MSE wall void repair effect on corrosion of reinforcement - phase 2 : specialty fill materials.
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2015-08-01
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Abstract:This project provided information and recommendations for material selection for best
corrosion control of reinforcement in mechanically stabilized earth (MSE) walls with void repairs. The
investigation consisted of small- and large-scale experiments and modeling to examine corrosion
aggravation effects and conduct durability projections. Regular cement-based controlled low-strength
material (CLSM) was tested, along with slag-based CLSM, MgO-based CLSM, and polyurethane foam
filler. Laboratory experiments indicated that macrocell coupling could substantially increase the corrosion
of the galvanized coating in the backfill side of a void repair with CLSM based on cement or on slag. The
modestly lower pH of the latter did not appear to be a sufficiently beneficial factor in lowering the extent
of adverse macrocell action. CLSM based on MgO, although having a pH closer to neutral, still resulted
in significant adverse macrocell corrosion development. Experiments with the polyurethane foam void
fill confirmed the expectation of much lower tendency for macrocell aggravation of corrosion in the backfill
side. Performance modeling projections quantified the amount of corrosion-related MSE wall
degradation that may be expected as the structure ages. It is recommended that the performance model
projections be analyzed via structural considerations for choice of representative limit state to establish
to what extent a transition to an alternative void filler material is desirable. The use of polyurethane foam
is recommended for further consideration, with additional evaluation of corrosion performance of
reinforcement in that medium.
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