Synthesis and Characterization of White Mineral Trioxide Aggregate Using Precipitated Calcium Carbonate Extracted from Limestone

Abstract:

White Mineral Trioxide Aggregate (WMTA) using precipitated CaCO₃ (PCC) from limestone has been synthesized. PCC in calcite structure was extracted from limestone by calcination at 900 °C for 3 h, dissolved in 0.8 M nitric acid solution and followed with carbonation for 60 minutes. PCC was used for the synthesis of WMTA by mixing with tetraethoxyorthosilicate, bismuth oxide, aluminum oxide, catalyst of with HNO₃ and NH₃ solution and thermally treated at 1100 °C for 3 h. The products were characterized with Thermal Gravimetric Analysis-Differential Thermal Analysis (TGA-DTG), X-ray Diffraction (XRD), Frontier-Transform Infrared (FTIR) spectroscopy, Scanning Electron Microscopy (SEM) and X-ray Fluorescence (XRF). The results showed that the PCC dominated calcite structure was obtained with 75.25% in yield and 99.42% in purity. The WMTA has been successfully synthesized by low thermal treatment at 1100 °C using catalysts of HNO₃ and NH₃ solution, proven by the presence of tricalcium silicate (C₃S), dicalcium silicate (C₂S), tricalcium aluminate (C₃A), and Bi₂O₃ in WMTA.

• Periodical: Key Engineering Materials (Volume 840)
• Pages: 330-335
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.840.330
• Online since: April 2020
• Authors: Maulidia Fa'izzah, Widjijono Widjijono, Yuichi Kamiya, Nuryono Nuryono*
• Keywords: CaCO₃, Limestone, White Mineral Trioxide Aggregate (WMTA)

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