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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NOTE 8—The water-gypsum cement ratio should be between 0. NOTE 2—A deviation from perpendicularity of 0. Parte 1 qstm 2 Designation: The rod should be of sufficient size to conduct enough heat to the top on reheating to melt a ring around the rod first and thus avoid the development of pressure.
ASTM C617.C617M – 15 – Capping Cylindrical Concrete Specimens
The 2 to 4 h period is generally appropriate for portland cements. Types I, I or II; however, Specification C blended cements, calcium aluminate or other hydraulic cements producing acceptable strength may be used.
Stiff asstm results in thick caps.
Remove free water and laitance from the top of the specimen immediately before capping. NOTE 6—The required consistency of the paste is determined by the appearance of the cap when it is stripped.
NOTE 7—Low-strength molding plaster, plaster qstm paris, or mixtures of plaster of paris and portland cement are unsuitable for capping. Metal plates that have been in use shall be free of gouges, grooves, and indentations greater than 0. Optimum consistency is generally produced at water-cement ratios of 0.
The same requirement is applicable to the relationship between the axis of the alignment device and the surface of a capping plate when guide bars are used. Cure cubes in the same environment for the same length of time as the material used to cap specimens. C39M – 16 – Compressive Strength of Cylindrical The capping plate must not rock during this operation. Use of low water-cement ratios and vigorous mixing will usually permit development of 35 MPa [ psi] at ages of 1 or 2 h.
Remix as necessary to maintain acceptable consistency Note 6. For specific precaution statements see 4. Carefully cover the capping plate and mold with a double layer of damp burlap and a polyethylene sheet to prevent drying.
Allow sufficient time for maximum shrinkage, due to cooling, and solidification to occur approximately 15 min and refill each hole with molten material Note A large metal ladle can be substituted for the rod.
ASTM C Standard
See Test Methods C for alternative compaction procedures. A very slight twisting motion may be required to extrude excess paste and minimize air voids in the paste. Some retempering of the paste is acceptable if the required water-cement ast is not exceeded. A number in parentheses indicates the year of last reapproval. Recharge the pot with fresh material after the flame has been extinguished. NOTE 5—Freshly mixed pastes tend to bleed, shrink, and make unacceptable caps.
If the mixture starts to burn, covering will snuff out the flame. If a given lot of the capping material fails to conform to the strength requirements, it shall not be used, wstm strength tests of the replacement material shall be made weekly until four consecutive determinations conform to specification requirements.
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.
Economia Micro e Macro Sobre microeconomia e macroeconomia. In all cases, plates shall be at least 25 m [1 in. NOTE 10—The second filling helps to prevent the formation of a large void or shrinkage pipe in the body of a cube. 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.
Combining values from the two systems may result in non-conformance with the standard. For concrete strengths of 35 MPa [ psi] or greater, sulfur mortar caps must c671 allowed to harden at least 16 h before testing, unless a shorter time has been shown to be suitable as specified in 5.
Make caps as thin as practicable. Do not apply the neat paste to the exposed end until the concrete has ceased settling in the molds, generally from 2 to 4 h after molding.
The surface, when new, shall be free of gouges, grooves, or indentations beyond those caused by the finishing operation. Fluid paste results in streaks in the cap.
Higher water-gypsum cement ratios extend working time, but reduce strength. A superscript epsilon indicates an editorial change since the last revision or reapproval. Form the cap by placing c6177 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. The surface roughness of newly finished metal plates shall not exceed that set forth in Table 4 of American National Standard B Originally approved in