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. After solidification is complete, remove the cubes from the mold without breaking off the knob formed by the filling hole in the cover plate. Types I, I or II; however, Specification C blended cements, calcium aluminate or other hydraulic cements producing acceptable strength may be used.
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NOTE 2—A deviation from perpendicularity of 0. Fluid paste results in streaks in the cap. A superscript epsilon astj an editorial change since the last revision or reapproval. After solidification is complete, remove the cubes from the mold without breaking off the knob formed by the filling hole in the cover plate.
ASTM Zstm The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Allow sufficient time for c167 shrinkage, due to cooling, and solidification to occur approximately 15 min and refill each hole with molten material Note Remove free water and laitance from the top of the specimen immediately before capping.
Combining values from the two systems may result in non-conformance with the standard.
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. Remix as necessary to maintain acceptable consistency Note 6.
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. NOTE 6—The required consistency of the paste is determined by the appearance of c17 cap when it is stripped.
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. The 2 to 4 h period is generally appropriate for portland cements.
ASTM C - 10 Standard Practice for Capping Cylindrical Concrete Specimens
The surface roughness of newly finished metal plates shall not exceed that set forth in Table 4 of American National Standard B If a given lot of the capping material fails to conform to the strength requirements, it shall not be used, and strength tests asstm the replacement material shall be made weekly until four consecutive determinations conform to specification requirements. During the molding of the cylinder, strike off the upper end even with or slightly below the plane of the rim of the mold.
Higher water-gypsum cement ratios extend working time, but reduce strength. Current edition approved April 1, Use of low water-cement ratios and vigorous mixing will usually permit development of 35 MPa [ psi] at ages of 1 or 2 h.
ASTM C, Test equipment Controls
The capping plate must not rock during this operation. NOTE 5—Freshly mixed pastes tend to bleed, shrink, and make unacceptable caps. 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 large metal ladle can be substituted for the rod. Originally approved in See Test Methods C for alternative compaction c67. 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.
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. Make caps as thin as practicable. Carefully cover the capping plate and mold with a double layer of damp burlap and a polyethylene sheet to prevent drying.
Optimum consistency is generally produced at water-cement ratios c6617 0. C39M - 16 - Compressive Strength of Cylindrical Recharge the pot with fresh material after the flame has been extinguished.
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