The Effect of Coupling Agent on Water Absorption Property of Natural Fiber-Cement Nanocomposites

The purpose nose of this research is to study the effect of coupling agent on microscopy and water absorption properties of nanocomposites which are made by residual sulfite pulp paper fiber and cement. Eight treatments as variable factors including the effect of the two levels of coupling agent based on Amino Silane (0,6 percent of fiber weight) different percentages of Nano silica (0,0.5,1,3 in respect to dry cement weight), the ratio of water and and fiber at 10% on water absorption property of samples were investigated. All specimens are made and tested during the BS 1881: Part 122-1983 standard during three solid, liquid and final blending stages. Microstructure properties are analyzed by Scanning Electron Microscope (SEM). The results demonstrate that water absorption of fabricate nanocomposites decrease compared to control sample which had 10% Asbestos fiber by enhancing nano-silica particles. Additionally water absorption is decreased by adding the coupling agent. On the other hand water absorption decrease by the synergic effect of nano-silica and coupling agent. However, the specimen with 3% nano-silica and 6% coupling agent had the lowest water absorption compared to others. Further- more, improving microstructure of bio-nanocomposites by adding the coupling agent was shown by SEM images.