Fibre classification and properties

The classification and properties of natural fibres for cement reinforcement have been reviewed in several publications [1-5]. Cook [1,2] has suggested four classes of fibres, based on their morphology stem (or bast), leaf, surface and wood. 

Wood (cellulose) fibresate relatively short and inflexible, but are usually strong and perform better during long ageing in cement environment. Wood chips are 

Property Jute [3] Sisal [3] Coconut [3] Sugar cane [2] Bagasse [3] 

Cook [1,2] has pointed out that in view of these structural characteristics, the properties of the fibre material itself (i.e, the cell walls) can be different by about 70-100% from the properties of the fi bre, because the latter consists of an assembly of fibre cells, grouped together in a variety of microstructures. The strength and other properties of the fibre material in the individual cell can be higher than those of the actual fibre, and this often leads to confusion in the data reported in the literature. The differences in the values reported in the two sources which are compared in Table 11.1 for bagasse fibres, probably reflect such influences, as well as perhaps variability in the fibre properties. 

---