AASHTO M 152M M 152-2016 Standard Specification for Flow Table for Use in Tests of Hydraulic Cement.pdf

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1、Standard Specification for Flow Table for Use in Tests of Hydraulic Cement AASHTO Designation: M 152M/M 152-161Release: Group 1 (April 2016) ASTM Designation: C230/C230M-14 American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 249 Washington, D.C. 20

2、001 TS-3a M 152M/M 152-1 AASHTO Standard Specification for Flow Table for Use in Tests of Hydraulic Cement AASHTO Designation: M 152M/M 152-161Release: Group 1 (April 2016) ASTM Designation: C230/C230M-14 1. SCOPE 1.1. This specification covers requirements for the flow table and accessory apparatus

3、 (see Note 1) used in making flow tests for consistency of mortars in tests of hydraulic cement such as, but not limited to, ASTM C1437. Note 1To help clarify the design of the flow table and accessory apparatus, see the drawing in Figure 1 (SI units) or Figure 2 (U.S. Customary units). This drawing

4、 is for informational purposes only. 1.2. The values stated in either SI units or inch-pound units shall be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system must be used independently of the other. Combining values from the two sy

5、stems may result in nonconformance with the standard. It is permissible to use an inch-pound caliper and mold with an SI flow table or an SI caliper and mold with an inch-pound flow table. It is not permissible to mix an SI mold with an inch-pound caliper or an inch-pound mold with an SI caliper. 1.

6、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. 2. REFERENCED D

7、OCUMENTS 2.1. ASTM Standards: C1437, Standard Test Method for Flow of Hydraulic Cement Mortar Manual of Cement Testing, Annual Book of ASTM Standards, Volume 04.01 3. FLOW TABLE AND FRAME 3.1. The flow table apparatus shall consist of an integrally cast rigid iron frame and a circular rigid tabletop

8、 255.0 2.5 mm 10 0.1 in. in diameter, with a shaft attached perpendicular to the tabletop by means of a screw thread. The tabletop and shaft with contact shoulder shall be mounted on a frame in such a manner that it can be raised and dropped vertically through the specified height of 12.7 0.13 mm 0.

9、500 0.005 in. for new tables and 12.7 0.38 mm 0.500 0.015 in. for tables in use, by means of a rotated cam. The tabletop shall have a fine machined plane surface, free of blowholes and surface defects. The top shall be scribed with eight equidistant lines 68 mm 25/8in. long, extending from the outsi

10、de circumference toward the center of the table. Each line shall end with a scribed arc, 6 mm 1/4in. long, whose center point is 2016 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-3a M 152M/M 152-2 AASHT

11、O the center of the table top with a radius of 59.5 mm 23/8in. The scribe lines shall be made with a 60-degree tool to a depth of 0.25 mm 0.01 in. The tabletop shall be of cast brass or bronze having a Rockwell hardness number not less than 25 HRB with an edge thickness of 7.5 mm 0.3 in. and shall h

12、ave six integral radial stiffening ribs. The tabletop and attached shaft shall have a mass of 4.08 0.05 kg 9 0.1 lb, and the mass shall be symmetrical around the center of the shaft. 3.2. The cam and vertical shaft shall be of medium carbon machinery steel, hardened on the end of the shaft contactin

13、g the cam and the tip of the cam contacting the shaft. The shaft shall be straight, and the difference between the diameter of the shaft and the diameter of the bore of the frame shall be not less than 0.05 mm 0.002 in. and not more than 0.08 mm 0.003 in. for new tables and shall be maintained at 0.

14、05 to 0.25 mm 0.002 to 0.010 in. for tables in use. The end of the shaft shall not fall upon the cam at the end of the drop, but shall make contact with the cam not less than 120 degrees from the point of drop. The face of the cam shall be a smooth spiraled curve of uniformly increasing radius from

15、13 to 32 mm 1/2to 11/4in. in 360 degrees, and there shall be no appreciable jar as the shaft comes into contact with the cam. The cam shall be so located, and the contact faces of the cam and shaft shall be such that the table does not rotate more than one revolution in 25 drops. The surfaces of the

16、 frame and of the table that come into contact at the end of the drop shall be maintained smooth, plane, and horizontal and parallel with the upper surface of the table and shall make continuous contact over a full 360 degrees. 3.3. The supporting frame of the flow table shall be integrally cast of

17、fine-grained, high-grade cast iron. The frame casting shall have three integral stiffening ribs extending the full height of the frame and located 120 degrees apart. The top of the frame shall be chilled to a depth of approximately 6.0 mm 1/4in., and the face shall be ground and lapped square with t

18、he bore to give 360 degrees contact with the shaft shoulder. The underside of the base of the frame shall be ground to secure complete contact with the steel plate beneath. 3.4. The flow table shall be driven by a motor (see Note 2) connected to the camshaft through an enclosed worm gear speed reduc

19、er and flexible coupling. The speed of the camshaft shall be approximately 100 rpm. The motor drive mechanism shall not be fastened or mounted on the table base plate or frame. Note 2A 40 W (1/20hp) motor has been found adequate. 3.5. The performance of a flow table shall be considered satisfactory

