Method for producing efflorescence resistant coating on cementitious substrate

A method of producing an efflorescence resistant coating on a cementitious substrate comprising:

• foaming an efflorescence resistant coating composition comprising an aqueous evaporable carrier containing a latex binder having a Tg in range varying from -20.degree. C. to 100.degree. C., a weight average molecular weight in the range varying from 500 to 5,000,000;
• a foaming agent;
• a coalescent;
• and a wetting agent in the range of from 0.1 weight percent to 10 weight percent based on emulsion solids for reducing surface tension;
• applying a foamed layer of said efflorescence resistant coating composition on the surface of a wet cementitious substrate without physically disturbing said surface, said wetting agent in said composition enhancing surface contact between said foamed layer and said surface;
• collapsing said foamed layer on said surface of said wet cementitious substrate;
• and
• hydrating said wet cementitious substrate having said efflorescence resistant coating thereon.

A method of producing an efflorescence resistant coating comprising:

• foaming an efflorescence resistant coating composition into a foam having substantially uniform cell size, said composition comprising an aqueous evaporable carrier containing a latex binder having a Tg in range varying from -20.degree. C. to 100.degree. C., a weight average molecular weight in the range varying from 500 to 5,000,000;
• a foaming agent;
• a coalescent;
• a homogenizing agent and a wetting agent;
• uniformly distributing on the surface of a wet or green cementitious substrate, a foamed layer of said efflorescence resistant coating composition to substantially contact said surface without physically disturbing said surface;
• collapsing said layer on said surface to form said efflorescence resistant coating thereon;
• and
• hydrating said wet or green cementitious substrate.

A method of producing an efflorescence resistant coating comprising:

• foaming an efflorescence resistant coating composition into a foam having substantially uniform cell size, said composition comprising an aqueous evaporable carrier containing a latex binder having a Tg in range varying from -20.degree. C. to 100.degree. C., a weight average molecular weight in the range varying from 500 to 5,000,000;
• a foaming agent selected from the group consisting of alkali metal, ammonium and amine salts of C.sub.12 -C.sub.24 aliphatic carboxylic acids, and mixtures thereof;
• a coalescent;
• a homogenizing agent and a wetting agent;
• uniformly distributing on the surface of a hydrated cementitious substrate, a foamed layer of said efflorescence resistant coating composition to substantially contact the surface of said hydrated cementitious substrate;
• and
• collapsing said layer on said surface to form said efflorescence resistant coating thereon.

A method of producing an efflorescence resistant coating comprising:

• foaming an efflorescence resistant coating composition into a foam having substantially uniform cell size, said composition comprising an aqueous evaporable carrier containing a latex binder having a Tg in range varying from -20.degree. C. to 100.degree. C., a weight average molecular weight in the range varying from 500 to 5,000,000;
• a foaming agent;
• a coalescent;
• a homogenizing agent and a wetting agent;
• uniformly distributing on the surface of a slurry, a foamed layer said efflorescence resistant coating composition to substantially contact said surface without physically disturbing said surface;
• collapsing said layer on said surface to form said efflorescence resistant coating thereon;
• and
• hydrating said slurry.