Alkali silicate-polyisocyanate composites

A process for preparing alkali silicate—polyisocyanate composites comprising the steps of:

• a) mixing a catalyst with a polyisocyanate to form a first component, wherein said first component has a pH of at least 7.5;
• b) mixing an alkali silicate with water to form a second component;
• and
• c) mixing the first and second component to form a reactive mixture that reacts to form a hardened composite,
• wherein said reactive mixture and said hardened composite are homogeneous, and wherein the catalyst comprises 2,2′-dimorpholinodiethylether.

A process for filling a void volume comprising the steps of:

• a) mixing a catalyst with a polyisocyanate to form a first component, wherein said first component has a pH of at least 7.5;
• b) mixing an alkali silicate with water to form a second component;
• c) mixing the first and second component to form a reactive mixture;
• and
• d) introducing the reactive mixture into at least one of said void volumes, and allowing the reactive mixture to react to form a hardened composite,
• wherein the catalyst comprises 2,2′-dimorpholinodiethylether.

An alkali silicate—polyisocyanate composite that is prepared by:

• a) mixing a catalyst with a polyisocyanate to form a first component, wherein said first component has a pH of at least 7.5;
• b) mixing an alkali silicate with water to form a second component;
• and
• c) mixing the first and second component to form a reactive mixture that reacts to form a hardened composite,
• wherein the catalyst comprises 2,2′-dimorpholinodiethylether.