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Development of Geo-Polymer based Light Weight Bricks

Rajendra Prasad, Priya G. D. V, nagamalleswara Rao kanidarapu


Light weight geopolymer bricks were developed during this study. The mix was made with lime sodium silicate and fly ash as ingredients. A maximum shrinkage was observed at CaO lime ratio of 1.0. Bulk densities were also lower at the ratio of 1.0. The maximum cold crushing strength (CCS) value was found at the ratio of 0.745. Increase in mix water decreased the strength. Water content of 24% is recommended for better workability with reasonably good properties. The free energy is positive hence reaction favors high temperature curing. The strength is increased with time. The strength reported at 27 days was 21.40 MPa. From the present study 5% CaO and 7% Na2SiO3 composition is recommended for practical purposes as it has porosity 22%, low bulk density 0.983 g/cc and a good strength of 23.5 MPa.

Keywords: Geopolymer bricks, cold crushing strength (CCS), porosity, bulk density

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