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Faced building unit
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Inventors: Brownlee, Robert O.;
Assignee:
Primary Examiner: Perham; Alfred C.
Assistant Examiner:
Attorney, Agent or Firm: Tobin; Donald B.
A cementitious facing material for bonding to either preformed masonry building units or to existing masonry and concrete walls, floors or slabs; comprising a suitable proportioned dry mixture of (1) white Portland cement, (2) washed and screened sand of glass making quality, and (3) paint pigments. These thoroughly mixed dry materials are activated into a moist colored concrete mixture of troweling consistancy by the addition of a wetting agent in the correct proportions of water and polyvinyl acetate resin emulsion (containing approximately 50% of solids). The proportions of water and resin in the wetting agent to be based upon the desired percentage of resin to be retained in the facing material after it has been cured. A coating of bonding material is applied to the face of the preformed masonry unit or to the existing masonry or concrete wall, floor or slab and the facing is applied over the bonding material and bonded to the existing base. The composition, when applied as a facing and allowed to cure, forms a water-resistant, wear resistant, resilient, tough, uniformly colored facing having the appearance of fine grained concrete. |
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DETAILED DESCRIPTION The present invention provides a facing material which has the desirable appearance of fine grain cement and at the same time is water-resistant, wear-resistant, resilient, tough, easy to maintain, and may be firmly applied to the individual brick or block or to the assembled structure.
The present facing composition may be used over a variety of base materials used for building structures, e.
g.
, individual bricks or concrete blocks, or existing masonry and concrete walls, floors and slabs or gypsum board.
The facing composition comprises a suitably proportioned dry mixture of cement, light aggregate and, if desired a coloring agent.
The wetting agent which is used to set and harden the concrete is an aqueous emulsion of polyvinyl acetate (containing 50-65% solids) or some similar polymer agent of one part by volume of polyvinyl acetate and about three to one third parts by volume of water.
The proportions of the water and resin in the wetting agent is chosen to provide a desired percentage of resin retained in the facing composition after it cures.
The wetting agent is mixed with the cement, aggregate and coloring agent in sufficient amounts to provide a mixture of troweling consistency.
Before the facing composition is applied to the base material, a bonding agent may be applied over the base material.
The facing is then applied over the bonding material and bonded to the base material.
The composition, when applied as a facing and allowed to dry, forms a water-resistant, wear-resistant, resilient, tough, uniformly colored facing having a concrete appearance which is easy to maintain and inexpensive to make and apply.
Individual concrete blocks faced with a composition of the present invention easily withstand the regular rigors of handling and shipping.
Such individual blocks may be readily constructed in an assembly-line fashion.
Concrete blocks may be placed in a form made of metal, wood or plastic or some other suitable material.
The bottom and top of the form are open
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Screen Walls 
