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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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.
ASTM C617.C617M – 15 – Capping Cylindrical Concrete Specimens
Types I, I or II; however, Specification C blended cements, calcium aluminate or other hydraulic cements producing acceptable strength may be used.
Allow sufficient time for maximum shrinkage, due to cooling, and solidification to occur approximately 15 min and refill each hole with molten material Note The surface roughness of newly finished metal plates shall not exceed that set forth in Table 4 of American National Standard B NOTE 8—The water-gypsum cement ratio should be between 0. Make caps as thin as practicable.
Optimum consistency is generally produced at water-cement ratios of 0. Retarders may be used to extend working time, but their effects on required water-cement ratio and strength must be determined. NOTE 10—The second filling helps to prevent the formation of a large void or shrinkage pipe in the body of a cube.
ASTM C, Test equipment Controls
After solidification is complete, remove the cubes from the mold without breaking off the knob formed by the filling hole in the cover plate.
NOTE 5—Freshly mixed pastes tend to bleed, shrink, and make unacceptable caps. However, such defects may occur 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.
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.
Some retempering of the paste is acceptable if the required water-cement ratio is not exceeded. Higher water-gypsum cement ratios extend working time, but reduce strength. A number in parentheses indicates the year of last reapproval.
Form the cap by placing a conical mound of paste on the specimen and then gently pressing a freshly oiled capping plate on the conical mound until the asrm contacts the rim of the mold. Economia Micro e Macro Sobre microeconomia e macroeconomia. During the molding of the cylinder, strike off the upper end even with or slightly below the plane of the rim of the mold.
A very slight twisting motion may be required to extrude excess paste and minimize air voids in atm paste. NOTE 7—Low-strength molding plaster, plaster of paris, or mixtures of plaster of paris and portland cement are unsuitable for capping. For specific precaution statements see 4.
The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Recharge the pot with fresh material after ashm flame has been extinguished.
Metal plates that have been in use shall be free of gouges, grooves, and indentations greater than 0. A superscript epsilon indicates an editorial change since the last revision or reapproval.
ASTM Volume 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. C39M – 16 – Compressive Strength of Cylindrical Note 7 C17 tests shall be made to determine the effects of water-cement ratio and age on compressive strength of 50 m [2 in.
ASTM CCM – 15 – Capping Cylindrical Concrete Specimens
The rod should be of sufficient size to conduct enough heat to the top on aetm to melt a ring around the rod first and thus avoid the development of pressure. 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.
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. Stiff paste results in thick caps. 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. NOTE 2—A deviation from perpendicularity of 0.