The work covered by this division of the specifications consists
of furnishing all labor, materials and equipment to perform all operations in
connection with the complete installation of the pressure injected epoxy as
shown on the Drawings and/or as specified herein.
A. The top surface of the cracks designated for injection shall be cleaned
free of dust, silt, laitance, oil and grease, or any other material that would
interfere with the bond of the surface sealer.
B. Entry ports for epoxy shall be provided, spaced far enough apart to assure
that when the adhesive material shows at the adjacent port, it has completely
filled the crack to it's full depth. Entry ports shall be spaced along cracks
and spacing usually determined by the tightness of the crack and the depth of
the concrete substrate. Spacing is generally between 6 and 14 inches.
C. Surface ports are the preferred method for most injection as it prevents
the crack from being contaminated when being drilled.. If drilled Injection ports
are needed they shall be drilled with a hollowed core drill bit with a vacuum in
a way that will not contaminate the inside of the crack. Drill ports shall be inserted into the drilled holes to about 1/2 inch
allowing for the small reservoir below the port.
D. The ports are then sealed
into position with Epoxy Bonding Paste
Epoxy Bonding
Paste Product #2006 for wet or dry
applications, or Epoxy.com Product #48 (Filler 7), for dry applications.
Care will be taken not to seal the ports from resin flow. If surface port system
is used, care will be taken to insure that the crack is open at the point below
the port, and that there is a proper reservoir beneath the port.
E. A surface seal or epoxy patch meeting the requirements of this
specification shall first be applied to the exterior crack to prevent the escape
of the injection resin. The cracks shall be covered with a bead of
Epoxy Bonding
Paste Product #2006 and smoothed with a putty knife to insure sealing.
F. Injection of the epoxy resin into a crack shall, unless permitted by the
Engineer, begin first at the entry port of lowest elevation and continue until
uncontaminated epoxy flows out of the adjacent port. Injection pressure shall be
kept as low as practical and shall generally be between 20 psi and 30 psi
plus any hydrostatic head. The connection between the entry port and the mix
head of the injection nozzle must be sufficiently tight to prevent epoxy from
running out on the concrete surfaces.
G. After injection at a given port is complete, this port shall be plugged
and injection started at the next adjacent port. This procedure shall be
repeated until the crack is completely filled. Upon completion surface to be
left as noted on the Drawings.
It is expected that the contractor will furnish adequate labor, material
and equipment such that the work will progress with out any undue and
unnecessary interruption.