United States Department of Transportation
i
Development of Non-Proprietary Ultra-High-Performance Concrete and Railway Tie Application
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2024-05-01
[PDF-5.47 MB]
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Edition:Final Report
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Abstract:This study reports on properties of non-proprietary ultra-high-performance concretes (UHPCs) for railway ties. The research work is divided into three major phases. The first phase reports on optimization of cementitious materials and aggregates and selection of the most suitable water-to-cementitious materials ratio. In the second phase, the transport and durability properties of the optimized UHPCs are determined. In the third phase of the study, assessment on the structural behavior of the full-scale UHPC railway ties is reported. The major variables of this study are binder types (Type V cement, class F fly ash, silica fume, Ground granulated blast-furnace slag, natural pozzolan), binder combinations (binary, ternary, quaternary), aggregate-to-cementitious materials ratio (0.80, 1.00, and 1.20), steel fiber types (hooked and straight), and steel fiber content (0%, 2%, and 3%). The experimental program assesses the fresh properties (flow), demolded unit weight, mechanical properties (compressive, tensile, and flexural strengths, and modulus of elasticity), transport properties (water absorption, volume of permeable void, water penetration, rapid chloride penetration, and surface resistivity), durability (freezing and thawing resistance, deicing salt resistance, and abrasion resistance), and dimensional stability (drying shrinkage). The structural performance of non-proprietary UHPC ties is examined under static center negative moment test, static rail-seat moment test, and center negative cyclic loading conditions.
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