ASTM C511-2006 Standard Specification for Mixing Rooms Moist Cabinets Moist Rooms and Water Storage Tanks Used in the Testing of Hydraulic Cements and Concretes《水硬水泥和混凝土试验用搅拌室、湿气箱、.pdf

1、Designation: C 511 06Standard Specification forMixing Rooms, Moist Cabinets, Moist Rooms, and WaterStorage Tanks Used in the Testing of Hydraulic Cementsand Concretes1This standard is issued under the fixed designation C 511; the number immediately following the designation indicates the year oforig

2、inal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification includes requirements for mixingrooms wher

3、e paste and mortar specimens are prepared; and formoist cabinets, moist rooms, and water storage tanks wherepaste, mortar, and concrete specimens are stored.1.2 Values in SI units shall be obtained by measurement inSI units or by appropriate conversion, using the Rules forConversion and rounding giv

4、en in Standard IEEE/ASTM SI10, of measurements made in other units.1.3 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 ap

5、plica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C51 Terminology Relating to Lime and Limestone (as usedby the Industry)E77 Test Method for Inspection and Verification of Ther-mometersIEEE/ASTM SI 10 Standard for Use of the InternationalSystem of Units (

6、SI): The Modern Metric System3. Terminology3.1 Definitions:3.1.1 mixing room, na room with controlled temperatureand relative humidity where cement paste and mortar speci-mens are prepared.3.1.2 moist cabinet, na compartmented storage facility ofmoderate dimensions with controlled temperature and re

7、lativehumidity.3.1.3 moist room, na “walk-in” storage facility withcontrolled temperature and relative humidity, commonly calleda fog room when the prescribed relative humidity is achievedby the atomization of water.4. Requirements for Cement Mixing Rooms4.1 The temperature of the air in the vicinit

8、y of the mixingslab, molds, and base plates shall be maintained at 23.0 6 4.0C and at a relative humidity of not less than 50 %.4.2 The temperature of the mixing water used to preparecement paste and mortar specimens shall be 23.0 6 2.0 C.5. Temperature Measuring Devices5.1 Reference Temperature Mea

9、suring Deviceused toverify the temperature recorder, must be accurate and readableto 0.5 C. A copy of the certificate or report which verifies theaccuracy shall be available in the laboratory.NOTE 1The ice-point method described in Test Method E77may beused to ensure that no damage to the reference

10、thermometer has occurredduring shipping.5.2 Temperature Recordershall record temperatures every15 min or less and shall be accurate and readable to 1 C. Thedata from the recorder shall be evaluated at a minimum of onceeach week. A record of this evaluation documenting the datechecked, a confirmation

11、 that the data is within the requiredtemperature range, and the name of the individual performingthis evaluation shall be maintained in the laboratory. (Note 2)NOTE 2This requirement may be satisfied by an initialed and datedtemperature recorder chart. Brief changes in the temperature due to doorope

12、nings should be ignored.5.2.1 The temperature recorder shall be verified at leastevery six months or whenever there is a question of accuracy.5.2.1.1 For moist cabinets and rooms, position the referencetemperature measuring device in a readable position in air asnear as practical to the temperature

13、recorder probe. Keep thedoor closed for at least 5 min prior to taking readings. Recordthe temperature readings of both the temperature recorder andthe reference temperature measuring device. When takingthese readings, the reference temperature measuring device1This specification is under the jurisd

14、iction of ASTM Committee C01 onCement and is the direct responsibility of Subcommittee C01.95 on Coordination ofStandards.Current edition approved Nov. 1, 2006. Published November 2006. Originallyapproved in 1968. Last previous edition approved in 2005 as C 511 05.2For referenced ASTM standards, vis

15、it 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.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International,

16、 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.shall remain in the moist cabinet or room and read immediatelyupon opening the door.5.2.1.2 For water storage tanks, position the referencetemperature measuring device in a readable position in water asnear as pract

17、ical to the temperature recorder probe. Withoutremoving the reference temperature measuring device from thewater, record the temperature readings of both the temperaturerecorder and the reference temperature measuring device afterthe temperatures have stabilized.5.2.1.3 Verify the accuracy of the te

18、mperature recorder bycomparing the reading of the temperature recorder with that ofthe reference temperature measuring device during the normaloperation of the moist cabinet, moist room or water storagetanks. If the difference between the temperature readings isgreater than 1 C, the temperature reco

19、rder shall be adjusted towithin 0.5 C of the reference temperature measuring device.6. Requirements for Moist Cabinets and Moist Rooms6.1 GeneralThe atmosphere in a moist cabinet or moistroom shall have a temperature of 23.0 6 2.0 C and a relativehumidity of not less than 95 %. The moisture in the a

20、tmosphereshall be saturated to the degree needed to ensure that theexposed surfaces of all specimens in storage will both lookmoist and feel moist at all times. All moist cabinets and moistrooms shall be equipped with a temperature recorder. The useof humidity recording devices is optional. Shelves

21、on whichfresh specimens are placed shall be level.6.1.1 The air in a moist cabinet or moist room must benearly saturated with moisture in order to provide specifiedstorage conditions. In many cases, saturation is below optimumduring periods when specimens are being placed in or removedfrom storage.

