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 capping plate must not rock during this operation. Types I, I or II; however, Specification C blended cements, calcium aluminate or other hydraulic cements producing acceptable strength may be used. Carefully cover the capping plate and mold with a double layer of damp burlap and a polyethylene sheet to prevent drying. ASTM Volume Economia Micro e Macro Sobre microeconomia e macroeconomia.
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. C39M – 16 – Compressive Strength of Cylindrical After solidification is complete, remove the cubes from the mold without breaking off the knob formed by the filling hole in aatm cover plate.
NOTE 10—The second filling helps to prevent the formation of a large void or shrinkage pipe in the body of a cube.
Remove free asmt and laitance from the top of the specimen immediately before capping. Higher water-gypsum cement ratios extend working time, but reduce strength. A superscript epsilon indicates an editorial change since the last revision or reapproval. Optimum consistency is generally produced at water-cement ratios of 0.
A number in parentheses indicates the year of last reapproval.
ASTM C617.C617M – 15 – Capping Cylindrical Concrete Specimens
The 2 to 4 h period is generally appropriate for portland cements. 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. Remix as necessary to maintain acceptable consistency Note 6. 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.
Allow sufficient time for maximum shrinkage, due to cooling, and solidification to occur approximately 15 min and refill each hole with molten material Note 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.
See Test Methods C for alternative compaction procedures. 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.
In all cases, plates shall be at least 25 m [1 in. 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. During the molding of the cylinder, strike off the upper end even with or slightly below the plane of the rim of the mold.
Recharge the pot with fresh material after the flame has been extinguished. 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. Use of low water-cement ratios and vigorous mixing will usually permit development of 35 MPa [ psi] at ages of 1 or 2 h. 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.
If the mixture starts to burn, covering will snuff out the flame. Parte 1 de 2 Designation: NOTE 7—Low-strength molding plaster, plaster of paris, or mixtures of plaster of paris and portland cement are unsuitable for capping. NOTE 5—Freshly mixed pastes tend to bleed, shrink, and make unacceptable caps. NOTE 8—The water-gypsum cement ratio should be between 0.
Metal plates that have been in use shall be free of gouges, grooves, and indentations greater than 0.
ASTM CCM – 15 – Capping Cylindrical Concrete Specimens
Originally approved in For specific precaution statements see 4. NOTE 2—A deviation from perpendicularity of 0. Stiff paste results in thick caps.