28 Jan ASTM C Standard Practice for Capping Cylindrical Specimens. P. F NA. Procedure. 1. Prepare sulfur mortar by heating to a temperature. Baixe grátis o arquivo ASTM CCM – 15 _ Capping Cylindrical Concrete enviado por Juliano no curso de Engenharia Civil na UERJ. Buy ASTM C/CM Standard Practice for Capping Cylindrical Concrete Specimens from SAI Global.
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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 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. 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 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.
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 c167 made to determine the effects of aetm ratio and age on compressive strength of 50 m [2 in.
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. In all cases, plates shall be at least 25 m [1 in.
The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. If the asgm starts to burn, covering will snuff out the flame. NOTE 2—A deviation from perpendicularity of 0.
Recharge the pot with fresh material after the flame has been extinguished.
Current edition approved April 1, Some retempering of the paste is acceptable if the required water-cement ratio is not exceeded. 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. The capping plate must not rock during this operation. Metal plates that have been in use shall be free of qstm, grooves, and indentations greater than 0.
NOTE 5—Freshly mixed pastes tend to bleed, shrink, and make asmt caps. Fluid paste results in streaks in the cap. Originally approved in NOTE 8—The water-gypsum cement ratio should be between 0.
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.
During the molding of the cylinder, strike off the upper end even with or slightly below the plane of the rim of the mold. Optimum consistency is generally produced at water-cement ratios of 0. 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.
NOTE 7—Low-strength molding plaster, plaster of paris, or mixtures of plaster of paris and portland cement are unsuitable for capping.
ASTM C / CM – 15 Standard Practice for Capping Cylindrical Concrete Specimens
Use of low water-cement ratios and vigorous c61 will usually permit development of 35 MPa [ psi] at ages of 1 or 2 h. A large metal ladle can be substituted for the rod. Remove free water and laitance from the top of the specimen immediately before capping. C39M – 16 – Compressive Strength of Cylindrical Carefully cover the capping plate and mold with a double layer of damp burlap and a polyethylene sheet to prevent drying.
Using a ladle, or other suitable pouring device, quickly fill each of the three compartments until the molten material reaches the top of the filling hole. See Test Methods C for alternative compaction procedures. For specific precaution statements see 4. When using melting pots not aastm 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.
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. 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.
ASTM Volume After solidification is complete, remove the cubes from the mold without breaking off the knob formed by axtm filling hole in the cover plate.
NOTE 6—The required consistency of the paste is determined by the appearance of the cap when it is stripped. No further reproductions authorized. Retarders may be used to extend working time, but their effects on required water-cement ratio and strength must be determined.
It is the responsibility of the user c6617 this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 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.
Make caps as thin as practicable. Parte 1 de 2 Designation: Combining values from the two systems may result in non-conformance with the standard.
ASTM C617.C617M – 15 – Capping Cylindrical Concrete Specimens
A number in parentheses indicates the year of last reapproval. 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 the formation of a large void or shrinkage pipe in the body of a cube.