Use of cellulose fibers from hemp core in fiber-cement production. Effect on flocculation, retention, drainage and product properties

The aim of this paper is to study the feasibility of using cellulose fibers obtained from an agricultural waste, hemp core (Cannabis Sativa L.), through different new environmental friendly cooking processes for fiber-cement production. The physical and mechanical properties of the fiber reinforced concrete, which depend on the nature and morphology of the fibers, matrix properties and the interactions between them, must be kept between the limits required for its application. Therefore, the morphology of the fibers and how its use affects the flocculation, retention and drainage processes in the fiber-cement manufacture, and the mechanical and physical properties of the fiber-cement product have been studied.The use of pulp obtained by means of the hemp core cooking in ethanolamine at 60% concentration at 180 °C during 90 min resulted in the highest solids retention and the best mechanical properties among the studied hemp core pulps.

► Different cooking processes and conditions used to obtain pulp from hemp core. ► Effect of cooking conditions on the morphology of hemp core fibers and pulps. ► Hemp fiber effect on flocculation, retention and drainage of fiber-cement slurry. ► Hemp fiber effect on physical and mechanical properties of fiber-cement probes.