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Hollow Core Plank surface roughness requ

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I have always specified a rough float finish and then had the laitance 
sand-blasted off.  A thick slurry of portland cement and water placed on the 
surface before applying the topping also helps.

A. Roger Turk, P.E.(Structural)
Tucson, Arizona

Ghassem wrote:

>>To create better bond between topping and the surface of the hollow core
planks should any specific surface roughness be specified? How do you guys
do it?<<