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.

Bahasa Abstract

Perlakuan Permukaan Fly Ash untuk Meningkatkan Kekuatan Tarik Komposit Fly Ash/Poliester Tak Jenuh. Paper ini menyajikan perlakuan permukaan fly ash (abu terbang) menggunakan larutan asam dan alkali pada kekuatan tarik komposit abu terbang/poliester tak jenuh. Larutan asam sulfat (H2SO4), asam fluorida (HF) dan natrium hidroksida (NaOH) dengan konsentrasi 0%, 5%, 10%, 15%, dan 20% (berat) digunakan untuk perlakuan permukaan abu terbang. Secara umum, kekuatan tarik komposit abu terbang/poliester tak jenuh dengan perlakuan permukaan menunjukkan peningkatan yang signifikan dibanding abu terbang tanpa perlakuan. Dari semua perlakuan permukaan yang dipelajari, kekuatan tarik optimum diperoleh pada konsentrasi larutan 10%. Pada konsentrasi tersebut, pada kandungan abu terbang 30% berat, perlakuan permukaan dengan larutan NaOH memberikan kekuatan yang paling tinggi sekitar 18,69 MPa atau meningkat 91% dibanding fly ash tanpa perlakuan. Berdasar pada morfologi patahan sampel yang dievaluasi dengan scanning electron microscope (SEM), permukaan patah komposit abu terbang dengan perlakuan lebih kasar dibanding tanpa perlakuan yang menunjukkan perbaikan interaksi antara abu terbang dan resin poliester tak jenuh.


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