Abstract
The effects of fiberglass plaster mesh (FPM) as reinforcement on some physical and mechanical properties of cement bonded particleboard (CBP) were examined. Experimental CBP with and without FPM were manufactured in laboratory conditions using wood particles, cement, tap water and chemical accelerators. Two plies of FPM, manufactured using fiberglass and polyester resin, were laid within the experimental CBP. The target density of CBP was 1300 kg/m3 in the study. Three different types of chemical accelerators (CaCl2, KCl, DARASET ® 580) were used in the experiments. Properties of CBP evaluated include 2- and 24-hour - thickness swelling (TS), 2- and 24-hour - water absorption (WA) and bending stiffness (MOE) and strength (MOR). The results indicate that all the board properties tested were significantly improved by FPM application. The average MOE values of the CBP boards with FPM was two times higher than those of the boards without FPM. Dimensional stability and MOR of the CBP boards were also significantly improved with the use of FPM. FPM can be used to improve inferior properties of the CBP, so as to make it more compatible with other wood based construction materials.
Highlights
The use of fiberglass plaster mesh (FPM) did not significantly alter the density of the cement bonded particleboard (CBP) manufactured. 2- and 24-hour thickness swelling (TS) values of the CBP vary between 2.39 % - 12.39 % and 2.6 % 16.57 %, respectively
The average 2-hour - TS values (3.66 %) of 33% wood boards were increased to 5.425 % when the amount of wood particles was increased to 50 %
The results indicated that embedment of two plies of FPM near the surface of CBP improves MOE and MOR as well as resistance to TS and water absorption (WA)
Summary
Cement bonded boards, which are a mixture of wood particles with cement, water and some additives (Marteinsson and Gudmundsson, 2018), have been in use for almost a century. In order to improve flexural properties of CBP, some pretreatments such as cold or hot water soaking of the particles were found promising (Frybort et al 2008). Solid wood and wood-based materials are reinforced with fiberglass and remarkable improvements in bending and other properties were observed (Smulski and Ifju, 1987). Fonseca et al (2011) evaluated the influence of fiberglass reinforcement in plywood panels Their results showed a 58 % and 43 % increase in bending strength for both longitudinal and transverse directions, respectively. Experimental CBP were prepared with and without FPM (Table 2) as follows: first, wood particles were sprayed with water that contains previously dissolved accelerator. The obtained results were compared to standard values of TS EN 634-2
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