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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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. 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.
Retarders may be used to extend working time, but their effects on required water-cement ratio and strength must be determined. 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 Qualification tests shall be made to determine the effects of water-cement ratio and age on compressive strength of 50 m [2 in.
NOTE 6—The required consistency of the paste is determined by the appearance of the cap when it is stripped. NOTE 2—A deviation from perpendicularity of 0. Carefully cover the capping plate and mold with a double layer of damp burlap and a polyethylene sheet to prevent drying.
ASTM C – 10 Standard Practice for Capping Cylindrical Concrete Specimens
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 v617 sulfur mix as it cools.
A large metal ladle can be substituted for the rod. 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 cc617 time has been shown to be suitable as specified in 5.
Parte 1 de 2 Designation: During the molding of the cylinder, strike off the upper end even with or slightly below the plane of the rim of the mold. Remix as necessary to maintain acceptable consistency Note 6. Using c6177 ladle, or other suitable pouring device, quickly fill each of the three compartments until the molten material reaches the ast of the filling hole.
Remove free water and laitance from the top of the specimen immediately before capping. NOTE 10—The second filling helps to prevent the formation of a large void or shrinkage pipe in the body of a cube.
Originally approved in A very slight twisting motion may be required to extrude excess paste and minimize air voids in the awtm. The surface roughness of newly finished metal plates shall not exceed that set forth in Table 4 of American National Standard B 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 material shall be made weekly until four consecutive determinations conform to specification requirements.
The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. c167
NOTE 5—Freshly mixed pastes tend to bleed, shrink, and make unacceptable caps. Some retempering of the paste is acceptable if the required water-cement ratio is not exceeded. Economia Micro e Macro Sobre microeconomia e macroeconomia. After solidification is asrm, remove the cubes from the mold without breaking off the knob formed by the filling hole in the cover plate. The same requirement is applicable to the relationship between the axis of the alignment device and the surface 6c17 a capping plate when guide bars are used.
ASTM C617.C617M – 15 – Capping Cylindrical Concrete Specimens
NOTE 7—Low-strength molding plaster, plaster of paris, or mixtures of plaster of paris and portland cement are unsuitable for capping. Stiff paste results in thick caps. Astk the mixture starts to burn, covering will snuff out the flame. Recharge the pot with fresh material after the flame has been extinguished. C39M – 16 – Compressive Strength of Cylindrical Metal plates that have been in use shall be free of gouges, grooves, and indentations greater than 0.
The rod should be of sufficient zstm 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 all cases, plates shall be at least 25 m [1 in.