the dry or wet process of individualizing the fibers renders to a limited extend the fibrillation effects to plant pulp fibers the end product of individualization and mixing of plant pulp fibers in concrete after curing of concrete is a hardened concrete material within which individual fibers are uniformly dispersed the affinity of plant pulp fibers for water facilitates the transfer of cement particles which are dispersed in water to the vicinity of fibers and provides for dense interface zones the relatively small diameter of fibers which is of the same order of magnitude as cement particle size also does not disrupt the development and spatial distribution of cement hydration products which is not the case with larger diameter fibers the fact that plant pulp fibers provide sites for hydrogen bonding leads to the formation of hydrogen bonds between the pulp fibers and the cement based matrix if concrete is relatively dry this bonding favors the reinforcement effects of plant pulp fibers in concrete when concrete gets saturated the presence of moisture could reduce the hydrogen bonding of pulp fibers to concrete however the fact that plant fibers swell in the presence of moisture produces compressive stresses between the saturated fibers and concrete.