ANALISIS PENGARUH KOMPOSISI CAMPURAN BAHAN TERHADAP KARAKTERISTIK FISIKO-MEKANIS AGREGAT RINGAN BUATAN DENGAN METODE SINTERING
Keywords:
Artificial lightweight aggregates, Variation of composition, Physical Properties, Mechanical PropertiesAbstract
Lightweight aggregate is well-known due to its low density, porous structure, and fire resistance. Numerous studies have been conducted to develop artificial lightweight aggregates with specific characteristics, such as high compressive strength and porosity, while maintaining low water absorption and density, depending on the applications. Artificial lightweight aggregates are formed from materials containing SiO?, Al?O?, and Fe?O?, with additional compounds like carbonates that release gas during heating, resulting in a porous structure. Each compound plays a specific role in determining the characteristics of the resulting aggregate. Therefore, this study explores the variations in composition during the synthesis of lightweight aggregates by mixing castable refractory waste as a source of Al?O?, sand as a source of SiO? and Fe?O?, and dolomite as a source of MgO and CaCO?. The synthesis was carried out using a sintering method at 1200°C to examine the effect on the physical and mechanical properties. Lightweight aggregates were successfully synthesized, and all variations exhibited a density of less than 1.2 g/cm³. A significant correlation was found between the contents of SiO?, Al?O?, and CaCO? and the aggregate’s density, compressive strength, and water absorption. Sample C54, with a high content of castable refractory waste, showed the most favorable properties, with a low density of 0.68 g/cm³, high compressive strength of 16.10 MPa, and low water absorption of 7.2%.
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