Daytime Radiative Cooling Cementitious Composite (DRCCC)

A Daytime Radiative Cooling Cementitious composite (DRCCC) comprising:

• an Ordinary Portland Cement (OPC) binder in the form of grains, with an amount of Fe2O3 lower than 0.05% by weight with respect to the total weight of the OPC binder, wherein the grain size is below 25 μm,
• water, wherein the weight ratio between water and the OPC binder is between 0.2 to 0.6, and
• an addition in a proportion between 0.1% and 50% by weight with respect to the weight of the OPC binder, wherein the addition is selected from:
• titanium dioxide particles, calcium carbonate particles, or both, of sizes between 10 nm and 20 μm,
• hollow inorganic capsules of sizes between 10 nm and 50 μm and wall thickness below 10 μm,
• hollow organic capsules of sizes between 10 nm and 50 μm and wall thickness below 10 μm, or
• microencapsulated Phase Change Materials (MPCM) wherein a Phase Change Material is inside of inorganic or organic capsules of sizes below 50 μm and wall thicknesses below 1 μm;
• and wherein the resulting DRCCC has a pore size below 6 μm as defined by mercury intrusion porosimetry.