Multi-nozzle automated additive spraying and methods of additive spraying to form carbon dioxide-infused fiber-reinforced concrete

An automated spraying device for additive manufacturing, the device comprising:

• a feed system comprising a first supply line configured to deliver fibers, a second supply line configured to deliver a first sprayable cementitious material, a third supply line configured to deliver a second sprayable cementitious material comprising carbon dioxide (CO2);
• and
• an automated spray head that comprises:
• a first nozzle in communication with the first supply line, the first nozzle configured to deliver a first sprayed stream comprising fibers;
• a second nozzle in communication with the second supply line and configured to deliver a second sprayed stream comprising the first sprayable cementitious material;
• and
• a third nozzle in communication with the third supply line and configured to deliver a third sprayed stream comprising the second sprayable cementitious material comprising carbon dioxide (CO2), wherein the automated spraying system is configured to form a cementitious component on a target, the cementitious component has a first region comprising a reinforced cementitious composite material formed from the first sprayed stream comprising fibers from the first nozzle and the second sprayed stream comprising the first sprayable cementitious material and a second distinct region comprising a carbonized cementitious material formed from the third sprayed stream comprising the second sprayable cementitious material comprising carbon dioxide (CO2).