Current edition approved April 1, If the mixture starts to burn, covering will snuff out the flame. Make caps as thin as practicable. Parte 1 de 2 Designation: 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.
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A very slight twisting motion may be required to extrude excess paste and minimize astm c617 voids in the paste. Cure cubes in the same environment for the same length of astm c617 as the material used to cap specimens. If the mixture starts to burn, covering will snuff out the flame. Carefully cover the capping plate and mold with a double layer of damp burlap and a polyethylene sheet to prevent drying. During the molding of the cylinder, strike off the upper end even with or slightly below the plane of the rim of the mold.
Economia Micro e Macro Sobre microeconomia e macroeconomia. For specific precaution statements see 4. NOTE 7—Low-strength molding plaster, plaster of paris, or mixtures of plaster of paris and portland cement are unsuitable for capping.
ASTM C Standard
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. See Test Methods C for alternative compaction procedures. No further reproductions astm c617. The capping plate must not rock during this operation.
NOTE 10—The second filling helps to prevent the formation of a large void or shrinkage pipe in the body astm c617 a cube. NOTE 5—Freshly mixed pastes tend to bleed, shrink, and make unacceptable caps. The 2 to astm c617 h period is generally appropriate for portland cements. Metal plates that have been in use shall be free of gouges, grooves, and indentations greater than 0.
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 adtm.
ASTM C617.C617M – 15 – Capping Cylindrical Concrete Specimens
Stiff paste results in thick caps. 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. Astm c617 free water and laitance from the top of the aastm immediately before capping. Current edition approved April 1, Higher water-gypsum cement ratios extend working time, but reduce strength.
A superscript epsilon indicates an editorial change since the last revision or reapproval.
Originally approved in Remix as necessary to maintain acceptable consistency Note 6. 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. 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.
Do not apply the neat paste to the exposed end astm c617 the concrete has ceased settling in the molds, astm c617 from 2 to 4 h after molding. NOTE 8—The water-gypsum cement ratio should be between 0. Parte 1 de 2 Designation: Some retempering of the paste is acceptable if the required water-cement ratio is not exceeded.
NOTE 6—The required consistency of the paste is determined by the appearance of the cap when it is stripped. The manufacturer must requalify lots of xstm manufactured on an annual basis or whenever there is a change in the formulation or the raw materials. The surface roughness of newly finished metal plates shall not exceed that set forth in Table astm c617 of American National Standard B 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.
Make aastm as thin as practicable.