Vol 17, No 3 (2013) > Articles >

Surface Treatment of Fly Ash for Improving the Tensile Strength of Fly Ash/Unsaturated Polyester Composites

Sugiman Sugiman 1 , Paryanto Setyawan 1


  1. Department of Mechanical Engineering, Faculty of Engineering, University of Mataram, Mataram 83125, Indonesia



The  paper  presents  the  surface  treatment  of  fly  ashes  using  acid  and  alkali  solution  on  the  tensile  strength  of  the  fly ash/unsaturated  polyester  (UP)  composites.  Sulfuric  acid  (H2SO4),  hydrofluoric  acid  (HF)  and  sodium  hydroxide (NaOH) solution with concentration of 0%, 5%, 10%, 15%, and 20% (by weight) were used for surface treatment of fly ashes. Generally, the tensile strength of the treated fly-ash/UP composites shows a significant increase compared to the untreated  fly  ash.  Of  all  surface  treatments  studied,  the optimum  tensile  strength  was  obtained  at  a  concentration  of 10%.  At  this  concentration,  at  a  fly  ash  content  of  30%  (weight),  the  surface  treatment  using  NaOH  gave  the  highest tensile strength, approximately 18.69 MPa, or increased about 91% compared to the untreated fly ash. The morphology of fracture surfaces were evaluated using a scanning electron microscope (SEM). The fracture surfaces of the treated fly ash composite were rougher than that of the untreated fly ash indicating the improvement of the fly ashes-UP interaction.

Keywords: composites, fly ash, surface treatment, tensile strength, unsaturated polyester
Published at: Vol 17, No 3 (2013) pages: 128-132

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