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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No further reproductions authorized. In all cases, plates shall be at least 25 m [1 in.
During the molding of the cylinder, strike off the upper end even with or slightly ashm the plane of the rim of the mold. After solidification is complete, remove the cubes from the mold without breaking off the knob formed by the filling hole in the cover plate. Metal plates that have been in use shall be free of gouges, grooves, and indentations greater than 0. Fluid paste results in streaks in the cap. The c6177 to 4 h period is generally appropriate for portland cements.
Optimum consistency is generally produced at water-cement ratios of 0.
ASTM C – 10 Standard Practice for Capping Cylindrical Concrete Specimens
Economia Micro e Macro Sobre microeconomia e macroeconomia. For specific precaution statements see 4.
Recharge the pot with fresh material after the flame has been extinguished. Remix as necessary to maintain acceptable consistency Note 6. The rod should be of sufficient size to conduct enough heat to asm top on reheating to melt a ring around the rod first and thus avoid the development of pressure. ASTM Volume Use of low water-cement ratios c671 vigorous mixing will usually permit development of 35 MPa [ psi] at ages of 1 or 2 h. 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 adtm.
The surface, when new, shall be free of gouges, grooves, or indentations beyond those caused by the finishing operation. Stiff paste results in thick caps.
ASTM CCM – 15 – Capping Cylindrical Concrete Specimens
NOTE 10—The second filling helps to prevent the formation c67 a large void or shrinkage pipe in the body of a cube. 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.
NOTE 2—A deviation from perpendicularity of 0.
Cure cubes in the same environment for the same length of time as the x617 used to cap specimens. 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.
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. 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. Allow sufficient time for maximum shrinkage, due to cooling, and solidification satm occur approximately 15 min and refill each hole with molten material Note NOTE 8—The water-gypsum cement ratio should be between 0.
NOTE 5—Freshly mixed pastes tend to bleed, shrink, and make unacceptable caps. 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.
ASTM C617.C617M – 15 – Capping Cylindrical Concrete Specimens
Higher water-gypsum cement ratios extend working time, but reduce c671. If the mixture starts to burn, covering will snuff out the flame. A number in parentheses indicates the year of last reapproval.
Remove free water and laitance from the top of the specimen immediately before capping.