All the Controls products ASTM C standard. Enter now!. ASTM C Standard Practice for Capping Cylindrical Specimens. P. F NA. Procedure. 1. Prepare sulfur mortar by heating to a temperature. Note: Also recommended but not part of basic set—Exhaust fume hood and suitable alignment device(s). For V/60Hz applications, substitute: H with.
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A large metal ladle can be substituted for the rod. No further reproductions authorized.
ASTM C – 10 Standard Practice for Capping Cylindrical Concrete Specimens
Fluid paste results in streaks in the cap. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Parte 1 de 2 Designation: Types I, I or II; however, Specification C blended cements, calcium aluminate or other hydraulic cements producing acceptable strength may be used.
Form the cap by placing a conical mound of paste on the specimen and then gently pressing a freshly oiled capping plate on the conical mound until the plate contacts the rim of the mold. A number in parentheses indicates the year of last reapproval. In addition, the location of each bar with respect to its plate must be such that no cap will be ashm on a test.
For specific precaution statements see 4. The surface, when new, shall be free of gouges, grooves, or indentations beyond those caused by the finishing operation. The capping plate must not rock during this operation.
NOTE 8—The water-gypsum cement ratio should be between 0. Combining values from the two systems may result in non-conformance with the standard.
Note 7 Qualification tests shall be made to determine the effects of water-cement ratio and age on compressive strength of 50 m [2 in. Stiff paste results in thick caps. The user of the material must retain a copy of the qualification results, and the dates of manufacture of material qualified and of the material currently being used. A very slight twisting motion may be required to extrude excess paste and minimize air voids in the paste.
ASTM C, Test equipment Controls
When using melting pots not so equipped, a build-up of pressure under the hardened surface crust on subsequent reheating may be avoided by use of a metal rod that contacts the bottom of the pot and projects above the surface of the fluid sulfur mix as it cools. Asym 7—Low-strength molding plaster, plaster of paris, or mixtures of plaster of paris and portland cement are unsuitable for capping.
The 2 to 4 h period x617 generally appropriate for portland cements. For concrete strengths of 35 MPa [ psi] or greater, sulfur mortar caps must be allowed to harden at least 16 h before testing, unless a shorter time has been shown to be suitable as specified in 5. Remix as necessary to maintain acceptable consistency Note 6. Originally approved in C167 6—The required consistency of the paste is determined by the appearance of the cap when it is stripped.
ASTM C617.C617M – 15 – Capping Cylindrical Concrete Specimens
Retarders may be used to extend working time, but their effects on required water-cement ratio and strength must be determined. The surface roughness of newly finished metal plates shall not exceed that set forth in Table 4 of American National Standard B Using a ladle, or other suitable pouring device, quickly fill each of the three compartments until the molten material reaches the top of the awtm hole.
Recharge the pot with fresh material after the flame has been extinguished. See Test Methods C for alternative compaction procedures. If a given lot of the capping material fails to conform to the strength requirements, it shall not be used, and strength tests of the replacement material shall be made weekly until four consecutive determinations conform to specification requirements. Allow sufficient time for maximum shrinkage, due to cooling, and solidification to occur approximately 15 min and refill each hole with molten material Note In all cases, plates shall be at least 25 m [1 in.
Carefully cover the capping plate and mold with a double layer of damp burlap and a polyethylene sheet to prevent drying.
Use of low water-cement ratios and vigorous mixing will usually permit development of 35 MPa [ psi] at ages of 1 or 2 h. Do not apply the neat paste to the exposed end until the concrete has ceased settling in asrm molds, generally from 2 to 4 h after molding.
NOTE 2—A v617 from perpendicularity of 0. Some retempering of the paste is acceptable if the required water-cement ratio is not exceeded. ASTM Volume