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原文传递 MSE Wall Void Repair Effect on Corrosion of Reinforcement – Phase 2: Specialty Fill Materials.

题名：	MSE Wall Void Repair Effect on Corrosion of Reinforcement – Phase 2: Specialty Fill Materials.
作者：	Paz, E. A.; Sagues, A. A.
关键词：	Mechanically stabilized earth, Cement-based, Polyurethane foam, Fill materials, Soils, Voids, Corrosion, Macrocell, Durability, Galvanized, Reinforcement, Recommendatioins, Performance, Cement-Based Controlled Low-Strength Material (CLSM)
摘要：	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.
总页数：	Paz, E. A.; Sagues, A. A.
报告类型：	科技报告