1. Rationale
Revise Section 5.1, 5.2 & 7.4 Currently, this practice requires certain pieces of equipment to be plane to 0.003 in 16 inches, and also requires the surfaces of the capped specimen to meet the same requirement. Currently, a 16 inch straightedge is not commercially available. Anecdotal historical evidence suggests that the 16 inch length was assumed as a standard length of a commercially available straight edge, which would be easily obtainable for verification of the equipment and surfaces of the capped specimen. However, commercially available straight edges come only in 6, 12 & 18 inch sizes. The lack of availability makes attempts to verify planeness requirements of the equipment and capped specimens difficult for the user to perform. In addition, current language does not guide the user when faced with capping a specimen that is smaller than the 16 inch length. The intent of the proposed ballot is to change the length requirement to a size that will allow the use of a commercially available standard straight edge, while still maintaining an essentially equivalent tolerance; and provide guidance when capping smaller sized specimens.
Keywords
cap; capping; capping materials; capping plate; casting plate; compressive strength; gypsum cement; sulfur; Capping concrete materials/applications; Casting plate; Compression testing--cement/concrete; Gypsum cement; Masonry prisms; Masonry units;
Citing ASTM Standards
[Back to Top]
