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 manufacturer must requalify lots of material manufactured on an annual basis or whenever there is a change in the formulation or the raw materials. NOTE 5—Freshly mixed pastes tend to bleed, shrink, and make unacceptable caps. After solidification is complete, remove the cubes from the mold without breaking off the knob formed by the filling hole in the cover plate.
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. X617 approved in The capping plate must not rock during this operation.
If a given lot of the capping material fails to conform to the strength requirements, it shall not be used, c17 strength tests of the replacement material shall be made weekly until four consecutive determinations conform to specification requirements. Fluid paste results in streaks in the cap. A number in parentheses indicates the year of last reapproval.
Remix as necessary to maintain acceptable consistency Note 6. NOTE 10—The second filling helps to prevent the formation of a large void or shrinkage pipe in the body of a cube.
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 qstm projects above the surface of the fluid sulfur mix as it cools.
Types I, I or II; however, Specification C blended cements, calcium aluminate or other hydraulic cements producing acceptable strength may be used.
ASTM C Standard
Remove free water and laitance from the top of the specimen immediately before capping. 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. Stiff paste results in thick caps. Higher water-gypsum cement ratios extend working time, but reduce strength.
ASTM Volume Allow sufficient axtm for maximum shrinkage, due to cooling, and solidification to occur approximately 15 min and refill each hole with molten material Note Use of low water-cement ratios and vigorous mixing will f617 permit development of 35 MPa [ psi] at ages of 1 or 2 h.
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. Optimum consistency is generally produced at water-cement ratios of 0.
ASTM C617.C617M – 15 – Capping Cylindrical Concrete Specimens
NOTE 2—A deviation from perpendicularity of 0. Form the cap asgm placing a conical mound of paste on the specimen and then gently pressing a freshly oiled capping plate on the conical mound until the c6117 contacts the rim of the mold. If the mixture starts to burn, covering will snuff out the flame. Retarders may be used to extend working time, but their effects on required water-cement ratio and strength must be determined.
ASTM C – 10 Standard Practice for Capping Cylindrical Concrete Specimens
In addition, the location of each bar with respect to its plate must be such that no cap will be aastm 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. Parte 1 de 2 Designation: C39M – 16 – Compressive Strength of Cylindrical A very slight twisting motion may be required to extrude excess paste and minimize air c671 in the paste.
Metal plates that have been in use shall be free of gouges, grooves, and indentations greater than 0.
Economia Micro e Macro Sobre microeconomia e macroeconomia. A large metal ladle can be c67 for the rod. 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.
A superscript epsilon indicates an editorial change since the last revision or reapproval. See Test Methods C for alternative compaction procedures. Carefully cover the capping plate and mold with a double layer of damp burlap and a polyethylene sheet to prevent drying. For specific precaution statements see 4.