Normal Consistency...
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: C187 − 16
American Association State Highway and Transportation Officials Standard AASHTO No.: T 129
Standard Test Method for
Amount of Water Required for Normal Consistency of Hydraulic Cement Paste1 This standard is issued under the fixed designation C187; the number immediately following the designation indicates the year of original adoption or, in 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.
1. Scope* 1.1 This test method covers the determination of the normal consistency of hydraulic cement. 1.2 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. See 1.4 for a specific warning statement. 1.4 Warning—Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure. The use of gloves, protective clothing, and eye protection is recommended. Wash contact area with copious amounts of water after contact. Wash eyes for a minimum of 15 min. Avoid exposure of the body to clothing saturated with the liquid phase of the unhardened material. Remove contaminated clothing immediately after exposure.2
C1005 Specification for Reference Masses and Devices for Determining Mass and Volume for Use in the Physical Testing of Hydraulic Cements D1193 Specification for Reagent Water E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods 3. Terminology 3.1 Normal consistency is defined in Terminology standard C219. 4. Significance and Use 4.1 This test method is intended to be used to determine the amount of water required to prepare hydraulic cement pastes with normal consistency, as required for certain standard tests. 5. Apparatus 5.1 Reference Masses and Devices for Determining Mass, conforming to the requirements of Specification C1005. The devices for determining mass shall be evaluated for precision and bias at a total load of 1000 g. 5.2 Glass Graduates, 200 or 250-mL capacity, and conforming to the requirements of Specification C1005.
2. Referenced Documents 2.1 ASTM Standards:3 C219 Terminology Relating to Hydraulic Cement C305 Practice for Mechanical Mixing of Hydraulic Cement Pastes and Mortars of Plastic Consistency C511 Specification for Mixing Rooms, Moist Cabinets, Moist Rooms, and Water Storage Tanks Used in the Testing of Hydraulic Cements and Concretes
1 This test method is under the jurisdiction of ASTM Committee C01 on Cement and is the direct responsibility of Subcommittee C01.22 on Workability. Current edition approved Dec. 1, 2016. Published December 2016. Originally approved in 1944. Last previous edition approved in 2011 as C187 – 11ε1. DOI: 10.1520/C0187-16. 2 Section on Safety, Manual of Cement Testing, Annual Book of ASTM Standards, Vol 04.01. 3 For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [emailprotected]. For Annual Book of ASTM Standards volume information, refer to the standard’s Document Summary page on the ASTM website.
5.3 Vicat Apparatus—The Vicat apparatus shall consist of a frame A (Fig. 1) bearing a movable rod B, weighing 300 g, one end C, the plunger end, being 10 mm in diameter for a distance of at least 50 mm, and the other end having a removable needle D, 1 mm in diameter and 50 mm in length. The rod B is reversible, and can be held in any desired position by a set screw E, and has an adjustable indicator F, which moves over a scale (graduated in millimetres) attached to the frame A. The paste is held in a rigid conical ring G, resting on a plane nonabsorptive square base plate H, about 100 mm on each side. The rod B shall be made of stainless steel having a hardness of not less than 35 HRC (See Note 1), and shall be straight with the plunger end which is perpendicular to the rod axis. The ring shall be made of a noncorroding, nonabsorbent material, and shall have an inside diameter of 70 mm at the base and 60 mm at the top, and a height of 40 mm. In addition to the above, the Vicat apparatus shall conform to the following requirements:
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C187 − 16 7.2 Molding Test Specimen—Quickly form the cement paste, prepared as described in 7.1, into the approximate shape of a ball with gloved hands. Then toss six times through a free path of about 150 mm from one hand to another so as to produce a nearly spherical mass that may be easily inserted into the Vicat ring with a minimum amount of additional manipulation. Press the ball, resting in the palm of one hand, into the larger end of the conical ring G, Fig. 1, held in the other hand, completely filling the ring with paste. Remove the excess at the larger end by a single movement of the palm of the hand. Place the ring on its larger end on the base plate H, and slice off the excess paste at the smaller end at the top of the ring by a single oblique stroke of a sharp-edged trowel held at a slight angle with the top of the ring, and smooth the top, if necessary, with a few light touches of the pointed end of the trowel. During these operations of cutting and smoothing, take care not to compress the paste.
FIG. 1 Vicat Apparatus Weight of movable rod Diameter of plunger end of rod Diameter of needle Inside diameter of ring at bottom Inside diameter of ring at top Height of ring Graduated scale
300 ± 0.5 g 10 ± 0.05 mm 1 ± 0.05 mm 70 ± 3 mm 60 ± 3 mm 40 ± 1 mm The graduated scale, when compared with a standard scale accurate to within 0.1 mm at all points, shall not show a deviation at any point greater than 0.25 mm.
NOTE 1—The requirement that the rod be made of stainless steel shall apply only to new Vicat apparatus or replacement rods and not to equipment in use which meets the other requirements of this test method.
5.3.1 Vicat apparatus and vicat ring shall be inspected and checked for conformance to this test method at least every 21⁄2 years. 5.4 Flat Trowel, having a sharpened straight-edged steel blade 100 to 150 mm in length.
7.3 Consistency Determination—Center the paste confined in the ring, resting on the plate, under the rod B, Fig. 1, the plunger end C of which shall be brought in contact with the surface of the paste, and tighten the set-screw E. Then set the movable indicator F to the upper zero mark of the scale, or take an initial reading, and release the rod immediately. Release the rod at a time not exceeding 30 s after completion of mixing. The apparatus shall be free of all vibrations during the test. The paste shall be of normal consistency when the rod settles to a point 10 6 1 mm below the original surface in 30 s after being released. Make trial pastes with varying percentages of water until the normal consistency is obtained. Make each trial with fresh cement. 8. Calculation 8.1 Calculate the amount of water required for normal consistency as the mass of water divided by the mass of dry cement, expressed as a percentage. Calculate the mass ratio to the nearest 0.1 % and report the mass ratio to the nearest 0.5 %.
6. Temperature and Humidity
9. Precision and Bias
6.1 The temperature of the air and mixing water shall conform to the requirements of Specification C511.
9.1 The single operator-instrument precision has been found to be 0.25 (1S), and the multilaboratory precision has been found to be 0.35 (1S) as defined in Practice E177; therefore, the results of two properly conducted tests by the same operator in a laboratory should agree within 0.7 percentage point, and test results between two laboratories should agree with 1.0 percentage point 95 % of the time.
6.2 The relative humidity of the laboratory shall conform to the requirements of Specification C511. 7. Procedure 7.1 Preparation of Cement Paste—Mix 650 g of cement with a measured quantity of water following the procedure prescribed in the Procedure for Mixing Pastes of Practice C305. The water shall conform to the numerical limits of Specification D1193 for Type III or Type IV grade of reagent water.
10. Keywords 10.1 consistency; normal consistency; Vicat needles
For additional useful information on details of cement test methods, reference may be made to the “Manual of Cement Testing,” which appears in the Annual Book of ASTM Standards, Vol 04.01.
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C187 − 16 SUMMARY OF CHANGES Committee C01 has identified the location of selected changes to this standard since the last issue (C187 – 11ε1) that may impact the use of this standard. (Approved Dec. 1, 2016.) (1) Section 5.3.1 was added. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of 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 and if not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you should make 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 above address or at 610-832-9585 (phone), 610-832-9555 (fax), or [emailprotected] (e-mail); or through the ASTM website (www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222 Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http://www.copyright.com/
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