Field Evaluation and Durability Analysis of an Eco-Friendly Prestressed Concrete Sleeper

Koh, Taehoon; Hwang, Seonkeun

doi:10.1061/(asce)mt.1943-5533.0001109

Cited by 19 publications

(8 citation statements)

References 8 publications

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“…The transfer length of the eco-friendly concrete sleepers was not only shorter than that of the conventional concrete sleepers but shorter than the length measured from the edge of the sleeper to the beginning of the railseat section, which indicated that the effective stress was fully developed in the railseat section [17]. The eco-friendly concrete not only reduced the CO 2 emission by replacing 30% of cement but also exhibited superior mechanical performance, which was attributed to stable and dense microstructures and improved workability (ball bearing effect) by using the EAF oxidizing slag and improved durability by using the GGBF slag [18] in addition to the higher 28-day minimum compressive strength.…”

Section: Introductionmentioning

confidence: 96%

Field Tests on Eco-Friendly Railway Precast Concrete Slab

Koh

Shin

2020

Applied Sciences

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This study focuses on evaluating the field performance of a newly developed eco-friendly precast concrete slab track structure for railway/subway systems in Seoul, South Korea. Although Ballasted railway track structures are one of the most common track structures in the railway industry, they have some drawbacks including higher maintenance cost, un-uniform supports, and a high level of noise and vibration. However, a ballastless (slab-based) track structure system requires less maintenance and uniform support conditions, as well as several ballastless structure systems developed for high-speed trains. The Seoul Metro subway in South Korea has developed a ballastless reinforced concrete (RC) slab railway system using a type of conventional concrete. This study presents a ballastless precast concrete slab using a newly developed eco-friendly concrete, which can significantly improve structural performances and the manufacturability of a railway track structure system. This study evaluates the field performance of the eco-friendly concrete slab system deployed in one of the existing tunnel sections of the Seoul Metro subway system. A total of 10 m long slab sections including a 5 m long eco-friendly “ballasted track to slab track (B2S)” panels section and a 5 m long conventional B2S panels section are installed and monitored side by side. Field tests are performed to measure the level of noise, vibration, dynamic wheel load, rail displacement, and rail stress. The field measurements from the eco-friendly B2S section are compared to those of the conventional reinforced concrete slab track systems. The results show that the performance of the new B2S system using the eco-friendly concrete is comparable and/or superior to the conventional system.

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Section: Introductionmentioning

confidence: 96%

Field Tests on Eco-Friendly Railway Precast Concrete Slab

Koh

Shin

2020

Applied Sciences

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“…Other principal concerns have been the durability properties and their service life [38,40,41]. However, very few studies have considered the production of environmentally sustainable sleepers [31,[42][43][44][45]. These eco-friendly prestressed concrete sleepers have been developed by partially replacing Portland cement for ground granulated blast furnace slag and replacing natural fine aggregate by electric arc furnace oxidizing slag.…”

Section: Introductionmentioning

confidence: 99%

Structural behaviour of prestressed concrete sleepers produced with high performance recycled aggregate concrete

2016

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The final publication is available at Springer via http://dx.doi.org/10.1617/s11527-016-0966-6A comparative analysis of the structural behaviour of prestressed concrete sleepers made with high performance concrete (HPC) and high performance recycled aggregate concrete (HPRAC) is presented in this study. Two types of HPRAC sleepers were tested, using 50 and 100% of recycled concrete aggregate (RCA) in replacement of coarse natural aggregates. The RCA employed in this research was sourced from crushing rejected HPC sleepers. The aim of this study was to determine through analysis if the HPRAC sleepers’ behaviour fulfilled the European minimum requirements standards for prestressed concrete sleepers and compare their experimental behaviour with that of the HPC sleepers. The three types of prestressed concrete sleepers were subjected to static load tests at rail-seat and centre section (positive and negative load). In the centre section tests a comparative study between the experimental results and the proposed values of four assessment methods of ultimate capacity was carried out. Dynamic load and fatigue tests were also performed at the rail-seat section. The HPRACs and HPC sleepers met all the structural requirements for prestressed concrete sleepers. The experimental results determined the satisfactory performance of the HPRAC-50 and the HPRAC-100, which was very similar to that of the HPC sleepers. The load–strain behaviour recorded via the use of strain gauges on the prestressing bars revealed slightly higher stiffness of the HPC sleepers. The values obtained from the four assessment methods of ultimate capacity were also accurate when applied to HPRAC.Peer ReviewedPostprint (author's final draft

