Role of the silica source on the geopolymerization rate

► The increase of amorphous silica in the mixture favors the polycondensation reaction. ► Quartz source leads to a lack of silica inducing a non consolidated material. ► The mechanical properties increase with the amount of amorphous silica. ► Si/Al and mechanical properties decrease with quartz sand addition. ► For Si/Al constant, the quartz sand addition increases the mechanical properties.