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原文传递 Rehabilitation of Deteriorated Wood Railroad Ties Using Inorganic Polymers: Final Report on Project F17 AR03.

题名：	Rehabilitation of Deteriorated Wood Railroad Ties Using Inorganic Polymers: Final Report on Project F17 AR03.
作者：	Al-Chaar, G. K.; Sankar, K.; Kriven, W. M.
关键词：	Railroad ties, Maintenance, Repair, Cement, Material degradation processes, Field tests, Corrosion inhibition, Compressive strength, Fly ash, Inorganic polymers, Cement composites, Slag
摘要：	The U.S. Army owns and maintains about 1,900 miles of railroad track configured as short lines for mission-required on military installations where ordnance and other heavy freight must be moved in quantity onsite, or to connect with the national railroad network for long-distance transport. Almost all of crossties used in these rail lines are made of creosote-treated wood to support the rails. Wood offers several advantages in terms of life-cycle costs and structural suitability. Chemical treatment of wood ties extends their life cycles, but service life is still finite due to rot, consumption by insects, and other stressors. The removal and replacement of failed wood ties is costly, time-consuming, and disruptive to rail operations. Furthermore, the residual preservative chemicals also create a costly disposal problem. This report describes the development of a cementitious geopolymer material based on slag-fly ash binder mixtures formulated with properties making it suitable for use as a tough, affordable in situ tie-rehabilitation material. Two candidate formulations were validated in lab experiments as easy to prepare onsite, and demonstrating excellent flowability with good compressive and flexural strength. Field demonstrations are still required to validate rehabilitation procedures and performance characteristics in Army rail line operations.
报告类型：	科技报告