Effects of Nano-Wollastonite on Screw Withdrawal Capacity of Oriented Strand Lumber

Hamid R Taghiyari^1*, Vahid Hassani¹, Sadegh Maleki¹ and Eckelman CA¹

¹Wood Science and Technology Department, Faculty of Civil Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran

²Department of Wood Science and Technology, Faculty of Natural Resources, Tarbiat Modares University, Tehran, Iran

³Department of Forestry and Natural Resources, Purdue University, W. Lafayette, USA

*Corresponding Author : Hamid Reza Taghiyari (Associate Prof.)
Faculty of Civil Engineering, Shahid Rajaee Teacher Training University (SRTTU), Lavizan, Shabanloo St., Tehran, Iran
Tel: + 98 930-2005235
Fax: + 98-21 22970021
E-mail: htaghiyari@srttu.edu, htaghiyari@yahoo.com

Received: July 11, 2017 Accepted: August 05, 2017 Published: August 11, 2017

Citation: Taghiyari HR, Hassani V, Maleki S, Eckelman CA (2017) Effects of Nano-Wollastonite on Screw Withdrawal Capacity of Oriented Strand Lumber. J Nanomater Mol Nanotechnol 6:4. doi: 10.4172/2324-8777.1000224

The effect of changes of urea-formaldehyde resin content and nanowollastonite content on the withdrawal capacities of sheet metal screws and medium density fiberboard screws from the edge, face, and end surfaces of oriented strand lumber were investigated. The panels were produced with two urea-formaldehyde resin contents (8% and 10%), and two nano-wollastonite contents (10% and 20%). Specimens were prepared and tested according to ASTM standard D 1761-88. Sheet metal screws had a higher withdrawal capacity than medium density fiberboard screws. Withdrawal capacity in the face and edge directions were significantly higher than in the end direction. Changes in urea-formaldehyde resin content had no effect on screw withdrawal capacity in any of the three directions, implying that compaction in the composite panels had higher impact on screw withdrawal strength in comparison to the increase in resincontent from 8% to 10%. However, addition of NW resulted in a decrease in withdrawal capacity values at both resin levels in all directions.