20、if, in verification tests, the table gives a flow value that does not differ by more than five percentage points from flow values obtained with suitable calibration materials.2(See Note 3.) Perform the verification at least every 21/2years. Note 3Some causes of and solutions to unsatisfactory perfor

21、mance of the flow table may be found in the section on flow tables in the ASTM Manual of Cement Testing. 2016 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.Figure 1Flow Table and Accessory Apparatus (SI Uni

22、ts) TS-3aM 152M/M 152-3AASHTO 2016 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.Figure 2Flow Table and Accessory Apparatus (U.S. Customary Units) TS-3aM 152M/M 152-4AASHTO 2016 by the American Association

23、of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-3a M 152M/M 152-5 AASHTO 4. FLOW TABLE MOUNTING 4.1. The flow table frame shall be tightly bolted to a cast iron or steel plate at least 25 mm 1 in. thick and 250 mm 10 in. square. The

24、top surface of this plate shall be machined to a smooth plane surface. The plate shall be anchored to the top of a concrete pedestal by four 13-mm 1/2-in. bolts that pass through the plate and are imbedded at least 150 mm 6 in. in the pedestal. The pedestal shall be cast inverted on the base plate.

25、A positive contact between the base plate and the pedestal shall be obtained at all points. No nuts or other such leveling devices shall be used between the plate and the pedestal. Leveling shall be effected by suitable means under the base of the pedestal. 4.2. The pedestal shall be 250 to 275 mm 1

26、0 to 11 in. square at the top, and 375 to 400 mm 15 to 16 in. square at the bottom, 625 to 750 mm 25 to 30 in. in height, and shall be of monolithic construction cast from concrete having a density of at least 2240 kg/m3140 lb/ft3. A stable gasket cork padding, 13 mm 1/2 in. thick and the same size

27、as the pedestal bottom or four pieces of padding 13 mm 1/2 in. thick and approximately 100 mm 4 in. square, shall be inserted under the pedestal of the four corners, respectively. The flow table shall be checked frequently for levelness of the tabletop, stability of the pedestal and tightness of bol

28、ts and nuts in the table base and the pedestal table. (A torque of 27 Nm 20 lbft is recommended when tightening those fastenings.) 4.3. The tabletop, after the frame has been mounted on the pedestal, shall be level along two diameters at right angles to each other in both the raised and lowered posi

29、tions. 5. FLOW TABLE LUBRICATION 5.1. The vertical shaft of the table shall be kept clean and shall be lightly lubricated (see Note 4) with a light oil (SAE-10). Oil shall not be present between the contact faces of the tabletop and the supporting frame. Oil on the cam face will lessen wear and prom

30、ote smoothness of operation. The table should be raised and permitted to drop a dozen or more times just prior to use if it has not been operated for some time. Note 4It has been demonstrated that an absence of lubrication on the table shaft will significantly reduce the flow reading. 6. MOLD AND CA

31、LIPER 6.1. The conical mold for casting the flow specimen shall be of cast bronze or brass. The Rockwell hardness number of the metal shall be not less than 25 HRB. The height of the mold shall be 50.0 0.5 mm 2.00 0.02 in. The diameter of the top opening shall be 70.0 0.5 mm 2.75 0.02 in. for new mo

32、lds and 70.0 + 1.3 and 0.5 mm 2.75 + 0.05 and 0.02 in. for molds in use. The diameter of the bottom opening shall be 100.0 0.5 mm 4.00 0.02 in. for new molds and 100.0 + 1.3 and 0.5 mm 4.00 + 0.05 and 0.02 in. for molds in use. The surfaces of the base and top shall be parallel and at right angles t

33、o the vertical axis of the cone. The mold shall have a minimum wall thickness of 5 mm 0.2 in. The outside of the top edge of the mold shall be shaped so as to provide an integral collar for convenient lifting of the mold. All surfaces shall be machined to a smooth finish. A circular shield approxima

34、tely 255 mm 10 in. in diameter, with a center opening approximately 100 mm 4 in. in diameter, made of nonabsorbing material not attacked by the cement, shall be used with the flow mold to prevent mortar from spilling on the tabletop. 6.2. A caliper consisting of one fixed jaw and one jaw movable alo

35、ng a permanent scale shall be provided for measuring the diameter of the mortar after it has been spread by the operation of the table. The scale shall be machine divided into 40 increments with 4.0 mm 0.16 in. between 2016 by the American Association of State Highway and Transportation Officials.Al

36、l rights reserved. Duplication is a violation of applicable law.TS-3a M 152M/M 152-6 AASHTO divisions with major division lines every five divisions and the increment number every ten divisions (see Note 5). The construction and accuracy of the caliper shall be such that the distance between the jaw

37、s shall be 100 0.25 mm 4 0.01 in. when the indicator is set at zero. Note 5The caliper is graduated to indicate one fourth of the actual flow percentage, so that the readings of four measurements on the caliper may be added to give the flow value without the necessity of calculating the average of f

38、our individual measurements of the total flow. 7. KEYWORDS 7.1. Flow; hydraulic cement; portland cement. 1This method agrees with ASTM C230/C230M-14. 2Such material may be obtained from the Cement and Concrete Reference Laboratory at the National Institute of Standards and Technology, Washington, DC 20234. 2016 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.