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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Combining values from the two systems may result in non-conformance with the standard. Optimum consistency is generally produced at water-cement ratios of 0.
Recharge the pot with fresh material after the flame has been extinguished. NOTE 2—A deviation from perpendicularity of 0. A large metal ladle can be substituted for the rod. 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.
The manufacturer must requalify lots of material manufactured on an annual basis or whenever there is a change in the formulation or the raw materials. A number in parentheses indicates the year of last reapproval. The capping plate must not rock during this operation. Using a ladle, or other suitable pouring device, quickly fill each of the three compartments until the molten material reaches the top of the filling hole. c6617
No astn reproductions authorized. Parte 1 de 2 Designation: NOTE 5—Freshly mixed pastes tend to bleed, shrink, and make unacceptable caps. A very slight twisting motion may be required to extrude excess paste and minimize air voids in the paste.
The surface roughness of newly finished metal plates shall not exceed that set forth in Table 4 of American National Standard B See Test Methods C for alternative compaction procedures. A superscript epsilon indicates an editorial change since the last ast, or reapproval.
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. 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 d617 pot and projects above the surface of ast fluid sulfur mix as it cools.
Use of low water-cement ratios and vigorous mixing will usually permit development of 35 MPa [ psi] at ages of 1 or 2 h.
The 2 to 4 h period is generally appropriate for portland cements. If a given lot of the capping material fails to conform to the strength requirements, it shall not be used, and strength asmt of the replacement material shall be made weekly until four consecutive determinations conform to specification requirements. Remove free water and laitance from the top of the specimen immediately before capping.
Types I, I or Adtm however, Specification C blended cements, calcium aluminate or other hydraulic cements producing acceptable strength may be used. Stiff paste results in thick caps. NOTE 8—The water-gypsum cement ratio should be between 0. Make caps as thin as practicable. Allow sufficient time for maximum shrinkage, due to cooling, and solidification to occur approximately 15 min and refill each hole with molten material Note NOTE 10—The second filling helps to cc617 the formation of a large void or shrinkage pipe in the body of a cube.
Current edition approved April 1, Retarders may be used to extend working time, but their effects on required water-cement ratio and strength must be determined. During the molding of the cylinder, strike off the upper end even with or slightly below the plane of the rim of the mold. ASTM Volume 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.
D617 the mixture starts to burn, covering will snuff out the flame. C39M – 16 – Compressive Strength of Cylindrical 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 rod should astj 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.