Production and Application of Olivine Nano-Silica in Concrete

5th International Conference on Nanomaterials and Materials Engineering

Mardiana, Oesman^1 ; Haryadi^2

Civil Engineering Department of Politeknik Negeri Bandung, Indonesia^1

Chemical Engineering Department of Politeknik Negeri Bandung, Indonesia^2

关键词: Acid concentrations;    Amorphous silica;    Fourier transform infrared;    Heating temperatures;    Micro-particles;    Olivine rocks;    Silica particles;    Weight ratios;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/204/1/012008/pdf
DOI  :  10.1088/1757-899X/204/1/012008

来源: IOP

【 摘 要 】

The aim of this research was to produce nano silica by synthesis of nano silica through extraction and dissolution of ground olivine rock, and applied the nano silica in the design concrete mix. The producing process of amorphous silica used sulfuric acid as the dissolution reagent. The separation of ground olivine rock occurred when the rock was heated in a batch reactor containing sulfuric acid. The results showed that the optimum mole ratio of olivine- acid was 1: 8 wherein the weight ratio of the highest nano silica generated. The heating temperature and acid concentration influenced the mass of silica produced, that was at temperature of 90 °C and 3 M acid giving the highest yield of 44.90%. Characterization using Fourier Transform Infrared (FTIR ) concluded that amorphous silica at a wavenumber of 1089 cm-1indicated the presence of siloxane, Si-O-Si, stretching bond. Characterization using Scanning Electron Microscope - Energy Dispersive Spectroscopy (SEM-EDS) showed the surface and the size of the silica particles. The average size of silica particles was between 1-10 μm due to the rapid aggregation of the growing particles of nano silica into microparticles, caused of the pH control was not fully achieved.