Investigation of Cross Laminated Timber and Fibre-Reinforced Concrete Composite Slabs

Abstract

Cross‑laminated timber–fibre‑reinforced concrete (CLT‑FRC) composite floor systems, commonly referred to as timber–concrete composites (TCC), are gaining attention as lighter, lower‑carbon alternatives to conventional steel‑reinforced concrete slabs. This bachelor’s thesis summarises recent experimental research to clarify their structural behaviour and design implications.

Three contemporary peer‑reviewed test programmes were selected for detailed examination. Their full‑ or large‑scale bending, slip and vibration results were assessed qualitatively alongside predictions from Eurocode‑based analytical methods, a widely cited closed‑form model and finite‑element simulations. Emphasis was placed on the influence of connector layout, interface preparation and concrete mix on composite action.

The review indicates that when appropriately detailed, CLT‑FRC slabs can satisfy common serviceability and strength criteria while delivering meaningful reductions in self‑weight and embodied carbon. Existing analytical approaches remain conservative, implying that calibrated adjustments could unlock further material efficiency without compromising safety. Practical considerations, such as the use of screw‑based connectors and prefabricated panel construction, are also highlighted for their potential to streamline site operations.

These insights support the broader adoption of CLT‑FRC composite floors in low‑ and medium‑rise buildings and identify research priorities, including refined design rules for partial composite action and the development of robust, field‑friendly connector systems.

Keywords: Cross‑laminated timber, fibre‑reinforced concrete, timber–concrete composite, bending behaviour, vibration, shear connection, sustainable construction