ASTM C230/C230M-20 pdf free download.Standard Specification for Flow Table for Use in Tests of Hydraulic Cement.
1 .1 This specification covers requirements for the flow table and accessory apparatus (Note 1) used in making flow tests for consistency of mortars in tests of hydraulic cement, such as hut not limited to Test Method C 1437.
NOTE I—To help clarify the design of the flow table and accessory apparatus see the drawing in Fig. I IFig. 21. This drawing is for informational purposes only.
1.2 The values stated in either SI units or inch-pound units are to he regarded separately as standard. The values stated in each system may not be exact equivalents: therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. it is permissible to use an inch-pound caliper and mold with a SI flow table or a SI caliper and mold with an inch-pound flow table. Ii is not permissible to mix a SI mold with an inch-pound caliper or an inch-pound mold with a SI caliper.
4. Flow Table and Frame
4.1 The flow table apparatus shall consist of an integrally cast rigid iron frame and a circular rigid table top 10 ± 0.1 in. [255 ± 2.5 mm] in diameter, with a shaft attached perpendicular to the table top by means of a screw thread. The table top and shaft with contact shoulder shall he mounted on a frame in such a manner that it can be raised and dropped vertically through the specified height of 0.500 ± 0.005 in. [12.7 ± 0.13 mm] for new tables and of 0.500 ± 0.015 in. 112.7 ± 0.38 mm] for tables in use, by means of a rotated cam. The table top shall have a tine machined plane surface, free of hlowholes and surface detects. The top shall be scrihed with eight equidistant lines 2/8 in. 168 mm] long, extending from the outside circumference toward the center of the table. Each line shall end with a scribed arc, 1/4 in. [6 mm] long, whose center point is the center of the table top with a radius of 23/x in. [59.5 mm]. The scribe lines shall be made with a 60° tool to a depth of 0.01 in. [0.25 mm]. The table top shall be of cast brass or bronze having a Rockwell hardness number not less than 25 HRB with an edge thickness of 0.3 in. [7.5 mm], and shall have six integral radial stiffening ribs. The table top and attached shaft shall weigh 9 ± 0.1 lb [4.08 ± 0.05 kg] and the weight shall be symmetrical around the center of the shaft.
4.2 The cam and vertical shaft shall be of medium carbon machinery steel, hardened on the end of the shaft contacting 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 0.002 in. [0.05 mm] and not more than 0.003 in.[0.08 mm] for new tables and shall he maintained at 0.002 to 0.010 in. 10.05 to 0.25 rnml 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° from the point of drop. The face of the cam shall he a smooth spiraled curve of uniformly increasing radius from ½ to 1 ¼ in.ASTM C230/C230M pdf download.