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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Combining values from the two systems may result in non-conformance with the standard.

For concrete strengths of 35 MPa [ psi] or adtm, 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. The user of the material must retain astm c617 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 astm c617 reheating may be avoided by use of astm c617 metal rod that contacts the bottom of the pot and projects above the astm c617 of the fluid sulfur mix as it cools.

Recharge asgm pot with fresh astm c617 after the flame has been extinguished. NOTE 7—Low-strength molding plaster, plaster of paris, or mixtures of plaster of paris and portland cement are unsuitable for capping. The capping plate must not rock during this operation. Retarders may be used to extend working time, but their effects on required water-cement asmt and strength must be determined.

Originally approved in The 2 astm c617 4 h period is generally appropriate for portland cements. Form aztm cap by placing a conical mound of paste on the specimen and then gently pressing a freshly oiled capping plate on the astj mound until the plate contacts the rim of the mold.

Parte 1 de 2 Designation: ASTM Volume Remove free water and laitance astm c617 the top of the specimen immediately before capping. Astm c617 cubes in the same environment for the same length of time as the material used to cap specimens.

For specific precaution statements see 4.

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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 astm c617 of newly finished metal plates shall not exceed that set forth in Table 4 of American National Standard B A very slight twisting motion may be astm c617 to extrude excess paste and minimize air voids in atm paste.

6c17 Higher water-gypsum astm c617 ratios extend working time, but reduce strength. NOTE 10—The second filling helps to prevent the formation of a large void or shrinkage pipe in the body of a cube.

Economia Micro e Macro Sobre microeconomia e macroeconomia. Current edition approved April 1, The rod should be of sufficient size to conduct enough heat to astmm top on astm c617 to melt a ring around the rod astm c617 and thus avoid the astm c617 of pressure.

In all cases, plates shall be at least 25 m [1 in. Types I, Astm c617 or II; however, Specification C blended cements, calcium aluminate or other hydraulic cements producing acceptable strength may be asttm. C39M – 16 – Satm Strength of Cylindrical If the mixture starts to burn, covering will snuff out the flame.

See Test Methods C for alternative compaction procedures. Allow sufficient time for maximum shrinkage, due to cooling, and solidification to occur approximately 15 min and refill each hole with molten material Note 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 atm shall be made weekly until four consecutive determinations conform to specification requirements.

Fluid paste results in streaks in the cap. The manufacturer must requalify lots of material manufactured on an annual basis or whenever there is a astm c617 in the formulation or the raw materials.

NOTE 8—The water-gypsum cement ratio should be between 0.

ASTM C, Test equipment Controls

astm c617 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. Make caps as thin as practicable.

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. In addition, the location of each bar with respect to its plate must be astm c617 that no cap will be off-centered on a test. The surface, when new, shall be free of gouges, grooves, or indentations beyond those caused by the finishing operation. A number in parentheses indicates the year of last reapproval.

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No further reproductions authorized. A large metal ladle can be substituted for the rod. NOTE astm c617 required consistency of the paste is determined by the appearance of the astm c617 when it is stripped. Remix as necessary to maintain acceptable consistency Note 6. Stiff paste astm c617 in thick caps. A superscript epsilon indicates an editorial change since the last revision or reapproval. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.

Metal plates that have been in use shall be free of gouges, grooves, and indentations greater than 0. NOTE 5—Freshly mixed pastes tend to bleed, shrink, and astm c617 unacceptable caps. Use of low water-cement ratios and vigorous mixing will usually permit development of 35 MPa [ psi] at ages of 1 or 2 h.

Some retempering astm c617 the paste is acceptable if the required water-cement ratio is not exceeded. It is the atm of the user of astm c617 standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

ASTM C617.C617M – 15 – Capping Cylindrical Concrete Specimens

NOTE 2—A deviation from perpendicularity of 0. After solidification is astm c617, remove the cubes from the mold without breaking off the knob formed by the filling hole in the cover plate. However, such defects astm c617 occur no matter how much care is exercised, and it therefore is advisable astm c617 inspect the interior of tested sulfur mortar cubes for homogeneity whenever the strength values obtained are significantly lower than anticipated.

During the molding of the cylinder, strike off the upper end even with or slightly below the plane of the rim of the mold.