Abstract
The strength of geopolymer depends on the nature of source materials. For example, geopolymer produced with calcined source material such as calcined kaolin, fly ash, ground granulated blastfurnace slag (GGBS) and others produce a higher compressive strength compared to geopolymer produced with non-calcined source material such as kaolin. This paper studied the effect of various ratios of Na2SiO3/NaOH ratio, kaolin/alkaline activator ratio and sand/kaolin ratio to the strength of clay - based geopolymer brick. The samples had been tested to determine their compressive strength, density, and water absorption properties. Compression tests were conducted at seventh day of testing of all specimens. Tests were carried out on standard size of geopolymer brick according to British Standard (BS 3921).
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