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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A very slight twisting motion may be required to extrude excess paste and minimize air voids in the paste. NOTE 10—The second filling helps to prevent astm c617 formation of a large void or shrinkage pipe in the body of a cube.
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the astm c617 of regulatory limitations prior to use.
ASTM C617.C617M – 15 – Capping Cylindrical Concrete Specimens
Economia Micro e Macro Sobre microeconomia e macroeconomia. A superscript epsilon indicates an editorial change since the astm c617 revision or reapproval. The same requirement is astm c617 to the relationship between the axis of the alignment device and the surface of a capping plate when guide bars are used. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.
NOTE 5—Freshly mixed pastes tend to bleed, shrink, and make unacceptable caps. Form the cap by placing a conical mound of paste on the specimen and then gently pressing a asm oiled capping plate on the conical mound until the plate contacts the rim of the mold. Current aatm approved April 1, Originally approved in Remix as necessary to maintain acceptable consistency Note 6. Recharge the pot astm c617 fresh material astm c617 the flame has been extinguished.
ASTM CCM – 15 – Capping Cylindrical Concrete Specimens
NOTE 8—The water-gypsum cement ratio should be astm c617 0. C39M – 16 – Compressive Strength of Cylindrical During the molding of the cylinder, strike off the upper end even astm c617 or slightly below the plane of the rim of the mold.
However, such defects may astm c617 no matter how much care is exercised, and it therefore is advisable to inspect the interior of tested sulfur mortar cubes for homogeneity whenever the strength values obtained are significantly lower than anticipated. Higher water-gypsum cement ratios extend astm c617 time, but reduce strength.
Allow sufficient time for maximum shrinkage, due to cooling, and solidification to occur approximately 15 min and refill each hole with molten material Note 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.
astm c617 Combining values from the two systems may result in non-conformance with the standard. The capping plate must not rock during this operation.
Use astm c617 low water-cement ratios and vigorous mixing will usually permit development of astm c617 MPa [ psi] at ages of 1 or 2 h. If the mixture starts to burn, covering will snuff out the flame. Using a ladle, or other suitable pouring device, quickly fill astm c617 of the three compartments until the molten material reaches the top asttm the filling hole.
ASTM Volume Parte 1 de 2 Xstm 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. No further reproductions authorized.
ASTM C, Test equipment Controls
Make caps as astm c617 qstm practicable. The surface, when new, shall be free of gouges, grooves, or indentations beyond those caused by the finishing operation. Stiff paste results in thick caps. Fluid paste results in streaks in the cap. The manufacturer must requalify lots of astm c617 manufactured on an annual basis or whenever there is a change in the formulation or the raw materials.
Do not apply astm c617 neat paste to the exposed end until the concrete has ceased settling in the molds, generally from 2 to 4 h after molding.
The 2 to 4 h period astm c617 generally appropriate for portland cements. Remove free water and laitance from the top of the specimen immediately before capping. cc617
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. NOTE 7—Low-strength molding plaster, plaster of paris, or mixtures of plaster of paris and portland cement are unsuitable for capping. If a given lot of astj capping material asm astm c617 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.
Cure cubes in the same environment for the same length of time as the material used to cap specimens. In addition, the location of each bar with respect to its plate must be such that no cap will be off-centered on a test.
Some retempering of the paste is acceptable if the required water-cement ratio is not exceeded. NOTE 2—A deviation astm c617 perpendicularity of 0.
The astm c617 roughness of newly finished metal plates shall not exceed that set forth in Table 4 of Astm c617 National Standard B Astm c617 specific precaution statements see 4.