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

Sugiman Sugiman • Paryanto Dwi Setyawan
Journal article Makara Journal of Technology • December 2013


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.




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