| Thick, black tar is used for damp-proofing the back of the newly-poured concrete backwalls. It is applied ahead of the 'lifts' of backfill used to bring the roadbed back to grade after completion of the backwalls. Lifts are one-foot deep dumps of backfill material, compacted using a mechanical compactor ahead of the next lift (marked by the orange lines on the backwall). |
| Date:
2/28/2008 |
Location:
Plainfield, NJ Map  |
Views:
245 |
Collection Of:
 
Dave Abeles |
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Author: David Abeles
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This picture is part of album: So, you want to replace a railroad bridge... |