In spite of silica fume (SF) can be incorporated into different geopolymer types as a part of precursor, as a part of activator or as a foaming agent, most of the earlier studies employed SF as a part of cementitious material (as a part of precursor or an additive) (~ 74.1%), whilst employing it as a part of activator came in the second place (14.81%). Finally, employing SF as a foaming agent came in the last place (11.11%). In this part, the percentage of studies about the effect of SF as a part of precursor on each property of geopolymers was established and compared. The effect of SF in its three forms (part of precursor, part of activator and foaming agent) on the various geopolymer types was summarized.
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