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R.M. van Kammen
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LIGNISLAB
A Modular Floor System made from a Hot-pressed Fibre Biocomposite
The construction sector’s transition toward a circular, low-carbon built environment demands a fundamental rethinking of structural systems. Floors account for up to 40% of a building’s embodied carbon, yet conventional floor systems are designed without consideration for material recovery or reuse. This thesis develops a conceptual modular floor system from a hot-pressed
fibre biocomposite, addressing both embodied carbon reduction and circular construction through design for disassembly.
The research combines a theoretical framework, experimental material characterisation, design development and structural verification. The theoretical framework establishes three pillars: An analysis of conventional floor systems revealing proven structural principles and a persistent trade-off between structural and environmental performance, an exploration of biocomposites as a promising structural direction, and the principles that enable modularity. A lignin-bound pine fibre biocomposite developed by Lignitec is selected and mechanically tested, revealing exceptional compressive strength alongside
limited tensile capacity. Together, the framework and test results inform a no-tension design strategy in which prestressing keeps the entire cross-section in compression, allowing discrete modules to collectively form a spanning element without bonded connections.
The resulting system consists of ribbed, hot-pressed modules assembled through prestressing into a coherent spanning element. This design was developed across three scales: module, spanning element and floor system allowing a fully integrated design. A 1:5 scale prototype confirmed both the producibility of the concept and the validity of the analytical calculations. The results demonstrate that a structurally viable, fully biobased and demountable floor system is achievable, though further research and development are necessary before the system can reach practical application. ...
fibre biocomposite, addressing both embodied carbon reduction and circular construction through design for disassembly.
The research combines a theoretical framework, experimental material characterisation, design development and structural verification. The theoretical framework establishes three pillars: An analysis of conventional floor systems revealing proven structural principles and a persistent trade-off between structural and environmental performance, an exploration of biocomposites as a promising structural direction, and the principles that enable modularity. A lignin-bound pine fibre biocomposite developed by Lignitec is selected and mechanically tested, revealing exceptional compressive strength alongside
limited tensile capacity. Together, the framework and test results inform a no-tension design strategy in which prestressing keeps the entire cross-section in compression, allowing discrete modules to collectively form a spanning element without bonded connections.
The resulting system consists of ribbed, hot-pressed modules assembled through prestressing into a coherent spanning element. This design was developed across three scales: module, spanning element and floor system allowing a fully integrated design. A 1:5 scale prototype confirmed both the producibility of the concept and the validity of the analytical calculations. The results demonstrate that a structurally viable, fully biobased and demountable floor system is achievable, though further research and development are necessary before the system can reach practical application. ...
The construction sector’s transition toward a circular, low-carbon built environment demands a fundamental rethinking of structural systems. Floors account for up to 40% of a building’s embodied carbon, yet conventional floor systems are designed without consideration for material recovery or reuse. This thesis develops a conceptual modular floor system from a hot-pressed
fibre biocomposite, addressing both embodied carbon reduction and circular construction through design for disassembly.
The research combines a theoretical framework, experimental material characterisation, design development and structural verification. The theoretical framework establishes three pillars: An analysis of conventional floor systems revealing proven structural principles and a persistent trade-off between structural and environmental performance, an exploration of biocomposites as a promising structural direction, and the principles that enable modularity. A lignin-bound pine fibre biocomposite developed by Lignitec is selected and mechanically tested, revealing exceptional compressive strength alongside
limited tensile capacity. Together, the framework and test results inform a no-tension design strategy in which prestressing keeps the entire cross-section in compression, allowing discrete modules to collectively form a spanning element without bonded connections.
The resulting system consists of ribbed, hot-pressed modules assembled through prestressing into a coherent spanning element. This design was developed across three scales: module, spanning element and floor system allowing a fully integrated design. A 1:5 scale prototype confirmed both the producibility of the concept and the validity of the analytical calculations. The results demonstrate that a structurally viable, fully biobased and demountable floor system is achievable, though further research and development are necessary before the system can reach practical application.
fibre biocomposite, addressing both embodied carbon reduction and circular construction through design for disassembly.
The research combines a theoretical framework, experimental material characterisation, design development and structural verification. The theoretical framework establishes three pillars: An analysis of conventional floor systems revealing proven structural principles and a persistent trade-off between structural and environmental performance, an exploration of biocomposites as a promising structural direction, and the principles that enable modularity. A lignin-bound pine fibre biocomposite developed by Lignitec is selected and mechanically tested, revealing exceptional compressive strength alongside
limited tensile capacity. Together, the framework and test results inform a no-tension design strategy in which prestressing keeps the entire cross-section in compression, allowing discrete modules to collectively form a spanning element without bonded connections.
The resulting system consists of ribbed, hot-pressed modules assembled through prestressing into a coherent spanning element. This design was developed across three scales: module, spanning element and floor system allowing a fully integrated design. A 1:5 scale prototype confirmed both the producibility of the concept and the validity of the analytical calculations. The results demonstrate that a structurally viable, fully biobased and demountable floor system is achievable, though further research and development are necessary before the system can reach practical application.