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Scientific Approach of Geopolymer Concrete Composites using Marginal Materials

Geopolymer concrete is a sustainable composite where concrete is supplanted totally by pozzolanic cementitious materials like coal fuel ash, granulated blast furnace slag, rice husk ash, metakioline etc. with binding alkaline solutions in the matrix. Since the geopolymer doesn’t have specific code determination, a study has been made to create mix design to achieve the required workability and fresh density as per the considerable limits. Mix design procedure is proposed for flyash rice husk ash composition considering the quantity and fineness of binder, grading of aggregates. Water glass solution with Na2O = 18.79 %, SiO2 = 34.21 % and H2O = 47 % and solution of sodium hydroxide having 10M and 12M concentration were maintained constant throughout the Design. Fluid to binder ratio of 0.56, sodium silicate-to-sodium hydroxide ratio of 2.5 by mass was fixed on the basis of flowability. Measurement of Workability of geopolymer concrete was done using slump cone apparatus as per IS 1199. The cubes of 100 mm size were casted and cured under sundried condition maintaining a temperature about 40°C. From the observation it is concluded that the brick industrial rice husk ash can be utilized upto 10% in class f flyash to satisfy the Mix design criteria.