Cementitious materials including a luminescent compound for printing 3-dimensional structures

A method of printing a luminescent 3-dimensional object, the method comprising the steps of:

• mixing a dry cementitious composition comprising, relative to a total dry weight of the composition:
• 15 to 40 wt % of cement;
• 3 to 7 wt % of at least one of calcium aluminate cement and calcium sulfoaluminate cement;
• 0 to 35 wt % of at least one of slag and calcined clay;
• 4 to 12 wt % of one or more luminescent compounds;
• 5 to 60 wt % of at least one of aggregates and fillers;
• and
• 1 to 2 wt % of further additives including calcium carbonate;
• controlling a ratio of a total amount of the one or more luminescent compounds to an amount of the calcium carbonate in the mixture to be in a range of 0.41 to 0.81;
• conveying the mixture to a print head;
• applying the conveyed mixture from the print head to form a luminescent 3-dimensional object;
• and
• curing the luminescent 3-dimensional object,
• wherein the one or more luminescent compounds includes a first luminescent compound having a first average particle diameter, and a second luminescent compound having a second average particle diameter smaller than the first average particle diameter,
• wherein the first average particle diameter is greater than 1 mm, and the second average particle diameter is 1 mm or less, and
• wherein a ratio of an amount of the first luminescent compound to an amount of the second luminescent compound in the dry cementitious composition is in a range of 1:3 to 3:1.