Foaming agents in their study produced lightweight geopolymers


Hardjito et al. stated that the F class of fly ash as the starting material was suitable for a geopolymer synthesis. Still, in this research, the fly ash used was classified as class C with a high content of CaO (more than 8% weightage). Several studies have indicated using geopolymer as lightweight non-concrete, as conducted by Posi et al., where the synthesized lightweight geopolymer contained an aggregate recycle lightweight block with a density and compressive strength of 1400 kg/m3 and 16 MPa, respectively. Another study by Abdullah et al. explained that using foaming agents in their study produced lightweight geopolymers with a mechanical compressive strength of 18.19 MPa. According to the Indonesian National Standard (SNI-03-3449-2002), the minimum compressive strength of lightweight concrete was 17.24 MPa, with the highest density of about 1850 kg/m3. Since the compressive strength of lightweight geopolymers obtained in previous studies was low, this study aims to improve the characteristics of lightweight geopolymers as non-cement lightweight concrete by adding a foaming agent and aluminum powder as the pore-forming agent. The fly ash of class C from Paiton Power Plant was used in this experiment as a raw aluminosilicate source. This material's chemical composition is measured by X-Ray Fluorescence (XRF). An alkali activator solution was prepared by mixing the 7M sodium hydroxide (NaOH pellet, technical grade) solution with sodium silicate solution (Na2SiO3, technical grade). The dissolution of sodium hydroxide is an exothermic reaction; thus, the solution was cooled for 24 hours before mixing with sodium silicate. If you are looking for high quality, high purity, and cost-effective Cement foaming agent, or if you require the latest price of Cement foaming agent, please feel free to email contact mis-asia.

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