FARIZY DWITAMA, NIM 112022053 (2026) ANALISIS SILIKA AMORF PADA BETON DENGAN SUBTITUSI ABU TEMPURUNG KELAPA MENGGUNAKAN X-RAY DIFFRACTION (XRD). Skripsi thesis, Universitas Muhammadiyah Palembang.

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Abstract

Beton merupakan material konstruksi yang paling banyak digunakan karena memiliki kemampuan menahan beban tekan yang tinggi. Penelitian ini bertujuan untuk menganalisis karakteristik fase kristalin dan amorf pada beton yang memiliki variasi 0% sampai 6,25% yang menggunakan substitusi abu tempurung kelapa melalui pengujian X-Ray Diffraction (XRD) serta menghubungkannya dengan hasil pengujian kuat tekan beton sehingga dapat diketahui pengaruh perubahan mikrostruktur terhadap sifat mekanis beton. Pada awalnya karakterisasi mineralogi diawali dengan pemotongan sampel terpilih yang di mana data pola difraksinya diolah lewat perangkat lunak Origin 2018 guna menghitung proporsi fase kristalin-amorf sekaligus memetakan perubahan mikrostrukturnya. Hasil penelitian menunjukkan bahwa abu tempurung kelapa memiliki kandungan senyawa pozzolanik pada kelas N, sehingga berpotensi dimanfaatkan sebagai bahan substitusi semen. Pengujian kuat tekan memperlihatkan bahwa variasi 2,5% menghasilkan kuat tekan tertinggi sebesar 26,80 MPa. Pada penambahan abu yang melebihi kadar tersebut menyebabkan penurunan kuat tekan. Analisis XRD menunjukkan bahwa seluruh variasi beton didominasi oleh fase amorf dengan persentase sekitar 97,87–98,99%, sedangkan fase kristalin hanya berkisar 1,01–2,13%. Kesimpulan dari hasil penelitian, bahwa variasi 2,5% merupkan komposisi yang paling optimal karena menghasilkan fase amorf baik. Concrete is one of the most widely used construction materials due to its high compressive strength. This study aimed to analyze the crystalline and amorphous phase characteristics of concrete containing coconut shell ash as a partial cement substitution at replacement levels of 0%, 1.25%, 2.5%, 3.75%, 5%, and 6.25% using the X-Ray Diffraction (XRD) method. Furthermore, the XRD results were correlated with the compressive strength of concrete to evaluate the influence of microstructural changes on its mechanical properties. The research began with the selection and cutting of concrete specimens, followed by X-Ray Diffraction (XRD) testing to obtain diffraction patterns. The diffraction data were subsequently processed using Origin 2018 software to determine the proportions of crystalline and amorphous phases and to evaluate the microstructural characteristics of concrete containing coconut shell ash. The results indicated that coconut shell ash possesses pozzolanic properties that meet the requirements of Class N, making it suitable as a partial cement replacement material. The compressive strength test showed that the 2.5% substitution level produced the highest compressive strength of 26.80 MPa. However, increasing the substitution level beyond this percentage resulted in a gradual reduction in compressive strength. The XRD analysis revealed that all concrete mixtures were predominantly composed of the amorphous phase, ranging from 97.87% to 98.99%, while the crystalline phase ranged from 1.01% to 2.13%. Based on these findings, it can be concluded that the 2.5% coconut shell ash substitution is the optimum mixture because it provides the most favorable amorphous phase composition and the highest compressive strength.

Item Type:	Thesis (Skripsi)
Additional Information:	Pembimbing : 1. Ir. Revisdah, M.T 2. Dr. Verinazul Septriansyah, S.T.,M.T
Uncontrolled Keywords:	Beton, Abu Tempurung Kelapa, XRD, Origin 2018. Concrete, Coconut Shell Ash, X-Ray Diffraction (XRD), Origin 2018.
Subjects:	Teknik Sipil > Bahan-bahan Bangunan
Divisions:	Fakultas Teknik > Teknik Sipil (S1)
Depositing User:	Mahasiswa Fakultas Teknik
Date Deposited:	10 Sep 2026 03:24
Last Modified:	10 Sep 2026 03:24
URI:	http://repository.um-palembang.ac.id/id/eprint/37341

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