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INSP - Special Inspection Epoxy Anchors -Reply[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc(--nospam--at)seaoc.org
- Subject: INSP - Special Inspection Epoxy Anchors -Reply
- From: Tim McCormick <TMCCORMI(--nospam--at)BAS.CI.LA.CA.US>
- Date: Thu, 15 Jan 1998 15:13:35 -0800
Expansion anchor product approvals list the MINIMUM torque that is necessary to activate the allowable load properties of the anchor. On the contrary, most product approvals for adhesive anchors list the MAXIMUM torque that can be applied. This limit is to ensure that the mechanical bond is not broken between the threads of the all-thread rod and the adhesive. Torque testing of adhesive anchors (epoxy or esters) will only give you some idea if the epoxy bonded to the base material (IE-concrete or masonry). Torque testing for these purposes generally use lower values than for expansion anchors. When desired, specifying a torque for adhesive anchors must fall below the MAXIMUM allowed. >>> Stan Johnson <hawneng(--nospam--at)wac.com> 01/15/98 10:28am >>> Pringle ... Silva ... anybody? For wedge anchors and the like, I have seen special inspection criteria which use torque on the nut to test the anchor. I understand that this is generally justified because in these types of anchors, the ability of the anchor to resist forces is intimately connected to the amount of torque applied during installation. What about torque testing of epoxy anchor systems, Like Hilti's HY150 (we are trying to anchor stuff in Zone 4). Stan Johnson, PE, Sorry I haven't been active on the list lately, but I've been rather busy.
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