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Influence of different surface treatments on the water absorption capacity of flax fibres: Rheology of fresh reinforced-mortars and mechanical properties in the hardened state
https://orcid.org/0000-0001-9629-3554
Highlights Coating flax fibres with linseed oil reduces water absorption and improves mortar workability. The large specific surface area of flax fibres is mainly responsible for the workability disturbances. None of the surface treatments experienced improved the mechanical properties of the cured composite. None of the surface treatments experienced improved the durability of flax fibres within the cement matrix.
Abstract An experimental investigation was undertaken on the influence of different surface treatments of flax fibres on mortar properties in both fresh and hardened states. Three types of coating were explored for surface modification: atmospheric-pressure plasma, mineral coating made of a grout of cement and ground granulated blast-furnace slag, and polymer coating based on linseed oil. Water absorption tests were performed to evaluate the performance of the coatings. Water absorption kinetics and/or water retention capacity were drastically modified by the plasma treatment at atmospheric-pressure and by the linseed oil treatment. The workability of the pastes incorporating fibres coated with the cement grout or linseed oil was greatly improved compared to the raw fibres. The presence of fibres significantly increases the rate of entrapped air, which seems to depend on the nature of the coating. In the hardened state, regardless of the nature of the fibre coating, the flexural strength increases beyond 90 days of curing. Up to 320 days of curing, the compressive strengths of the different composites are similar to that of the control mortar, except for the composite with linseed oil coated-fibres which proves to be the most porous. The presence of flax fibres also enhances the mortar toughness and prevent from desiccation cracking. Nevertheless, none of the treatments experimented in this work makes it possible to preserve the beneficial effects of fibres on the mechanical behaviour of composites in the long term.
Influence of different surface treatments on the water absorption capacity of flax fibres: Rheology of fresh reinforced-mortars and mechanical properties in the hardened state
https://orcid.org/0000-0001-9629-3554
Highlights Coating flax fibres with linseed oil reduces water absorption and improves mortar workability. The large specific surface area of flax fibres is mainly responsible for the workability disturbances. None of the surface treatments experienced improved the mechanical properties of the cured composite. None of the surface treatments experienced improved the durability of flax fibres within the cement matrix.
Abstract An experimental investigation was undertaken on the influence of different surface treatments of flax fibres on mortar properties in both fresh and hardened states. Three types of coating were explored for surface modification: atmospheric-pressure plasma, mineral coating made of a grout of cement and ground granulated blast-furnace slag, and polymer coating based on linseed oil. Water absorption tests were performed to evaluate the performance of the coatings. Water absorption kinetics and/or water retention capacity were drastically modified by the plasma treatment at atmospheric-pressure and by the linseed oil treatment. The workability of the pastes incorporating fibres coated with the cement grout or linseed oil was greatly improved compared to the raw fibres. The presence of fibres significantly increases the rate of entrapped air, which seems to depend on the nature of the coating. In the hardened state, regardless of the nature of the fibre coating, the flexural strength increases beyond 90 days of curing. Up to 320 days of curing, the compressive strengths of the different composites are similar to that of the control mortar, except for the composite with linseed oil coated-fibres which proves to be the most porous. The presence of flax fibres also enhances the mortar toughness and prevent from desiccation cracking. Nevertheless, none of the treatments experimented in this work makes it possible to preserve the beneficial effects of fibres on the mechanical behaviour of composites in the long term.
Influence of different surface treatments on the water absorption capacity of flax fibres: Rheology of fresh reinforced-mortars and mechanical properties in the hardened state
https://orcid.org/0000-0001-9629-3554
Highlights Coating flax fibres with linseed oil reduces water absorption and improves mortar workability. The large specific surface area of flax fibres is mainly responsible for the workability disturbances. None of the surface treatments experienced improved the mechanical properties of the cured composite. None of the surface treatments experienced improved the durability of flax fibres within the cement matrix.
Abstract An experimental investigation was undertaken on the influence of different surface treatments of flax fibres on mortar properties in both fresh and hardened states. Three types of coating were explored for surface modification: atmospheric-pressure plasma, mineral coating made of a grout of cement and ground granulated blast-furnace slag, and polymer coating based on linseed oil. Water absorption tests were performed to evaluate the performance of the coatings. Water absorption kinetics and/or water retention capacity were drastically modified by the plasma treatment at atmospheric-pressure and by the linseed oil treatment. The workability of the pastes incorporating fibres coated with the cement grout or linseed oil was greatly improved compared to the raw fibres. The presence of fibres significantly increases the rate of entrapped air, which seems to depend on the nature of the coating. In the hardened state, regardless of the nature of the fibre coating, the flexural strength increases beyond 90 days of curing. Up to 320 days of curing, the compressive strengths of the different composites are similar to that of the control mortar, except for the composite with linseed oil coated-fibres which proves to be the most porous. The presence of flax fibres also enhances the mortar toughness and prevent from desiccation cracking. Nevertheless, none of the treatments experimented in this work makes it possible to preserve the beneficial effects of fibres on the mechanical behaviour of composites in the long term.
Influence of different surface treatments on the water absorption capacity of flax fibres: Rheology of fresh reinforced-mortars and mechanical properties in the hardened state
Page, Jonathan (author) / Khadraoui, Fouzia (author) / Gomina, Moussa (author) / Boutouil, Mohamed (author)
Construction and Building Materials ; 199 ; 424-434
2018-12-10
11 pages
Article (Journal)
Electronic Resource
English
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