Luminous cementitious composition and methods of making and using the same

An alkaline earth metal aluminate powder comprising a plurality of micro-capsules of an alkaline earth metal aluminate encapsulated in a light-transmitting resin, glass or combination thereof, wherein the micro-capsules range in size from about 0.7 μm and about 200 μm and wherein less than about 30% of the encapsuated aluminate is fractured.

A method of making an alkaline earth metal aluminate powder, the method comprising cooling an alkaline earth metal aluminate encapsulated in a light-transmitting, resin, glass or combination thereof to a temperate of about −250° F. to about −350° F.;

• and rendering the encapsulated aluminate into a powder comprising micro-capsules of the alkaline eh metal aluminate encapsulated in the light-transmitting resin, light-transmitting glass or combination thereof, the micro-capsules ranging in size from about 0.7 μm to about 200 μm, wherein less than about 30% of the encapsulated aluvinate is fractured.

A method of making a luminous composition, the method comprising cooling an alkaline earth metal aluminate encapsulated in a light-transmitting resin, light-transmitting glass or combination thereof to a temperature of about −250° F. to about −350° F.;

• rendering the encapsulated alkaline earth metal aluminate into a powder comprising micro-capsules comprising the alkaline earth metal aluminate encapsulated in the light-transmitting, resin, light-transmitting glass or combination thereof, the micro-capsules ranging in size from about 0.7 μm to about 200 μm;
• and
• combining the aluminate powder with hydraulic cement, a polymer, and limestone to produce a luminous composition.