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Subject: Adhesive for sensors in masonry walls

Adhesive for sensors in masonry walls

From: Judy Jacob <Judy_Jacob>
Date: Thursday, August 6, 1998
The following is posted on behalf of David Bittermann

    I am looking for an epoxy (or modified epoxy, or other similar
    resin) to set moisture sensors in thick masonry walls.  Two
    moisture sensors are to be installed in tandem at various depths
    within a single 1-1/4" diameter horizontal bore, such that they
    sense the temperature and humidity conditions of respective
    isolated air chambers to be formed within the bore.  Two epoxy
    plugs will be installed in the bore.  The first will be placed
    in a zone between the deep sensor and the shallow sensor, and
    the second outboard of the shallow sensor.

    The required characteristics are:

        1.  Ability to place by an injection tool (hand operated
            plunger gun) to plug a 1-1/4" bore from a depth of 24"
            to a depth of 13", without leaving residue on any
            intermediate surfaces.

        2.  Ability to adhere to potentially damp masonry without
            the use of a primer.

        3.  Ability to bond to masonry sufficiently to prevent
            moisture or vapor from traveling along the length of the
            plug at the interface with the masonry.

        4.  Viscosity low enough to inject, but high enough to
            retain a vertical face in the 1-1/4" bore without
            slumping prior to cure.

        5.  Low compressive strength, low hardness, moderate

        6.  Ability to substantially remove by re-drilling the bore,
            so that sensors can be withdrawn and replaced through
            removed plug.

        7.  Ability for reinstalled plug material to adhere to cured
            remaining residue of previously removed plug.

        8.  Material must be readily available in non-bulk

        David Bittermann
        National Park Service
        400 Foot of John Street
        Lowell, MA 01852
        david_bittermann [at] nps__gov

                  Conservation DistList Instance 12:16
                 Distributed: Thursday, August 6, 1998
                       Message Id: cdl-12-16-010
Received on Thursday, 6 August, 1998

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