Silica (SiO2) Content on Mechanical Properties of Cement-Bonded Particleboard Manufactured from Lignocellulosic Materials

Abstract

The infl uence of Nano-SiO 2 (NS) content and lignocellulosic material addition on hydration behavior of cement paste was studied through measurement of hydration temperature, initial and fi nal setting time of cement paste and compressive strength of hardened cement paste. Besides, the amount of NS, particle size of reed and bagasse as lignocellulosic materials and bagasse to reed particles weight ratio were selected as manufacturing variables for cement-bonded particleboard (CBPB) each at fi ve levels. The relationships between independent parameters and output variables (modulus of rupture (MOR), modulus of elasticity (MOE) and internal bonding (IB)) were modeled using response surface methodology (RSM) based on mathematical model equations (second-order multiple linear regression model) by computer simulation programming. The results indicated that cement pastes containing 3 wt.% Nano-SiO 2 content mixed with milled reed or bagasse particles enhanced maximum hydration temperature; however, the time of reaching the main rate peak shortened. Besides, the increase of SiO 2 replacement shortened the setting time. On the other hand, using reed particles, initial and fi nal setting times of cement prolonged, while bagasse particles shortened initial and fi nal setting times. Analysis of variance (ANOVA) was performed to determine the adequacy of the mathematical model and its respective variables. The interaction effect curves of the independent variables obtained from simulations showed a good agreement between the measured MOR, MOE and IB of CBPB and predicted values obtained by the developed models, and hence, the proposed concept was verifi ed.

Performance of ANN in Predicting Internal Bonding of Cement Particleboard Manufactured from Giant Reed and Bagasse

“…According to Xie et al (2016), the intensity of the changes in the hydration behavior of lingo-cement systems is related to differences in the existing amount of poisonous component in the lignocellulosic materials such as sugars, which delay the hydration process. In order to accelerate the hydration process and according to the fi rst step of this study (Nazerian et al, 2018), it was determined that the addition of pozzolanic materials such as SiO 2 can accelerate the hydration process, so that adding 3 % nano SiO 2 (based on cement weight) to the cement paste even containing bagasse or reed fi ne particle raised the maximum hydration temperature, while the time of reaching the main rate peak shortened. Also, the increase of SiO 2 replacement shortened the setting time.…”

Sunflower (Helianthus Annuus) Stalks as Alternative Raw Material for Cement Bonded Particleboard

“…Wood-cement boards are usually made of wood fibers or particles mixed with cement, water and some additives in order to speed up the bonding process (Marteinsson and Gudmundsson, 2018). They have been already used almost everywhere in the world mainly for roofs, floors and walls (Nazerian et al, 2018). Their advantages compared to composites produced with organic resins including durability, dimensional stability, acoustic and thermal insulation properties and low production cost make them attractive (Lee, 1984;Ramirez-Coretti et al, 1998;Savastano et al, 2003;Okino et al, 2005;Del Menezzi et al, 2007).…”

Investigation of the usability of apple tree pruning chips as an alternative raw material to produce cement bonded particleboard

“…Most of the references given above-used pretreatments such as cold or hot water to the particles in order to overcome inhibition. Titanium oxide nanoparticles [16] and nano SiO2 [17] were also found promising in order to improve the physical and mechanical properties of cement-bonded particleboard produced from agricultural waste.…”