Geosynthsesis binder comprising a calcium- alkaline activator and a silico-aluminous compound

A dry geosynthetic binder dry composition resulting from a mineral polycondensation caused by an alkali-activated reaction comprising at least:

• an alkalino-calcium activator in dry form comprising at least lime and an alkaline salt, which can suitably react together so as to form in situ a base in the presence of water, and
• a silico-aluminous compound in dry form selected from blast furnace, comprising, by weight, as compared to the silico-aluminous compound total weight an amount of calcium oxide higher than or equal to 35%, an amount of alumina ranging from 3 to 25% and an amount of silica ranging from 20 to 50%,
• wherein the binder dry composition comprises, by weight, as compared to the total weight, from 45 to 95% of said silico-aluminous compound, from 2 to 25% of lime and from 3 to 30% of an alkaline salt, and
• wherein the geosynthetic binder does not require any thermal activation.