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Technical Article!

Technical Article


THE USE OF LIGNOCELLULOSIC FIBERS IN CEMENT BASED MATERIALS – CHALLENGES AND ACHIEVEMENTS

Vegetable fibers in the macro, micro and nanometric scales have been studied as reinforcement in cementitious materials. In nanoscale, the nanofibrillated cellulose has the advantage of having good mechanical performance and high specific surface, which contributes to improve the adhesion with the cementititous matrix. In hybrid reinforcement, with micro and nanofibers, nanofibrillated cellulose forms bonding with the matrix and acts as stress transfer bridges in the nano-cracking with corresponding strengthening of the cementitious composite even before the crack formation. Referring to the production processing, slurry dewatering followed by pressing has the advantage of favoring the dispersion of a higher amount of microfibers in homogeneous distribution (2D). The extrusion process strongly depends on the rheological characteristics of the fresh cement material but it can better organize the microstructure of the fiber cement due to the partial orientation of the fibers in the extruder direction. Curing process plays a key role in the performance of the final product and can contribute to mitigate the problem with durability of the materials and the corresponding effects on the mechanical performance of the composites. Degradation tests are crucial for the evaluation of the durability of the resulting materials and components in real applications exposed to different environmental conditions as roofing, partitioning or ceiling elements. The mechanical, physical, thermal and microstructure results both in the short and in the long term, demonstrate that lignocellulose fibers are suitable for more sustainable and high performance components for civil construction with adequate behavior for housing and infrastructure.

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