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 surface roughness of newly finished metal plates shall not exceed that set forth in Table 4 of American National Standard B Types I, I or II; however, Specification C blended cements, calcium aluminate or other hydraulic astj producing acceptable strength may be used.
ASTM Volume NOTE 10—The second filling helps to prevent the formation of a large void or shrinkage pipe in the body of a cube. Stiff paste results in thick caps.
The rod should be of sufficient size to conduct enough heat to the top on reheating to melt a ring around the rod first and thus avoid the development of pressure. A number in parentheses indicates the year of last reapproval. The surface, when new, shall be free of gouges, grooves, or indentations beyond those caused by the finishing operation.
NOTE 7—Low-strength molding plaster, plaster of paris, or mixtures of plaster of paris and c167 cement are unsuitable for capping. 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.
Fluid paste results in streaks in the cap. Optimum consistency is generally produced at water-cement ratios of 0. 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. 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. 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.
Metal plates that have been in use shall be free of gouges, grooves, and indentations greater than 0. Cure cubes in the same environment for the same length of time as ashm material used to cap specimens. NOTE 6—The required consistency of the paste is determined by the appearance of the c167 when it is stripped.
Economia Micro e Macro Sobre microeconomia e macroeconomia. Combining values from the two systems may result in non-conformance with the standard. Parte 1 de 2 Designation: The capping plate must not rock during this operation. A c67 slight twisting motion may be required to extrude excess paste and minimize air voids in the paste.
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 plate contacts the rim of the mold. 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.
See Test Methods C for alternative compaction procedures. 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. Remove free water and laitance from the top of the specimen immediately before capping. When using melting pots not so equipped, a build-up of pressure under the hardened surface crust on subsequent cc617 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
If the mixture starts to burn, covering will snuff out the flame. Using a ladle, or other suitable pouring device, quickly fill each of the three compartments until asstm molten material reaches the top of the filling hole.
Some retempering of the paste is acceptable if the required water-cement ratio is not exceeded. NOTE 8—The water-gypsum cement ratio should be between 0. NOTE 2—A deviation from perpendicularity of 0.
ASTM CCM – 15 – Capping Cylindrical Concrete Specimens
Current edition approved April 1, A superscript epsilon indicates an editorial change since the last revision or reapproval. Make caps as thin as practicable. Use of low water-cement ratios and vigorous mixing will usually permit development of 35 MPa [ psi] at ages of 1 or 2 h. Aastm 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. asttm
Remix as necessary to maintain acceptable consistency Note 6. NOTE 5—Freshly c67 pastes tend to bleed, shrink, and make unacceptable caps. No further reproductions authorized.
C39M – 16 – Compressive Strength of Cylindrical Atsm may be used to extend working time, but their effects on required water-cement ratio and strength must be determined. Originally approved in The 2 to 4 h period is generally appropriate for portland cements. Higher water-gypsum cement ratios extend working time, but reduce strength.
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. After solidification is complete, 6c17 the cubes from the mold without breaking off the knob formed by the filling hole in the cover plate.
A large metal ladle can be substituted for the rod.