EFFECT OF NA2SIO3 ON COMPRESSIVE STRENGTH OF WASTE GLASS REINFORCED METAKAOLINBASED GEOPOLYMER
Keywords:
Geopolymer, waste material, metakaolin, compressive strengthAbstract
In comparison with other construction materials such as aluminium, steel, and lumber,Portland cement provides several advantages in terms of ecology and technology. Thetraditional production process of Portland cement usually generates a large amount of CO2during decomposition; moreover, a great deal of fuel is consumed for the high temperatureprocess. Geopolymer was introduced to compensate in cement- based concrete materialsbecause of its low emission of CO2 and suitable strength. In this study, calcined clay mineralfrom Lampang province was used as a geopolymer-based material. Prior to utilization, theclay was calcined at 700°C for 2 h to ensure a suitable condition for synthesis of themetakaolin phase. An amount of 30 wt% of waste glass was studied as a possibility for thereinforcement phase in the metakaolin- based geopolymer. In addition, 10 M of NaOHsolution and partial NaOH replacement by 30-90 wt% of Na2SiO3 were used as the alkalineactivator. Samples were cured at 60°C for 7 days. Phase investigation, microstructure, andcompressive strength were examined by X-ray diffraction, scanning electron microscope,and universal testing machine, respectively. The results show that the compressive strengthdecreased from 36.83, 14.00, and 20.37 MPa related to the concentration of Na2SiO3 from30, 60, and 90% by weight, respectively. Fourier-transform infrared spectra correspondingwith the compressive strength by transformation of Si-O-Al from substitution intetrahedral sites of Al in the Si site were also investigated. The microstructure revealedthat the samples using 30% waste glass and 30% Na2SiO3 were homogeneous due to thedissolution of metakaolin.
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