Cementitious composite constituent relationships

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

• a first layer;
• a second layer spaced from the first layer;
• a cementitious mixture disposed between the first layer and the second layer, the cementitious mixture including cementitious materials, wherein the cementitious mixture is of a nonexpansive type;
• and
• a structure layer disposed between the first layer and the second layer, wherein the cementitious mixture is disposed within the structure layer;
• wherein the cementitious mixture is configured to absorb a mass of water;
• and
• wherein:
• Mw=x·Mc
• where:
• Mw is the mass of water per unit area of the cementitious composite;
• Mc is a mass of cementitious materials of the cementitious mixture per unit area of the cementitious composite;
• and
• x is a ratio of the mass of water relative to the mass of cementitious materials of the cementitious mixture per unit area of the cementitious composite that provides a maximum 28 day compressive strength of the cementitious composite, wherein x is between 0.25 and 0.55.

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

• a first layer;
• a second layer spaced from the first layer;
• a cementitious mixture disposed between the first layer and the second layer, the cementitious mixture including cementitious materials, wherein the cementitious materials are shaped and arranged to provide a void fraction of between 0.30 and 0.64 to facilitate high pressure hydration, wherein the void fraction is defined as a ratio of a volume of voids within the cementitious mixture per unit area of the cementitious composite to a volume of cementitious materials per unit area of the cementitious composite;
• and
• a structure layer disposed between the first layer and the second layer, wherein the cementitious mixture is disposed within the structure layer;
• wherein the cementitious mixture is configured to absorb a mass of water;
• and
• wherein:
• Mw=x·Mc
• where:
• Mw is the mass of water per unit area of the cementitious composite;
• Mc is a mass of cementitious materials of the cementitious mixture per unit area of the cementitious composite;
• and
• x is a ratio of the mass of water relative to the mass of cementitious materials of the cementitious mixture per unit area of the cementitious composite that provides a maximum 28 day compressive strength of the cementitious composite, wherein x is between 0.25 and 0.55.