Long-Term Performance of Polymer Concrete for Bridge Decks (2012) / Chapter Skim
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Pages 34-40
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From page 34... ...
Resins are too expensive to be used on excessively rough or deteriorated concrete surfaces. OVERLAY TYPES The types and recommended uses for each are as follows: Multiple-Layer Overlays Multiple-layer overlays are best used on decks that have good ride quality because the overlays follow the contours of the deck surface (15)
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These properties include high bond strength to concrete substrates and the embedded TPO aggregates, high tensile elongation, and a very low modulus of elasticity (compared with the concrete substrate) to offset the higher coefficients of thermal expansion.
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34.4 (5,000 psi) ASTM C579 PC Tensile Bond Strength, MPa @ 24 h Min.
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The surface is to be shot blasted the day of the placement, preferably just before overlay placement. A reasonable texture can be achieved by meeting the ICRI CSP 7 profile.
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From page 38... ...
Figure 16 shows the setup for the tensile bond strength on a test patch of the installed overlay. For tensile bond strength of 1.7 MPa (250 psi)
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From page 39... ...
A primer is usually applied to the surface at a rate of 0.41 ± 0.14 kg/m2 (0.8 ± 0.3 lb/yd2) to improve the bond strength.
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From page 40... ...
38 2007 TPO specification.
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