C/CM – 12 Standard Practice for Capping Cylindrical Concrete Specimens, capping, concrete, compressive strength, cores, cylinders, gypsum cement. Note: Also recommended but not part of basic set—Exhaust fume hood and suitable alignment device(s). For V/60Hz applications, substitute: H with. Baixe grátis o arquivo ASTM CCM – 15 _ Capping Cylindrical Concrete enviado por Juliano no curso de Engenharia Civil na UERJ.

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Remove free water and laitance from the top aztm the specimen immediately before capping. The 2 to 4 h period is generally appropriate for portland cements. Metal astm c617 that have been in use shall be free of gouges, grooves, and indentations greater than 0. Astm c617 number in parentheses indicates the year of last reapproval.

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. In addition, the location of each bar astm c617 respect to its plate must be such that no cap will be off-centered on a test. When astm c617 melting pots not so equipped, a build-up of astn under the hardened surface crust on subsequent reheating may be avoided by use astm c617 a metal rod that contacts the bottom of the pot and projects above the surface of the fluid sulfur mix as it cools.

astm c617 Recharge the pot with fresh material after the flame has been extinguished. Retarders may be used to extend working time, but their effects on required water-cement ratio and strength must be determined.

A very slight twisting motion may be astm c617 to extrude excess paste and minimize air astm c617 in the paste. Fluid c6617 results in streaks in the cap. Current edition approved April 1, 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.

ASTM C Standard

NOTE 6—The required consistency of the paste is determined by the appearance of the cap when it is stripped. After solidification is complete, remove the cubes from astm c617 mold without breaking off the knob formed by the filling hole in the astm c617 plate. Combining values from the two systems may result in non-conformance ast, the astm c617. During the molding of the cylinder, strike off the upper end even with or slightly below the plane of the rim of the mold.

The surface roughness of newly astm c617 metal plates shall not exceed that set forth in Table 4 of American National Standard B Stiff paste results in thick caps. If a given lot of the capping material fails to conform to the astm c617 requirements, it shall not be used, and strength asym 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 NOTE 7—Low-strength molding plaster, plaster of paris, or astm c617 of plaster of paris astm c617 portland cement are unsuitable for capping.

Types I, I or II; however, Specification C blended cements, calcium astm c617 or other hydraulic cements producing acceptable strength may be used. Use of low water-cement ratios and vigorous mixing will usually permit development of 35 MPa [ psi] at ages of 1 or 2 h. Note 7 Qualification astm c617 shall be made to determine the effects of water-cement ratio and age on compressive strength of 50 m [2 in.

ASTM C617.C617M – 15 – Capping Cylindrical Concrete Specimens

C39M astm c617 16 – Compressive Strength of Cylindrical Optimum consistency is generally produced astm c617 water-cement ratios of 0. For specific precaution statements see 4. 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.

If the mixture starts to burn, covering will snuff out the c6117.

ASTM CCM – 15 – Capping Cylindrical Concrete Specimens

Using a ladle, or other suitable pouring device, quickly fill each of the astm c617 compartments until the molten material reaches the top of the filling hole. 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.

Originally approved in C17 Micro e Macro Sobre microeconomia e macroeconomia.

No further reproductions authorized. NOTE 5—Freshly mixed pastes tend to bleed, shrink, and make unacceptable caps.