A non-ferrous non-reactive precast shoreline restoration and retention solution may include at least one generally hexagonal structure including a body having a first end opposite a second end. The body may define a passage from the first end to the second end and at least one aperture defined in the side or sides of the body. The at least one aperture may be constructed and arranged to allow fluid flow through the passage of the at least one generally hexagonal structure. In this way, at least one or a plurality of non-ferrous non-reactive precast shoreline restoration solution may reduce erosion of shoreline and reef by functioning as a wave break in an aquatic operating environment.

Man-made boulders anchored to a grade beam to prevent erosion of a bulkhead. The boulders are fabricated using woven bags filled with concrete and located on the water side of the bulkhead. An anchor bolt is embedded in the top surface of the boulder concrete. A concrete grade beam equipped with anchor bolts is located on the land side of the bulkhead. Cables are threaded between the anchor bolts of the concrete boulders and the anchor bolts of the grade beam. The weight of the concrete boulders plus the tensioned cables provide a structure that resists movement and protects the bulkhead from deterioration due to wave action. If upgrade soil protection is needed, rock-filled gabion cages can be installed over the grade beam.

A structural barrier and energy absorbing device comprises a plurality of structural elements. The structural element alone or in a plurality may serve as a traversal impediment or energy absorbing device, such as a pedestrian barrier, vehicular barrier, anti-tank obstacle, ballistic barrier, or the like. The structural element may be a tetrapod such that it comprises an element body having four extension portions that extend outwardly from the interior center to a distal end, such that the structural element maintains an identical orientation and a low center of gravity in each of four resting positions. The structural element may be a solid-state structural element comprised of a particular material or a portable and collapsible structural element wherein the element body comprises an outer skin defining an interior void space, such that during set-up or installation the interior void space may be filled with a filler substance onsite.

A device designed to stabilize a shoreline which helps to prevent erosion, provides and supports a place for aquatic life to thrive, and is made from a plurality of primarily calcium carbonate material sourced from living creatures and is cemented together using a commercially available cement or bio-cement material.

The invention provides a marine infrastructure unit having a polyhedral structure with at least four faces; wherein said unit is formed of concrete and wherein at least one face of said unit comprises at least one tidal pool indentation; for use in building a marine infrastructure and promoting fauna and flora growth in marine environment.

A concrete-based composite material including iron rich particles is characterized by an iron content greater than 17% by weight of the composite material, can include iron particles which are an iron by-product recovered from iron slag material, can include iron rich particles which have an iron content of at least 60% by weight of the iron rich particles, and/or can include iron particles having a particle size distribution in the range of about −⅜ inch to +60 mesh or in the range of about −20 mesh to about +60 mesh. The composite material can include ground granulated blast furnace slag as a portion of the cementitious component of the composite material. A method of forming a structural element from the composite material includes casting the structural element such that the structural element is characterized by a ballistic performance of Level 10 as defined by Underwriters Laboratories standard UL752.

A structural barrier and energy absorbing device comprises a plurality of structural elements. The structural element alone or in a plurality may serve as a traversal impediment or energy absorbing device, such as a pedestrian barrier, vehicular barrier, anti-tank obstacle, ballistic barrier, or the like. The structural element may be a tetrapod such that it comprises an element body having four extension portions that extend outwardly from the interior center to a distal end, such that the structural element maintains an identical orientation and a low center of gravity in each of four resting positions. The structural element may be a solid-state structural element comprised of a particular material or a portable and collapsible structural element wherein the element body comprises an outer skin defining an interior void space, such that during set-up or installation the interior void space may be filled with a filler substance onsite.

Disclosed is a crest element in an armor layer assembly of a breakwater. The crest element includes: a central part; two wings extending from the central part in opposing directions along, when placed on a breakwater, the length direction of the breakwater; and a nose extending from the central part in a forward direction transverse to the length direction of the breakwater. The backside of the central part is a vertically oriented, back face facing in a backward direction opposite to the forward direction. The crest element may in particular be used as crest element for armor layers including armor elements of the type having a central part from which: two wings extend in opposing directions, and a tail and nose extend in opposing directions transverse to the direction of extension of the wings. Also disclosed is an armor layer, a breakwater and methods using the crest elements.

A structural barrier and energy absorbing device comprises a plurality of structural elements. The structural element alone or in a plurality may serve as a traversal impediment or energy absorbing device, such as a pedestrian barrier, vehicular barrier, anti-tank obstacle, ballistic barrier, or the like. The structural element may be a tetrapod such that it comprises an element body having four extension portions that extend outwardly from the interior center to a distal end, such that the structural element maintains an identical orientation and a low center of gravity in each of four resting positions. The structural element may be a solid-state structural element comprised of a particular material or a portable and collapsible structural element wherein the element body comprises an outer skin defining an interior void space, such that during set-up or installation the interior void space may be filled with a filler substance onsite.

A seawall section includes a central hub having an axis extending in a longitudinal direction and three circumferentially spaced walls extending radially from the central hub. Each of the walls is made of cast concrete reinforced with a rebar cage having a plurality of longitudinally spaced pairs of parallel rebars extending radially from the central hub to an end rebar that extends perpendicularly relative to the parallel rebars. Each end rebar is connected to radially outer ends of one of the pairs of parallel rebars. A seawall comprises a plurality of the seawall sections connected together end-to-end with a cable, and connecting plates fastened to adjacent sections. A form for manufacturing the seawall section encloses connected rebars and is filled with concrete.