%A Aditya Nugroho Dwi Roso
%T PENGARUH VARIASI KONSENTRASI SERBUK SILIKA 
(SiO₂) TERHADAP KEKUATAN GESER PADA SAMBUNGAN 
ALUMINIUM 6061 BERPEREKAT DEXTONE
%D 2026
%X Adhesively bonded joints can serve as a temporary alternative to welding in emergency situations for aluminum structures, as they are able to distribute stress more uniformly without causing thermal damage. This study aims to analyze the effect of silica powder addition at 0%, 5%, 10%, and 15% by weight on the shear strength of single lap joints made of aluminum 6061 bonded using commercial epoxy adhesive Dextone. Specimens were prepared in accordance with ASTM D1002 and tested using a Universal Testing Machine (UTM) to determine shear strength, while Fourier Transform Infrared Spectroscopy (FTIR) was employed to identify the chemical characteristics of the adhesive layer. The test results show that the addition of 5% silica produces the highest shear stress value of 3.303 MPa, representing an increase of 68.87% compared to epoxy without silica. Silica contents above 5% lead to a reduction in shear strength due to particle agglomeration and non-uniformity within the adhesive layer. FTIR spectra indicate the presence of typical epoxy functional groups and an increased Si–O–Si absorption band without altering the main chemical structure of the resin. Based on these results, the addition of 5% silica is identified as the precise composition for improving the shear strength of aluminum 6061 joints bonded with Dextone epoxy.
%I Fakultas Teknik Universitas Sultan Ageng Tirtayasa
%L eprintuntirta59157
%O Sambungan berperekat menjadi alternatif pengganti pengelasan sementara ketika disituasi darurat pada aluminium karena mampu mendistribusikan tegangan secara lebih merata tanpa menimbulkan kerusakan termal. Penelitian ini bertujuan menganalisis pengaruh penambahan serbuk silika sebesar 0%, 5%, 10%, dan 15% berat terhadap kekuatan geser sambungan tumpang tunggal aluminium 6061 yang direkatkan menggunakan epoxy komersial Dextone. Spesimen dibuat sesuai standar ASTM D1002 dan diuji menggunakan (Universal Testing Machine) untuk mengetahui kekuatan geser, serta FTIR (Fourier Transform Infrared Spectroscopy) untuk mengidentifikasi karakteristik kimia lapisan perekat. Hasil pengujian menunjukkan bahwa penambahan silika 5% menghasilkan nilai tegangan geser tertinggi sebesar 3,303 MPa, meningkat 68,87% dibandingkan epoxy tanpa silika. Penambahan silika di atas 5% menyebabkan penurunan kekuatan geser akibat ketidakseragaman dan aglomerasi partikel dalam lapisan perekat. Spektrum FTIR menunjukkan keberadaan gugus fungsi khas epoxy dan penguatan pita Si–O–Si tanpa perubahan struktur kimia utama resin. Berdasarkan hasil tersebut, penambahan silika 5% dinyatakan sebagai komposisi yang tepat untuk meningkatkan kekuatan geser sambungan aluminium 6061 menggunakan epoxy Dextone.