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“…For the currently used natural ballast, there are three problematic issues: (1) it is continuously exposed to abrasion and crush due to running train loading; (2) crushed or fragmented particles clogging the voids of the roadbed cause some problems with respect to the function of roadbed drainage systems; (3) both Multiple Tie Tamper (MTT) track maintenance works for track deformation and ballast cleaning lead to accelerating sudden settlements of the ballast layer. Thus, it is necessary to develop the eco-friendly and geo-engineered alternative ballast materials to provide improvement in stability during the ballasted track maintenance.…”

Section: Introductionmentioning

confidence: 99%

“…The National Slag Association (NSA) explained that steel industry slag could be excellent ballast material in several aspects: (1) higher durability than the quality standards, (2) cost effectiveness of sustainability and maintenance, and (3) minimum occurrence of mud pumping. Steel slag was applied to ballast materials for railways in the western region adjoining the California-Nevada border in United States [5].…”

Section: Introductionmentioning

confidence: 99%

“…Namely, BF iron slag (air cooled BF slag and granulated BF slag) has long been utilized as a construction material (aggregate and concrete binder etc. ), and steel slag (BOF slag and EAF oxidizing slag) has been the subject of numerous research efforts with the aim of used as aggregates for road, embankment, reinforced concrete elements, or high-performance concrete with good bond with reinforcements, eco-friendly prestressed concrete sleeper [1][2][3][4]. However, steel slag still has not been widely utilized as aggregate for concrete production limited by Construction Specification, due to its unqualified properties with the specification.…”

Section: Introductionmentioning

confidence: 99%

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A Feasibility Study on the Application of Basic Oxygen Furnace (BOF) Steel Slag for Railway Ballast Material

et al. 2018

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Railway ballast, for which natural crushed stone aggregates have been generally used, is an essential track component for the distribution of train loads along the rails and sleepers to the roadbed. However, the use of natural crushed stone aggregate causes environmental destruction as well as dust production in train service. This paper evaluates the feasibility of using the basic oxygen furnace (BOF) steel slag as railway ballast material. A series of physical and chemical quality tests are performed to investigate the characteristics of the materials associated with the effect of aging period due to the remaining free CaO and MgO in the BOF steel slag. Three different aging periods (i.e., 0, 3, and 6 months) are used to compare with various standards and the properties of the crushed stone aggregates. It is demonstrated that the physical and chemical properties of the BOF steel slag with different aging periods satisfy all requirements of standards sufficiently. Especially, the BOF steel slag without aging (i.e., 0 month) provides the similar physical and chemical properties, when compared to the BOF steel slag with aging (i.e., 3 and 6 months). Thus, it is possible to apply the BOF steel slag regardless of aging periods to the railway ballast materials instead of natural crushed stone aggregates.

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Field Evaluation and Durability Analysis of an Eco-Friendly Prestressed Concrete Sleeper

Cited by 19 publications

References 8 publications

Field Tests on Eco-Friendly Railway Precast Concrete Slab

Field Tests on Eco-Friendly Railway Precast Concrete Slab

Structural behaviour of prestressed concrete sleepers produced with high performance recycled aggregate concrete

A Feasibility Study on the Application of Basic Oxygen Furnace (BOF) Steel Slag for Railway Ballast Material

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