22、Measurements of relative humidity should not bemade at such obviously inopportune times.6.1.2 The air temperature inside the moist cabinet or moistroom shall be controlled with provisions made for heating orcooling, or both, as may be necessary. This shall be accom-plished in one of two ways:6.1.2.1

23、 Thermostatically control the air temperature withinthe moist cabinet or moist room when surrounding space is notconditioned. In this case the sensing element for the controlsshall be located inside the moist cabinet or moist room.6.1.2.2 Thermostatically control the space surrounding themoist cabin

24、et or moist room and manually control the tempera-ture within the moist cabinet or moist room.6.1.3 In either of the preceding cases, the laboratory shalldemonstrate the ability of the controls to maintain the requiredtemperature in the moist cabinet or moist room over anextended period of time. Dat

25、a from the temperature recorderthat indicates that the temperatures are within the temperaturelimits specified in 6.1 shall be required as evidence of thisability.6.2 Moist CabinetsAmoist cabinet shall be constructed ofdurable materials and the doors shall be tight-fitting. Thespecified relative hum

26、idity shall be maintained by the use ofone or more fog sprays, water sprays, or curtains of water onthe inner walls that are so directed that the discharge willcollect in a pool at or near the bottom of the moist storagesection.6.3 Moist Rooms:6.3.1 GeneralThe walls of a moist room shall be con-stru

27、cted of durable materials, and all openings shall be pro-vided with tight-fitting doors or windows (Note 3). Thespecified relative humidity may be maintained in any conve-nient and suitable manner (Note 4).NOTE 3Well insulated walls will substantially help maintain neces-sary conditions.NOTE 4A fog

28、spray found suitable for this purpose is shown in Fig.1.6.3.2 Moist Rooms Used in Cement TestingDurable shelv-ing that is properly shielded to prevent droplets of water fromfalling on the surfaces of freshly molded specimens shall beavailable within each moist room.6.3.3 Moist Rooms Used in Concrete

29、 TestingAtmosphericconditions within each moist room shall be such that testspecimens in storage shall have free water maintained on theirentire surface area at all times. Specimens shall not be exposedto dripping or running water.7. Requirements for Water Storage Tanks7.1 GeneralTanks shall be cons

30、tructed of non-corrodingmaterials. Provision for automatic control of water temperatureat 23.0 6 2.0 C shall be made where a tank is located in aroom not having temperature controlled within that range andin any other instance where difficulty in maintaining tempera-tures within the specified range

31、is encountered. With theexception of water storage tanks located in a moist room ormoist cabinet, all water storage tanks shall be equipped with atemperature recorder with its sensing element in the storagewater. For the purpose of temperature recording, a group ofwater storage tanks may be consider

32、ed one tank if thefollowing three conditions are met: (1) all the tanks areinterconnected with tubing that allows the water to flowbetween the tanks, (2) some means of circulation is providedbetween tanks, and (3) temperature variation between the tanksNOTE 1Cut three horizontal air slots around cir

33、cumference of hollowsphere using a 0.20 mm thick diamond lapidary saw covering 120 to 150each and spaced approximately 5 mm apart. Air passing through theseslots strikes the water (which is flowing over the outer surface of thesphere) to produce a spray.FIG. 1 Example of a Fog Spray for Maintaining

34、Relative Humidityin Moist Rooms (Full Scale)C511062must not exceed 1.0 C when checked and recorded weekly.The water in a storage tank shall be saturated with calciumhydroxide to prevent leaching of calcium hydroxide from thespecimens (Note 5). Water not saturated with calcium hydrox-ide (high-calciu

35、m hydrated lime) may affect test results due toleaching of lime from the test specimens and shall not be usedin storage tanks. To maintain saturation with calcium hydrox-ide, excess calcium hydroxide shall be present. For thepurposes of lime saturation to prevent leaching, lime meanshigh-calcium hyd

36、rated lime, not calcium carbonate(limestone)see Terminology C51. The water in the storagetank shall be thoroughly stirred at intervals not to exceed onemonth to help replace calcium ions that have depleted. Tanksshall be cleaned and refilled with water containing 3 g/L ofcalcium hydroxide at interva

37、ls not to exceed 24 months (Note6).NOTE 5pH is not a reliable indicator of lime saturation in storage tankwater since severe reductions in dissolved calcium ions can occur beforepH values are significantly reduced.NOTE 6The 3 g/L level is intended to provide a quantity of calciumhydroxide approximat

38、ely two times that required for initial saturation.7.2 Do not use continuously running fresh water or dem-ineralized water in storage tanks because it may effect testresults due to excessive leaching. A closed system, circulatingthe saturated lime water between or among storage tanks, maybe used.8.

39、Keywords8.1 cement paste; concrete; mixing room; moist cabinets;moist rooms; mortar; water storage tanksSUMMARY OF CHANGESCommittee C01 has identified the location of selected changes to this specification since the last issue,C 511 05, that may impact the use of this specification. (Approved Novemb

40、er 1, 2006)(1) Revised 5.1 and 5.2.1.(2) Revised 7.1.ASTM 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 any such patent ri

41、ghts, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either fo

42、r revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearin

43、g you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).C511063