Methods and matrices for promoting fauna and flora growth

A method of promoting the growth of fauna and flora in aquatic environment comprising providing a marine construction infrastructure comprising a concrete matrix, the concrete matrix comprising

• at least one type of cement,
• at least one aggregate comprising fine graded sand less than 4.75 mm, natural or crashed aggregates less than 0-2 mm, or any combination thereof, and
• potable water not containing more than 1000 parts per million of chloride or sulfates and free from lead, copper, zinc (<5 ppm) or phosphate (<5 ppm), the concrete matrix having a pH of less than 12 for use in promoting the growth of fauna and flora in aquatic environment,
• wherein:
• said concrete matrix has an average compressive strength of between 30 to 80 Mpa, water penetration depth under 7 bar of between 5 to 50 mm and chloride penetration resistance of between 500 to 2000 Coulombs.