Seismic Design of Geosynthetic-Reinforced Soil Bridge Abutments with Modular Block Facing (2012) / Chapter Skim
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Pages 243-250
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From page 243... ...
CHAPTER 8 CONSTRUCTION GUIDELINES RECOMMENDED CONSTRUCTION GUIDELINES Earthwork construction control for Geosynthetic-Reinforced Soil (GRS) abutments under seismic loading is essentially the same as that required under static loading (as presented in NCHRP Report 556, Wu, et al., 2006)
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240 approximately 150 mm thick and 450 mm wide. Compaction of the leveling pad should be performed using a light-compactor to obtain a minimum of 95% of the maximum standard Proctor density (AASHTO T-99)
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241 - It is a good practice to place a compressible layer (e.g., a low to medium density expanded polystyrene sheet) , of approximately 50 mm in thickness, between the wrapped face reinforcement and the rigid abutment upper wall.
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242 three to five passes with conventional vibratory roller compaction equipment may be adequate. The actual requirements should be determined based on field trials.
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243 manufactured with a coating or additive to increase freeze-thaw resistance. - Facing blocks shall be placed and supported as necessary to that their final position is vertical or battered as shown on the plans or the approved working drawings with a tolerance acceptable to the engineer.
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From page 248... ...
244 fill. - Geotextile reinforcement typically provides inherent drainage function; subsurface drainage at wall face is generally not needed.
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245 Timber Facing: • The timber typically has a 150 mm x 200 mm or 150 mm x 150 mm cross-sectional dimension and shall be treated to an acceptable level with copper chromate or approved equivalent preservative. The bottom row of timber shall be treated for direct burial.
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From page 250... ...
246 Figure 8.1 Details of reinforcement layout near the top of the load-bearing wall
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