Various papers report the success of using eucalyptus species for the production of CBPB or solid wood flooring (Iwakiri and Prata 2008; Mori et al.
The primary problem faced in manufacturing CBPB is the inhibitory effect caused by wood on the cure of cement.
These characteristics, in addition to the high resistance to fire, other microorganism, and humidity, may make eucalyptus CBPB a great substrate for the many top Brazilian hardwood species used in assembling engineered flooring.
Wood wastes from the eucalyptus products (plywood, veneer, MDP, cellulose, MDF, sawnwood) could be a source of raw material for the production of CBPB.
No study is available in Brazil on the application of CBPB for flooring.
The CBPB panels were sent to the Forest Products Laboratory (LPF) in Brasilia, Brazil, and finished by overlaying one face either with wood or with veneer for producing the flooring panels.
Four kinds of commercial glues, used for bonding solid and laminated wood flooring, were used in assembling the wood or veneer to the CBPB panels.
The density at 12 percent MC of the CBPB flooring panels overlaid with wood of tauari (density of 0.792 g/[cm.sup.3]) varied from 1.16 to 1.19 g/[cm.sup.3] and was statistically different from those overlaid with veneers of cumaru, whose density ranged from 1.31 to 1.36 g/[cm.sup.3].
The A503 and A602 glues did not resist the humidity test and, despite the good dimensional stability, the overlay was detached from the CBPB. In fact, the dimensional stability is conferred by the wood-cement panel.
These results are well above the specifications of major CBPB producers, such as Bison type HZ cement-bonded boards (3,000 MPa) (NCL Group 2009), Versaroc (4,949 MPa) (Versaroc 2009), and Cetris (4,500 MPa) (Cetris 2009), all having application for floorings.
The same behavior was not observed regarding the MOR: samples of CBPB overlaid with the XB glue presented lower resistance than those with the A602 and PR glues.
The response of flooring panels overlaid with phenol-resorcinol (PR) and cross-linking (XB) resins was positive in the glueline between the substrate (CBPB panel) and the overlaid used (wood laminate or veneer).