Patent ID: 7937901
Filing Date: 2011-05-10
Classification: E01D,E04B,E04C,E04G

Abstract:
1. A method of providing visual identification of the location within an elevated concrete slab of a plurality of uniform individual, parallel, spaced-apart, elongated post-tensioning tendons extending in a first direction between opposing peripheral side edges of said concrete slab and at least one elongated banded post-tensioning tendon extending in a second direction approximately perpendicular to said uniform tendons, said plurality of uniform tendons and at least one banded tendon embedded within the interior of said elevated concrete slab approximately with the same plane, the method comprising: a) providing said concrete slab with a uniform level top surface; b) providing the bottom side surface of said concrete slab with visibly distinct first and second bottom side surface patterns arranged with said first surface pattern having a first uniform full slab thickness underlying and extending along each of said uniform post-tensioning tendons and each of said at least one banded post-tensioning tendons, and with said second surface pattern having a second uniform partial slab thickness in the range of 60% to 90% of said first full slab thickness, said second surface pattern underlying spaces between each of said uniform post-tensioning tendons and each of said at least one banded post-tensioning tendons, and c) designating said first and second bottom side surface patterns as identifying, respectively, the location of and absence of embedded post-tensioning tendons extending within the interior of the slab.