ASTM C617 PDF
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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Make caps as thin as practicable. Metal plates that have been in use shall be free of gouges, grooves, and indentations astk than 0. Economia Micro e Macro Sobre microeconomia e macroeconomia. Carefully cover the capping plate and mold with a double layer of damp burlap and a polyethylene sheet to prevent drying. Optimum consistency is generally produced at water-cement ratios of 0. Higher water-gypsum cement ratios extend working time, but reduce strength.
During the molding of the cylinder, strike off the upper end even with or slightly below the plane of the rim of the mold. The 2 to v617 h period is generally appropriate for portland cements. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.
The capping plate must not rock during this operation. A large metal ladle can be substituted for the rod. A superscript epsilon indicates an editorial change since the c61 revision or reapproval.
NOTE 7—Low-strength molding plaster, plaster of paris, or mixtures of plaster of paris and portland cement are unsuitable for capping. 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.
ASTM C617.C617M – 15 – Capping Cylindrical Concrete Specimens
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. Use of low water-cement ratios and vigorous mixing will usually permit development of 35 MPa [ psi] at ages of 1 or 2 h. 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.
No further reproductions authorized.
Stiff paste results in thick caps. 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. Remove c67 water and laitance from the top of the specimen immediately before capping. Originally approved in 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.
For specific precaution statements see 4. ASTM Volume NOTE 8—The water-gypsum cement ratio should be between 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 5.
6c17 The surface roughness of newly finished metal plates shall not exceed that set forth in Table 4 of American National Standard B Fluid paste results in streaks in the cap.
After solidification is complete, remove the cubes from the mold without breaking off the knob formed by the filling hole in the cover plate.
Retarders may be used to extend working time, but their effects on astk water-cement ratio and strength must be determined. A very slight twisting motion may be required to extrude excess paste and minimize air voids in the paste. NOTE 2—A deviation from perpendicularity of 0. A number in parentheses indicates the year of last reapproval. See Test Methods C for alternative compaction procedures.
The surface, when new, shall be free of gouges, grooves, or indentations beyond those caused by the finishing operation. 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. Combining values from the two systems may result qstm non-conformance with the standard.
Cure cubes in the same environment for the same length of time as the material used c6617 cap specimens.
ASTM C / CM – 15 Standard Practice for Capping Cylindrical Concrete Specimens
Allow sufficient time for maximum shrinkage, due to cooling, and solidification to occur approximately 15 min and refill each hole with molten material Note 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. Some retempering of the paste is acceptable if the required water-cement ratio is not exceeded. In all cases, plates shall be at least asym m [1 in.
Wstm 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.
NOTE 6—The required consistency of the paste is determined by the appearance of the cap when it is stripped. Parte 1 de 2 Designation: NOTE 10—The second filling helps to prevent the formation of a large void or shrinkage pipe in the body of a cube.
NOTE 5—Freshly mixed pastes tend to bleed, shrink, and make unacceptable caps. C39M – 16 – Compressive Strength of Cylindrical If the mixture starts to burn, covering will snuff out the flame.