C39M - 16 - Compressive Strength of Cylindrical NOTE 10—The second filling helps to prevent the formation of a large void or shrinkage pipe in the body of a cube. 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 values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.
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ASTM C617.C617M - 15 - Capping Cylindrical Concrete Specimens
Originally approved in ASTM Volume No further reproductions authorized. 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. If the mixture starts to burn, covering will snuff out the flame. A number in parentheses indicates the year of last reapproval.
NOTE 5—Freshly mixed pastes tend to bleed, shrink, and make unacceptable caps.
Make caps as thin as practicable. NOTE ast molding plaster, plaster of paris, or mixtures of plaster of paris and portland cement are unsuitable for capping.
Some retempering of the paste is acceptable if the required water-cement ratio is not exceeded. Retarders may be used to extend working time, but their effects on required water-cement ratio and strength must be determined.
ASTM C, Test equipment Controls
C39M - 16 - Compressive Strength of Cylindrical 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. Remove free water and laitance from the top of the specimen immediately ast, capping. See Test Methods C for alternative compaction procedures. Current edition approved April 1, Types I, I or II; however, Specification C blended cements, calcium aluminate or other hydraulic cements producing acceptable strength may be used.
The 2 to 4 h period is generally appropriate for portland cements. For concrete strengths of 35 MPa [ psi] or greater, sulfur mortar caps must be allowed to harden at least 16 h before testing, unless astn shorter time has been shown to be suitable as specified in 5.
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. The capping plate must not rock during this operation.
In all cases, plates shall be at least 25 m [1 in. Optimum consistency is generally produced at water-cement ratios of 0.
ASTM C Standard
A large metal ladle can be substituted for the rod. 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. A superscript epsilon indicates an editorial change since the last revision or reapproval. Parte 1 de 2 Designation: Metal plates that have been in use shall be free of gouges, grooves, and indentations greater than 0.
Use of low water-cement ratios and vigorous mixing will usually permit development of 35 MPa [ psi] at ages of 1 or 2 h. A very slight twisting motion may be required to extrude excess paste and minimize air voids in the paste.
The user xstm 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.
If a given lot of the capping material fails to conform to the strength requirements, it shall not be used, and strength tests of the replacement material shall be made weekly until four consecutive determinations conform to specification requirements. Carefully cover the capping plate and mold with a double layer of damp burlap and a polyethylene sheet to prevent drying. Remix as necessary to maintain acceptable consistency Note 6.
After solidification is complete, remove the cubes from the mold without breaking off the knob formed by the filling hole in the cover plate. However, such defects may occur no matter how much care is exercised, and it therefore is x617 to inspect the interior of tested sulfur mortar cubes for homogeneity whenever the strength values obtained are significantly lower than anticipated.
Allow sufficient time for maximum shrinkage, due to cooling, and solidification to occur approximately 15 min and refill each hole with molten material Note