Fibres - The length of fibers may vary from 1 to 2 in. (25 to 500 mm). Because natural fibers are naturally available materials, they are not uniform in diameter and length. Typical values of diameter for unprocessed natural fibres vary from 0.004 to 0.03 in. (0.10 to 0.75 mm).
Methods of mixing- The two methods of mixing and placing are:-
1.Wet mix
2. Dry-compacted mix.
In the wet mix, a low volume fraction of fibres is used. The water to be added to the mix has to take into account the high natural water content in the natural fibers