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This block also offered a range of colors beyond the typical grey concrete, again to lower cost and simplify retaining wall construction. Some featured score lines carved into the split face. The original split face was broken to look like rough stone. This allows the block to be used both as a decorative and a structural unit, eliminating the additional expense of applying veneers. This is a standard concrete block that is manufactured with an attractive texture on one side. Block provides outstanding structural reinforcement often required by architects and structural engineers for walls over about four feet in height. Therefore they are usually covered with an attractive veneer of stone, brick or decorative masonry units. Retaining walls made of standard block can stand alone, but they offer little aesthetic value. There can also be slots formed into the block that allow rebar to run horizontally in the wall as well. Standard reinforcing bar, "rebar" is integrated into the cells to unify the wall vertically as well as extending into the foundation. The cells are vital to its stability and should be filled with concrete or "grouted solid" when the wall is complete. This block measures 8" x 8" x 16" and features two identical openings or cells. Three basic types of block used for raised planters and retaining wall structures: Standard Concrete Block (CMU) Over the years block has evolved from the simple two cell rectangular unit often called "cinder block" to much more elaborate and attractive split face. Widely available and easy to work with, these concrete masonry units provide both aesthetic value and powerful structural integrity. These walls are constructed of units that fit together accurately to increase overall strength and eliminate the need for a block core.Ĭoncrete block has always been the most important component in retaining walls.

Interlocking Retaining Wall Systems (PDF)