1、Designation: C1073 12Standard Test Method forHydraulic Activity of Slag Cement by Reaction with Alkali1This standard is issued under the fixed designation C1073; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revi
2、sion. 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 This test method covers the rapid determination ofhydraulic activity of slag cement. This test method measuresthe accelerated s
3、trength development of the slag cement byusing sodium hydroxide solution as mixing water and curing atelevated temperature.1.2 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of
4、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. A specific warningstatement is given in Section 6.1.4 The text of t
5、his standard references notes and footnoteswhich provide explanatory information. These notes and foot-notes (excluding those in tables) shall not be considered asrequirements of this standard.2. Referenced Documents2.1 ASTM Standards:2C109/C109M Test Method for Compressive Strength ofHydraulic Ceme
6、nt Mortars (Using 2-in. or 50-mm CubeSpecimens)C125 Terminology Relating to Concrete and Concrete Ag-gregatesC219 Terminology Relating to Hydraulic CementC305 Practice for Mechanical Mixing of Hydraulic CementPastes and Mortars of Plastic ConsistencyC670 Practice for Preparing Precision and Bias Sta
7、tementsfor Test Methods for Construction MaterialsC778 Specification for SandC989 Specification for Slag Cement for Use in Concreteand Mortars3. Terminology3.1 Definitions:3.1.1 Definitions are given in Terminology C125 and C219.3.2 Description of Term Specific to This Standard:3.2.1 slag, ngranulat
8、ed blast-furnace slag as defined inTerminology C125 and ground to cement fineness.4. Significance and Use4.1 This test method can be used as a quality-control test forslag production from a single source after adequate correlationwith tests stipulated in Specification C989.4.2 This test method may b
9、e used as an evaluation techniquefor slag cement, when an appropriate correlation with variousfinenesses of slag cements from a specific source ground in aspecific laboratory mill has been previously developed.4.3 The hydraulic activity as measured by this test methodon slag cement samples can provi
10、de guidance to a manufac-turer as to fineness level required to maintain a certain level ofhydraulic activity.4.4 While this test method is intended primarily as a qualitycontrol test, some studies have shown that the test method iscapable of evaluating the hydraulic activity of slag cementsfrom dif
11、ferent sources.5. Apparatus5.1 Three-Gang Molds for 2-in. or 50-mm Cubes andCompression Test Machine, as specified in Test Method C109/C109M (Note 1).NOTE 1Silicone grease is recommended for protection of moldsurfaces from the caustic solution in this test.1This test method is under the jurisdiction
12、 of ASTM Committee C09 onConcrete and Concrete Aggregates and is the direct responsibility of SubcommitteeC09.27 on Ground Slag.Current edition approved July 15, 2012. Published October 2012. Originallyapproved in 1985. Last previous edition approved in 2011 as C107397a(2011).DOI: 10.1520/C1073-12.2
13、For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C
14、700, West Conshohocken, PA 19428-2959, United States.5.2 Mixer, as specified in Method C305.5.3 Curing Chamber, capable of maintaining a temperatureof air or water bath of 55 6 2C.5.4 Containers, capable of holding one three-cube mold inan essentially vapor-tight condition. If polyethylene or otherp
15、lastic bags are used, they shall have a closure of the zip type.If rigid containers are used, they shall have tight sealing covers(Note 2). The acceptability of containers shall be determinedby measuring the water loss after curing in air or the gain aftercuring in water bath. Water loss shall be le
16、ss than 15 mL in aircuring or gain less than 5 mL in water-bath curing.NOTE 2Plastic boxes designed for household storage of celery with abottom grid have given good service.6. Materials6.1 Graded Standard SandThe sand used for making testspecimens shall be natural silica sand conforming to therequi
17、rements for graded standard sand in Specification C778.6.2 Reagent Sodium Hydroxide Solution (20 %):6.2.1 Prepare fresh daily using boiled distilled water andreagent grade sodium hydroxide (NaOH).6.2.2 Dissolve 200 g of sodium hydroxide in 1 L of distilledwater and cool to room temperature. WarningA
18、ll work withthis highly caustic solution should be completed with the use ofgloves, apron, and face mask.NOTE 3One litre will provide enough solution for eight three-cubebatches. More or less solution in these proportions should be madedepending on the number of batches to be mixed during the day.7.
19、 Procedure7.1 BatchThe quantities of materials to be mixed at onetime in the batch of mortar for making three or six specimensshall be as follows:Number of Specimens36Slag Cement, g 250 500Sand, g 687.5 1375NaOH solution, mL 112.5 2257.2 Preparation of SpecimensPrepare specimens in accor-dance with
20、Test Method C109/C109M, except that the mixingwater shall be replaced by the volume of NaOH solution equalto the volume of water which would give a water/slag cementratio of 0.45 by mass.7.3 CuringImmediately upon completion of moldingplace each three-cube mold in a container. Add approximately50 mL
21、 of water into the container at the mold base in order toassure 100 % relative humidity during the curing cycle. In thecase where plastic bags are employed, special care should beexercised to avoid tearing the plastic during handling. Place thecontainer and molds in the curing chamber maintained at
22、55 62C. If water curing is used, rigid containers shall be requiredand the water temperature shall be controlled to the prescribedtemperature and a minimum 5 mL of water shall cover thecontainers. At the end of 23 614 h remove the molds from thecuring chamber and examine each container for leaks. If
23、 morethan 15 mL of water has escaped or more than 5 mL of waterhas entered, discard the specimens and retest. Remove thespecimens from the mold and store in room air until tested.7.4 Determination of Compressive StrengthTest the speci-mens for compressive strength at 24 612 h in accordance withTest
24、Method C109/C109M.8. Calculation8.1 Calculate the compressive strength of the specimens inaccordance with Test Method C109/C109M.9. Faulty Specimens and Retests9.1 Faulty specimens and the need for retest shall bedetermined in accordance with Test Method C109/C109M.10. Report10.1 The average strengt
25、h in MPa rounded to the nearest 0.1MPa at 24 h shall be reported as the hydraulic activity of thesample. For example, HydraulicActivity with NaOH: 7.3 MPa.11. Precision and Bias11.1 PrecisionThe following precision statements weredeveloped using data generated from an interlaboratory testprogram. Ni
26、ne laboratories participated in the program andtested three slags with varied hydraulic activity. Duplicate testswere performed on different days. Revisions to the precisionstatements shall be made as more comprehensive data becomeavailable.11.1.1 The precision statements are applicable when a testr
27、esult is the average of compressive strengths of three cubesmolded from a single batch of mortar and tested at the sameage.11.1.2 The multilaboratory coefficient of variation has beenfound to be 8.1 % (Note 4). Therefore, results of properlyconducted tests of single batches by two different laborato
28、riesshould not differ by more than 22.9 % of their average (Note4).11.1.3 The single-laboratory coefficient of variation hasbeen found to be 4.6 % (Note 4). Therefore, results of twoproperly conducted tests of single batches of mortar made withthe same materials either on the same day or within the
29、sameweek should not differ from each other by more than 13.0 % oftheir average (Note 4).NOTE 4These numbers represent respectively the (Is) and (d2s) limitsas described in Practice C670.11.2 BiasThe procedure in this test method has no biassince the hydraulic activity is defined only in terms of the
30、 testmethod.12. Keywords12.1 ground slag; hydraulic activity; slag cementC1073 122ASTM 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 v
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