.1 This 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 t
4、ests).1.2 This test method covers the application of the test usingeither inch-pound or SI units. The values stated in either systemshall be regarded separately as standard. Within the text, the SIunits are shown in brackets. The values stated in each systemare not exact equivalents; therefore, each
5、 system shall be usedindependently of the other. Combining values from the twosystems may result in nonconformance with the specification.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
6、/ASTM SI10, of measurements made in other 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 reg
7、ulatory limitations prior to use. (WarningFreshhydraulic 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 HydraulicCemen
8、tC 150 Specification for Portland CementC 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
9、 of Prisms Broken inFlexure)C511 Specification 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
10、in ConcreteC 670 Practice for Preparing 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 forDet
11、ermining Mass and Volume for Use in the 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 Us
12、e of the InternationalSystem of Units (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
13、 is that sufficient to obtain aflow of 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 edit
14、ion approved Aug. 15, 2007. Published September 2007. Originallyapproved in 1934. Last previous edition approved in 2005 as C 109/C 109M 05.2See 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.o
15、rg, orcontact ASTM Customer Service at serviceastm.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
16、C700, West Conshohocken, PA 19428-2959, 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
17、be used to determine compliance with speci-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
18、conform to therequirements of Specification C 1005. The weighing deviceshall be evaluated for precision and bias at a total load of 2000g.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
19、 permissible varia-tion shall be 62 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 le
20、ast graduations shallextend at least 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
21、separable into not morethan two parts. 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
22、sufficiently rigid toprevent spreading 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
23、.5.5 Flow Table and Flow Mold, conforming 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
24、paraffin at approximately392 F or 200 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
25、 length, with straight edges.5.8 Moist 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 ofverifyin
26、g apparatus. The load applied to the 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
27、dial shallbe readable within 1 % of 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 wi
28、th a graduation lineequal to zero and 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 acc
29、essible from the outside of thedial 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.
30、The numerical increment must be equal 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 displ
31、ayedwithin the verified loading range. 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 i
32、s considered150 in. or 0.5 mmalong the 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
33、 and18 in.or 3.2 mm, one third of the 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
34、 In Use New In UsePlaneness of sides ,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 0719
