Spacer for reinforcements

A spacer for positioning a reinforcement relative to a mold form into which liquid concrete will be poured and allowed to harden about said spacer and said reinforcement, said spacer comprising:

• a body comprised of a plurality of quartz grains interbonded and cured in place in a polymer concrete and having an exposed surface,
• said exposed surface resulting from a predetermined amount of the cured polymer concrete having been removed from said body in an amount such that exposed portions of said grains project from said exposed surface and such that randomly positioned craters are formed in said surface to form areas of chemical and mechanical attachment for the poured concrete.

A spacer for a reinforcement and adapted to be embedded into a mass of cementitious material, said spacer comprising

• a body made of polymer concrete consisting of a cured plastic material having aggregates in the form of grains dispersed generally uniformly throughout said material,
• a predetermined surface of said body being characterized by a portion of said cured plastic material having been removed in place from said body to expose at least some of said grains and form craters to interlock with said cementitious material and to form a moisture sealed bond therewith, said exposed grains projecting in part from said predetermined surface of said cured plastic material and said craters extending into said predetermined surface.

A spacer for positioning a reinforcement relative to a mold form into which liquid concrete will be poured and allowed to harden about the spacer and the reinforcement, said spacer comprising

• a body comprised of a plurality of quartz grains interbonded and cured in place in a polymer concrete and having a generally smooth exterior surface,
• said grains being relatively uniformly dispersed in said polymer concrete and disposed below the exterior surface of said body, and
• a portion of said exterior surface having been post-treated by removal of a predetermined amount of said cured polymer concrete in such a way as to form a nonsmooth surface and to expose portions of at least some of said grains, said exposed portions of said grains projecting from said nonsmooth surface to form areas of chemical attachment to the poured liquid concrete.

A spacer for ensuring accurate positioning of a reinforcement within a form into which liquid concrete will be poured and allowed to harden whereby the reinforcement will be at a predetermined distance for the exterior surface of the concrete element produced in said form, said spacer comprising

• a body made of polymer concrete consisting of a cured plastic material having aggregates in the form of grains integrated in and dispersed throughout said plastic material, said resulting body having a generally smooth surface consisting of cured plastic material and said grains comprising fractured quartz,
• a predetermined surface of said body being post-treated by removal of cured plastic material from said smooth surface in such a way that exposed portions of random ones of said grains project from the predetermined surface of said cured plastic material, said exposed projecting grains allowing a chemical attachment with the liquid concrete.