Cementitious composite constituent relationships

A method for manufacturing a cementitious composite for in-situ hydration, the method comprising:

• providing a first layer;
• providing a second layer;
• providing a structure layer comprising a nonwoven material and disposed between the first layer and the second layer;
• and
• disposing a cementitious mixture between the first layer and the second layer, wherein the cementitious mixture is disposed within the structure layer, the cementitious mixture including cementitious materials shaped and arranged to provide a void fraction of between 0.64 and 1.35, wherein the void fraction is defined as the ratio of the volume of the voids within the cementitious mixture per unit area of the cementitious composite to the volume of the cementitious materials per unit area of the cementitious composite;
• wherein the cementitious mixture is configured to absorb a mass of water, and the first layer and the second layer are configured to facilitate the absorption of the mass of water by the cementitious mixture, that provides a maximum 28 day compressive strength of the cementitious composite upon curing, wherein a ratio of the mass of the water relative to a mass of the cementitious materials of the cementitious mixture that provides the maximum 28 day compressive strength is between 0.25 and 0.55.

A cementitious composite for in-situ hydration, comprising:

• a first layer;
• a second layer spaced from the first layer;
• and
• a cementitious mixture disposed between the first layer and the second layer, the cementitious mixture including cementitious materials and super absorbent polymers, the cementitious materials shaped and arranged to provide a void fraction of between 0.30 and 1.35, wherein the void fraction is defined as the ratio of the volume of the voids within the cementitious mixture per unit area of the cementitious composite to the volume of the cementitious materials per unit area of the cementitious composite;
• wherein the cementitious mixture is configured to absorb a mass of water that provides a maximum 28 day compressive strength of the cementitious composite;
• and
• wherein:
• Mw=x·Mc
• where:
• Mw is the mass of the water per unit area of the cementitious composite;
• Mc is a mass of the cementitious materials of the cementitious mixture per unit area of the cementitious composite;
• and
• x is a ratio of the mass of the water relative to the mass of the cementitious materials of the cementitious mixture per unit area of the cementitious composite that provides the maximum 28 day compressive strength of the cementitious composite, wherein x is between 0.25 and 0.55.