A Review of Tropical Hardwood Engineered Timber Sleepers: Static–Impact Behaviour and Finite Element Modelling of GLT Systems for Railway Tracks

Umar A. M, Kaura J. M., Wilson U. N.

Abstract


Engineered timber products such as glued-laminated timber (GLT) and cross-laminated timber (CLT) are increasingly proposed as sustainable alternatives to conventional concrete and steel sleepers in railway track systems. This paper presents a structured review of experimental, numerical, and analytical studies on GLT/CLT members and railway sleepers, with particular emphasis on tropical hardwoods and adhesive-bonded systems. The literature reviewed covers: timber engineering and GLT/CLT development; adhesive bonding and bond-line performance; static, impact, bending, and compressive behaviour of sleepers and related structural members; and characterization of tropical hardwood species such as Lophira alata, Gmelina arborea, and Eucalyptus camaldulensis. The review shows that GLT and CLT members can achieve high stiffness and strength, favourable impact energy absorption, and competitive life-cycle performance compared with concrete and polymer sleepers, with GLT systems demonstrating up to 30% lower CO₂ emissions and 20–35% higher impact energy absorption relative to prestressed concrete benchmarks. Adhesive systems such as polyurethane (PUR), epoxy, phenol-resorcinol, and resorcinol-formaldehyde (RF) are critical to bond-line performance, with several studies demonstrating enhanced shear strength and durability in wet conditions. Experimental and numerical work on sleepers’ timber, composite, and concrete provides a robust basis for understanding static and dynamic response, fatigue, and damage mechanisms. However, significant gaps remain regarding long-term creep and fatigue performance of GLT sleepers made from tropical hardwoods, environmental degradation of adhesives under tropical climate cycles, and full-scale in-situ validation under realistic traffic and ballast conditions. The paper synthesizes these findings, identifies specific research gaps strictly grounded in the reviewed studies, and outlines implications for further research on GLT sleepers for tropical railway networks, particularly in West Africa.. 


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References


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