1. Rationale
Proposed change to ASTM E 1190 Section 5.1.2 of ASTM E1190 covers shear testing. Section 5.1.2.2 covers the shear fixture used in the test. The language in this section is very restrictive, and could use a bit of a tweak. When testing Power-Actuated Fasteners in shear, the typical procedure utilized is to fire the fastener through a disposable medium in order to drive the fastener to the proper penetration depth. The disposable medium is then removed or cut away, leaving a small gap between the head of the fastener and the base material. The shear fixture used to test this fastener is slotted, where the width of the slot in the fixture matches the diameter of the hole currently detailed in Section 5.1.2.2 of ASTM E1190 The hole in the shear fixture designed to accommodate the fastener shall have a diameter that is 0.5 0.1 mm (0.020 0.004 in.) greater than that of the fastener tested. This method of testing is much safer (the lab technician is not firing a fastener through a pre-drilled hole in a steel shear fixture), and it permits the test program to be completed at a quicker rate (the lab technician can make multiple fastenings, then come back and perform multiple shear tests). If one follows the current language and has only one shear fixture, the process is quite slow. Therefore, what is proposed is that we modify the language in Section 5.1.2.2 of ASTM E1190 to permit the use of a slotted fixture. The width of the slot would have to match the current language for the diameter of the hole that is required now. The initial shape of the end of the slot would have match the current language for the initial shape of the hole that is now required.
Keywords
concrete; drive pin; edge distance; failure modes; fastener; masonry; powder-actuated; power-actuated; shear test; spacing; structural member; tension test; threaded stud;
Citing ASTM Standards
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