Analisis Pengaruh Penambahan dan Persen Berat Agregat Adiktif Terhadap Thermal Shock dan Mechanical Properties pada Refraktori High Alumina di Industri Semen

Setioko, Fausta Romanova (2026) Analisis Pengaruh Penambahan dan Persen Berat Agregat Adiktif Terhadap Thermal Shock dan Mechanical Properties pada Refraktori High Alumina di Industri Semen. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Refraktori high alumina banyak digunakan pada industri semen karena memiliki ketahanan terhadap suhu tinggi dan stabilitas kimia yang baik. Namun, kondisi operasi kiln yang mengalami perubahan temperatur secara cepat dapat menyebabkan thermal shock yang memicu terbentuknya retakan mikro sehingga menurunkan sifat mekanik dan umur pakai material. Penelitian ini bertujuan untuk menganalisis pengaruh jenis dan persentase penambahan agregat aditif terhadap sifat fisik, sifat mekanik, dan ketahanan thermal shock refraktori high alumina. Agregat aditif yang digunakan meliputi bauksit, tabular alumina, calcined alumina, dan andalusite dengan variasi penambahan sebesar 2% dan 4% berat. Proses pembuatan spesimen meliputi pencampuran bahan baku, pembentukan menggunakan metode dry pressing, pengeringan, dan sintering pada temperatur tinggi. Pengujian yang dilakukan meliputi densitas, porositas semu, penyerapan air, Cold Crushing Strength (CCS), Modulus of Rupture (MOR), serta pengujian thermal shock yang dievaluasi melalui perubahan nilai CCS dan MOR setelah siklus thermal shock. Hasil penelitian menunjukkan bahwa jenis agregat aditif memberikan pengaruh yang berbeda terhadap seluruh sifat fisik dan mekanik refraktori akibat perbedaan kontribusi terhadap pembentukan fasa, proses densifikasi, dan kekuatan material. Persentase penambahan agregat juga berpengaruh, namun tidak menunjukkan hubungan yang linier pada setiap jenis agregat. Variasi tabular alumina 4% menghasilkan kombinasi sifat fisik dan mekanik paling optimal dengan densitas 2,190 g/cm³, porositas semu 6,22%, penyerapan air 2,61%, serta nilai CCS setelah thermal shock sebesar 39,031 MPa. Sementara itu, variasi andalusite 2% menunjukkan ketahanan thermal shock terbaik berdasarkan nilai CCS setelah thermal shock sebesar 40,658 MPa. Hasil penelitian menunjukkan bahwa pemilihan jenis dan persentase agregat aditif yang tepat berperan penting dalam meningkatkan performa refraktori high alumina untuk aplikasi pada industri semen.
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High alumina refractory is widely used in the cement industry because it has high temperature resistance and good chemical stability. However, the operating conditions of the kiln that undergo rapid temperature changes can cause thermal shock that triggers the formation of micro-cracks thereby reducing the mechanical properties and service life of the material. This study aims to analyze the effect of the type and percentage of additive aggregate addition on the physical properties, mechanical properties, and thermal shock resistance of high alumina refractory. The additive aggregates used include bauxite, tabular alumina, calcined alumina, and andalusite with variations of addition of 2% and 4% weight. The specimen manufacturing process includes mixing raw materials, forming using dry pressing, drying, and sintering methods at high temperatures. The tests carried out include density, pseudo porosity, water absorption, Cold Crushing Strength (CCS), Modulus of Rupture (MOR), and thermal shock testing which is evaluated through changes in CCS and MOR values after the thermal shock cycle. The results showed that the type of additive aggregate exerts a different influence on the entire physical and mechanical properties of the refractory due to the difference in contribution to phase formation, densification process, and material strength. The percentage of aggregate addition also has an effect, but it does not show a linear relationship for each type of aggregate. The 4% tabular variation of alumina yielded the most optimal combination of physical and mechanical properties with a density of 2,190 g/cm³, apparent porosity of 6.22%, water absorption of 2.61%, and a CCS value after thermal shock of 39,031 MPa. Meanwhile, the 2% andalusite variation showed the best thermal shock resistance based on the CCS value after thermal shock of 40.658 MPa. The results show that the selection of the right type and percentage of additive aggregates plays an important role in improving the performance of high alumina refractory for applications in the cement industry.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Refractory brick high alumina, Thermal shock, Mechanical properties, Bauxite, Tabular alumina, Calcined alumina, Andalusite
Subjects:	T Technology > TN Mining engineering. Metallurgy > TN687 Electric furnaces. T Technology > TN Mining engineering. Metallurgy > TN688 Hydrometallurgy T Technology > TN Mining engineering. Metallurgy > TN689+ Physical metallurgy
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User:	Fausta Romanova Setioko
Date Deposited:	27 Jul 2026 04:11
Last Modified:	27 Jul 2026 04:11
URI:	http://repository.its.ac.id/id/eprint/137486

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