Geopolymer mortar compressed blocks were prepared using fly ash, ground granulated blast furnace slag, silica fume
and metakaolin as binders and sand/quarry dust/pond ash as fine aggregate. Alkaline solution was used to activate the source
materials for synthesizing the geopolymer mortar. Fresh mortar was used to obtain the compressed blocks. The strength development
with reference to different parameters was studied. The different parameters considered were fineness of fly ash, binder
components, type of fine aggregate, molarity of alkaline solution, age of specimen, fluid-to-binder ratio, binder-to-aggregate ratio,
degree of saturation, etc. The compressed blocks were tested for compression at different ages. It was observed that some of the
blocks attained considerable strength within 24 h under ambient conditions. The cardinal aim was to analyze the experimental data
generated to formulate a phenomenological model to arrive at the combinations of the ingredients to produce geopolymer blocks to
meet the strength development desired at the specified age. The strength data was analyzed within the framework of generalized
Abrams’ law. It was interesting to note that the law was applicable to the analysis of strength development of partially saturated
compressed blocks when the degree of saturation was maintained constant. The validity of phenomenological model was examined
with an independent set of experimental data. The blocks can replace the traditional masonry blocks with many advantages.