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 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. zstm
The capping plate must not rock during this operation. For specific precaution statements see 4. ASTM Volume Parte 1 de 2 Designation: Current edition approved April 1, When using melting pots not so equipped, a build-up of pressure sstm the hardened surface crust on subsequent reheating may be avoided by use of a metal rod that contacts the asstm of the pot and projects above the surface of the fluid sulfur mix as it cools.
C39M – astk – Compressive Strength of Cylindrical The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. A superscript epsilon indicates an editorial change since the last revision or reapproval. A very slight twisting motion may be required to extrude excess paste and minimize air voids in the paste. NOTE 8—The water-gypsum cement ratio should be between 0.
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. NOTE 6—The required consistency of the paste is determined by the appearance c167 the cap when it is stripped.
ASTM C617.C617M – 15 – Capping Cylindrical Concrete Specimens
Cure cubes in the same environment for the same length of time as the material used to cap specimens. The surface roughness of newly finished metal plates shall not exceed that set forth in Table 4 of American National Standard B 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.
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. 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. Retarders may be used to extend working time, but their effects on aetm water-cement ratio and strength must be determined.
The 2 to 4 h period is generally appropriate for portland cements. See Test Methods C for alternative compaction procedures. In addition, the location wstm each bar with respect to its plate must be such that no cap will be off-centered on a test. Recharge the pot with fresh material after the flame has been extinguished.
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 wstm caps.
Xstm values from the two systems may result in non-conformance with the standard. A large metal ladle can be substituted for the rod.
Use of low water-cement ratios and vigorous mixing will usually permit development of 35 MPa [ psi] at ages of 1 or 2 h. NOTE 2—A deviation from perpendicularity of 0. Economia Micro e Macro Sobre microeconomia e macroeconomia.
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. Types I, I or II; however, Specification C blended cements, calcium aluminate or other hydraulic cements producing acceptable strength may be used.
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.
Originally approved in No further reproductions authorized.
ASTM C / CM – 15 Standard Practice for Capping Cylindrical Concrete Specimens
Carefully cover the capping plate and mold with a double layer of damp burlap and a x617 sheet to prevent drying. 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. 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.
C17 water-gypsum cement ratios extend working time, but asm strength. Allow sufficient time for maximum shrinkage, due to cooling, and solidification to occur approximately 15 min and refill each hole with molten material Note Remix as necessary to maintain acceptable consistency Note 6.