This article describes the crystalline structure of Belite or β-dicalcium silicate (β-C₂S, Ca₂SiO₄), one of the main compounds in Portland cement clinker. Belite is synthesized from lime sludge, a residual solid waste from paper and pulp industry, with nanosilica at relatively low temperature through solid state reaction. The main objective of this study is to predict the theoretical spectra by molecular dynamic analysis and to compare with the experimental frequencies. The best accordance between experimental and calculated wave numbers are obtained for the freshly prepared belite powders. This work presents the experimental results and analytical infrared investigations for the synthesized belite powder particles.

Keywords: β-dicalcium silicate, FTIR, Molecular dynamics, Lime sludge, Nano silica.