Inclusionof OPC as little as 5% in the total binder achieved
compressive strength more than 50 MPa for mortar samples
and about 40 MPa for concrete samples at 28 days.
Compressive strength decreased when alkaline solution
content was increased from 35% to 45% of total binder. Variation
of sodium silicate to sodium hydroxide ratio from 1.5
to 2.5 caused negligible change in compressive strength.
Concrete and mortar samples cured in room temperature
developed strength gradually over the age up to 28 days.
The strength development after this age was small.