Biocomposites reinforced with natural fibers: 2000–2010

https://upcommons.upc.edu/bitstream/handle/2117/26136/Ardanuy?sequence=5

Cellulosic fiber reinforced cement-based composites: A review of recent research

https://repositorium.sdum.uminho.pt/bitstream/1822/10832/1/Vegetable%20fibres.pdf

Cementitious building materials reinforced with vegetable fibres : a review

Environmentally-friendly monofilament cellulosic fibres have been widely used as alternatives for conventional steel reinforcement within concrete. Recently, the use of cellulosic fibre fabrics and their fabric reinforced polymer composites as reinforcement materials within and/or outside of construction materials (e.g. concrete) has gained popularity due to their inexpensive cost and favourable specific mechanical properties compared with synthetic fibre fabrics (e.g. E-glass). This review presents a summary of recent development on cellulosic fibre Fabric Reinforced Cementitious (FRC) and Fabric Reinforced Geopolymer (FRG) composites, as well as their cellulosic Fabric Reinforced Polymer (FRP) composites as reinforcements of concrete, masonry and timber structures for civil engineering applications. This review covers: (1) properties (i.e. chemical composition, microstructure, mechanical properties and cost) of monofilament cellulosic fibres and their comparison with synthetic fibres, the relationship between fibre chemical composition and fibre mechanical properties, parameters affect fibre properties; (2) properties (e.g. fabrication of monofilament fibres to fabrics and structures) of cellulosic fibre fabrics, properties of polymer matrices, and properties (i.e. flexural, tensile, impact, insulation and fire properties) of cellulosic fabric FRP composites; and (3) properties (compressive, flexural and tensile and impact properties) of cellulosic FRC and FRG composites, and the properties of cellulosic FRP composites reinforced concrete, masonry and timber structures. In addition, the degradation mechanisms of cellulosic FRC and FRP are discussed. Furthermore, the durability of FRC, FRG and FRP composites are reviewed and the methods to improve the durability of FRC, FRG and FRP composites from the aspects of fibre modification and matrix modification are reviewed and summarized.

A review of recent research on the use of cellulosic fibres, their fibre fabric reinforced cementitious, geo-polymer and polymer composites in civil engineering

The quest for sustainability in construction material usage has made the use of more renewable resources in the construction industry a necessity. Plant-based natural fibres are low cost renewable materials which can be found in abundant supply in many countries. This paper presents a summary of research progress on plant-based natural fibre reinforced cement-based composites. Fibre types, fibre characteristics and their effects on the properties of cement-based materials are reviewed. Factors affecting the fresh and hardened properties of cement-based composites reinforced with plant-based natural fibre are discussed. Measures to enhance the durability properties of cement-based composites containing plant-based natural fibres are appraised. Significant part of the paper is then focused on future trends such as the use of plant-based natural fibres as internal curing agents and durability enhancement materials in cement-based composites. Finally, applications and recommendations for future work are presented.

Plant-based natural fibre reinforced cement composites: A review

Effect of accelerated carbonation on cementitious roofing tiles reinforced with lignocellulosic fibre

This work evaluates the influence of three different intensities of refinement of sisal pulp and the effect of accelerated aging cycles on the behavior of composites. Fiber-cements were prepared by the slurry de-watering method and pressing as a crude simulation of the Hatschek process. Mechanical behavior of composites was evaluated by four-point bending test at 28 days, and after 50 and 100 wet/dry cycles. Refinement of pulp and aging have increased the strength and bulk density of composites and decreased the toughness and porosity. The best mechanical performance after aging was achieved for samples with highly refined fibers.

Performance and Durability of Cement Based Composites Reinforced with Refined Sisal Pulp

The influence of the matrix formulation and different amounts of synthetic fiber on physical and mechanical performance of asbestos free fiber cement was evaluated. Polyvinyl alcohol (PVA) fiber was tested as reinforcement in combination with mechanical and kraft cellulose pulps. Silica-fume, metakaolin and fly ash were used as pozzolanic additions in proportions up to ∼14% by mass in combination with ordinary Portland cement and carbonatic filler. Bulk densities of composites varied from 1.5 to 1.7 g/cm 3 . Synthetic fiber contents higher than 2% by mass (from 4% to 5% by volume of the composite) were unable to promote any further improvement in the mechanical performance of the composites at the age of 28 days. Formulations with silica fume showed better strength performance for the composites after accelerated aging test. The toughness measurements of composites after exposition to soak and dry cycles also showed that silica fume seems to prevent cellulose fiber degradation.

/pdf/the-effect-of-different-mineral-additions-and-synthetic-53qz9goez3.pdf

The effect of different mineral additions and synthetic fiber contents on properties of cement based composites

The present work describes non-conventional sisal (Agave sisalana) chemical (organosolv) pulp from residues of cordage as reinforcement to cement based materials. Sisal organosolv pulp was produced in a 1:1 ethanol/water mixture and post chemically and physically characterized in order to compare its properties with sisal kraft pulp. Cement based composites reinforced with organosolv or kraft pulps and combined with polypropylene (PP) fibres were produced by the slurry de-watering and pressing method as a crude simulation of the Hatschek process. Composites were evaluated at 28 days of age, after exposition to accelerated carbonation and after 100 soak/dry cycles. Composites containing organosolv pulp presented lower mechanical strength, water absorption and apparent porosity than composites reinforced with kraft pulp. The best mechanical performance after ageing was also achieved by samples reinforced with kraft pulp. The addition of PP fibres favoured the maintenance of toughness after ageing. Accelerated carbonation promoted the densification of the composites reinforced with sisal organosolv + PP fibres.

/pdf/sisal-organosolv-pulp-as-reinforcement-for-cement-based-43k250of6k.pdf

Sisal organosolv pulp as reinforcement for cement based composites

The main objective of this work was to evaluate the effect of the incorporation of different types of synthetic fibers and cellulose pulp in the toughness and strength of fiber reinforced cementitious composites. The studies included an assessment of the mechanical and physical behavior and the fiber-matrix interface using scanning electron microscopy at 28 days of age and after accelerated aging test. Ten formulations were prepared with different amounts of synthetic fibers (2.16-4.28% by volume of solid raw materials). The specimens were produced in laboratory by slurring the raw material in water solution (20% of solids) followed by a vacuum drainage of the excess water and pressing. Ten specimens of each formulation were subjected to wet curing for seven days and air cure until the age of 28 days when the mechanical and physical performances were assessed. Other ten specimens for each formulation were exposed to the accelerated aging test (wet-dry cycles). The composites with polyvinyl alcohol (PVA) fibers showed toughness and flexural strength higher than polypropylene (PP) fibers also used in this study. The polyvinyl alcohol fibers formed a strong bond with cementitious matrix due to their hydrophilic nature and geometric characteristics. The results showed that formulations containing PVA fibers presented higher values of MOR than those with the same volumetric percentage of PP fibers at 28 days and after accelerated aging tests. Furthermore, the PVA fibers distribution in the matrix was more homogeneous due to fiber dispersion as shown in the SEM analysis for the fiber amounts under consideration.

/pdf/some-properties-of-fiber-cement-composites-with-selected-rwn42wb2fq.pdf

Ana Paula Joaquim

Papers

Effect of accelerated carbonation on cementitious roofing tiles reinforced with lignocellulosic fibre

Performance and Durability of Cement Based Composites Reinforced with Refined Sisal Pulp

The effect of different mineral additions and synthetic fiber contents on properties of cement based composites

Sisal organosolv pulp as reinforcement for cement based composites

Some properties of fiber-cement composites with selected fibers