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Tunnel Manhole Design, contd.<br />
• Design process<br />
• Considered liners and coatings for cast-in-place concrete<br />
• Installation conditions critical and needs strong construction QC<br />
• Investigated polymer concrete<br />
• Uses resin binder in place of Portland cement<br />
• Corrosion resistant across whole cross-section<br />
• Was not available in 16’ ID sections at time of design<br />
• Selected cast-in-place concrete with PVC liner
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