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6. MATERIAL BOND TESTER KIT
Procedure for preparing samples for pull-off testing:
1. Clean the steel dollies (degrease and grit blast unless
otherwise stated). This will help to prevent interfacial
failures at the dolly interface.
2. For concrete substrates drill through the repair system
with diamond core drill at (90±)º to the surface into the
test surface by ~5mm or more.
This ensures a consistent bond area and will therefore
help reduce variations in the test results.
3. Clean the substrate test surface as recommended by
the manufacturer.
4. Mix the adhesive as recommended by the adhesive
supplier and add 1% by weight of ballotini (usually
0.5mm unless stated otherwise).
Adding ballotini will reduce alignment errors and
therefore help reduce variations in the test results.
5. Apply adhesive to steel dolly.
• 2000 model Medium Duty Tester with
xedGaugeto25kN*
• Bond test stool with adjustable legs
• 10x50mm & 10x 75mm steel bond
discs
• Bond test plug
•CalibrationCerticate
• Padded Carrying Case
(Can accommodate 20x50 & 20x75 discs)
ON SITE PULL
-
OFF METHOD
Equipment that may be required in
addition to the standard kit contents:
• Adhesive • Spatula
• Bondline spacers -
i.e.ballotini (glass spheres)
• Diamond-coated core drill
The bonding strengths of a wide and
varied range of materials including
concrete, screeds, repair mortars, epoxy
resin coatings, laminates, plastics,
paints and enamels may be accurately
determined using the Hydrajaws Material
Bond Tester.
Adequate direct tensile strength or
bonding strength between two layers is
important if repairs to concrete structures
or additional overlays and screeding on
existing concrete is to be structurally
sound.
The pull-off test as a means of projecting
the compressive strength of concrete
and other materials involves bonding
a circular steel disc to the surface by
means of an epoxy resin adhesive.
KIT CONTENTS:
A controlled tensile force is then applied to the disc, and as the strength of the bond is
greater than that of the material under stress it will eventually fail in tension. From the
area of the disc and the force applied at failure it is possible to calculate a nominal tensile
strength for the material.
DOLLY
TEST SURFACE
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