Field and laboratory investigations for Full Depth Reclamation projects Page: 51
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widening the existing base. Next, the existing material should be recycled with
3 percent cement to a depth of 8 in. and spread to extend the width of each half-section by
3 ft. If no additional thickness is required for the traffic loadings, the FDR layer can then be
sealed. If additional thickness is needed, or for added protection against the risk of longitudinal
cracking, a flexible base overlay can be employed with geogrid reinforcement at areas with
subgrade plasticity index values exceeding 35. Figure 5.9 shows the proposed sequence.
As traveling westbound, two long sections exist with substantial amounts of deep patching.
These are at the following distances from the county line:
* 2530 ft to 1 mile + 1590 ft, and
* 5 miles to 6 miles + 135 ft.
In these sections, other options are needed to avoid recycling 100 percent RAP. The best
approach would be:
* mill and remove 4 in.
* mill an additional 4 in.
* add 4 in. of new flexible base, and
* cement treat 8 in. with 3 percent cement and spread to the new pavement width.SOriginal Pavement
O Subgrade Widening4" Bituminous Surfacing
2" Flex Base
2" Buried Bituminous Layer
" Flex Base
*yr i r L~wa "-rL SubgradeFigure 5.9. Proposed Sequence for FM 969.
51
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Sebesta, Stephen; Scullion, Thomas & Estakhri, Cindy K. Field and laboratory investigations for Full Depth Reclamation projects, report, March 2011; College Station, Texas. (https://texashistory.unt.edu/ark:/67531/metapth303679/m1/65/?q=%222008~%22: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.