CORE-LOC Concrete Armoring
CORE-LOC is an innovative coastal structure protection armor unit designed to
withstand the harshest of wave climates. Its unique shape provides a strong interlocking
unit optimized for high stability and low cost.
Its superior hydraulic stability is attributed to
the extraordinary interlocking of its
symmetrically tapered octagonal members. This
product is the result of years of concrete armor
research within the Coastal Structures Group at
the Coastal and Hydraulics Laboratory (CHL),
CORE-LOC has become the concrete unit of
choice for both new construction and repair of
existing concrete-armored slopes because of its extraordinary efficiency. Advantages are
that it dissipates the maximum amount of wave energy with the least amount of concrete,
requiring significantly less materials; its layer has a reserve stability when properly
designed and constructed; it is placed in a single layer, unlike many other types of concrete
armor units which are placed in two layers. Keeping in mind that the cost of an armor layer
is proportional to the total volume of concrete on the slope, CORE-LOC has one of the
lowest packing densities in the industry, which brings about significant reduction in on-
slope concrete volume. Together these factors account for as much as 50 percent cost-
savings over many other popular concrete armor units.
CORE-LOC armor layers have been designed for hundreds of structures and over 30
have been constructed to-date. The first CORE-LOC project was constructed in 1996 in
Port St. Francis, South Africa with 800 15-ton CORE-LOC units. This site has endured
three design level storms with excellent performance and no resultant damage. Patents
and/or trademarks for CORE-LOC have been granted in more than 45 countries. The
technology has been regionally licensed worldwide to several firms.
Gordon K. Prestedge (Prestedge, Retief, Dresner, Wijnberg) Marina Center, can be
reached at Commercial Phone: 27-21-418-3830, West Quay Road, Victoria and Alfred
Waterfront, Cape Town, South Africa, P.O. Box 50023, Waterfront 8002, e-mail:
Minoru Hanzawa, can be reached at Commercial Phone: +81-29-
831-741, Manager, Planning Section, TETRA Technical Research Institute, TETRA Co.,
Ltd., 2-7 Higashi Nakanuki, Tsuchiura, Ibaraki, 300-0006, Japan.
Core-Loc International (CLI) (http://www.coreloc.com) can be reached at Commercial
Phone: 33 0 2 47 74 18 10, Michel Denechere, 3 cour du 56, av. Marcel Dassault, 37200
Tours, France, e-mail, firstname.lastname@example.org.
Over 30 structures have been constructed. A list is available at the Web site
Point of Contact
Stephen Collinsworth, U.S. Army Corps of Engineer, ATTN: CESAM-EN-EN, PO Box
2288, Mobile, AL; 36628-0001; e-mail: .
U.S. Army Engineer Research and Development Center