A composite material, bonding light weight aggregates with the alkali metal silicates such as those of sodium and potassium and alkaline earth metal silicates such as those of magnesium and calcium, having a mean weight ratio of silica to alkali metal oxide or alkaline earth metal oxide of 4:1 to 1:1 with varying densities, either as soluble glass, powder, solution, and/or clay loaded solutions produces bonding of a variety of aggregates from fine to large aggregates, either separately or in a variety of combinations of both aggregate sizes and materials, wholly or partly substituting cement and/or lime as the bonding agent. The aggregates may be mixed dry in a mechanical mixer to which the desired quantities of silicate/s and water are added together with fluorosilicate if required. The material can be cast into moulds and may be vibrated or compressed, or alternatively extruded. The material can, when sufficiently set, be kiln, or autoclave cured.
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