ASTM C230/C230M:20 pdf free download – Standard Specification for Flow Table for Use in Tests of Hydraulic Cement.
The cam shall be so located and the contact faces of the cain and shaft shall be such that the table does not rotate more than one revolution in 25 drops. The surfaces of the frame and of the table that come into contact at the end of the drop shall be maintained smooth, plane, and horliontal and parallel with the upper sLirface of the table and shall ma e continuous contact over a lull 360°.
4.3 The supporting frame of the how table shall be integrally cast of line-grained. high-grade cast iron. The frame casting shall have thrce integral stiffening ribs extending the full height of the frame and located I 20 apart. The top of the frame shall be chilled to a depth of approximately ¼ in.
16 mml, and the face shall he ground and lapped square with the bore to give 360° contact with the shaft shoulder. The underside of the base of the frame shall be ground to secure a complete contact with the steel plate beneath.
4.4 The flow table shall be driven by a motor (Note 2), connected to the cam shaft through an enclosed worm gear speed reducer and flexible coupling. The speed of the cam shaft shall be approximately 100 r/min. The motor drive mechanism shall not be fastened or mounted on the table base plate or frame.
Noit 2—A ½o-hp (44) WI motor has been fliund adequate.
4.5 The performance of a flow table shall be considered satisfactory if, in verification tests, the table gives a (low value that does not differ by more than 5 percentage poins from flow values obtained with a suitable calibration material (see Note 3),3.4 Perform the verification at least every 2½ years.
Non 3—Some causes of and solutions to unsatisfactory performance of the flow table may be Found in the section on flow laNes in the ASTM Manual of Tessing.
5. Flow Table Mounting
5.1 The how table frame shall be tightly bolted to a cast iron or steel plate at least I in. 125 mmj thick and 10 in. 1254) mml square. The lop surface of this plate shall be machined to a smooth plane surface. The plate shall he anchored to the top of a concrete pedestal by four ½-in. 113 mml bolts that pass through the plate and are imbedded at least 6 in. [ISO mrnl in the pedestal. The pedestal shall be cast inverted on the base plate. 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 eflecred by suitable means under the base of the pedestal.