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US 4,309,325 AGranted
Clay-cement mortars and to the product made with said mortars
AssigneeSociete Metallurgique de Bretagne
InventorsMichel Laquerbe, Francois Tatard
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AssigneeSociete Metallurgique de Bretagne
InventorsMichel Laquerbe, Francois Tatard
Estimating the term…
The invention provides a clay/cement mortar which sets without cracking to a product having good mechanical properties, the mortar containing cement, clay in an amount by weight greater than that of the cement, gauging water, and an additive chosen from urea-formaldehyde and melamine-formaldehyde resins and derivatives of ammonia such as formamide, the dry weight of additive being between 1 and 20% of the total dry weight of the clay and cement. The clay is preferably basic or rendered so by addition of silicates or sodium aluminates, and absorbed water is preferably removed therefrom before mixing with the cement by adding a flocculant or water repellent. Adjuvants which may be incorporated in the mortar include paraffin, aluminium powder, glass and the like, and acrylic, A.B.S. and the like polymer emulsions. The mortar, after being formed to desired shape, is preferably kept for several hours in an atmosphere saturated with water vapor before being dried slowly to cause setting with curing of the additive.
A mortar consisting of a cement, clay in a proportion by weight which is between 1.5 and 4 times that of the cement, gauging water, and an additive selected from the group consisting of urea-formaldehyde resins, melamine-formaldehyde resins and formamide, the dry weight of additive present being between 1 and 20% of the total weight of the clay and cement, and said clay having a pH which is basic.
A mortar consisting of a cement, clay in a proportion by weight which is between 1.5 and 4 times that of the cement, aluminum powder, gauging water, and an additive selected from the group consisting of ureaformaldehyde resins, melamine-formaldehyde resins and formamide, the dry weight of additive present being between 1 and 20% of the total weight of the clay and cement, and said clay having a pH which is basic.
A mortar consisting of a cement, clay in a proportion by weight which is between 1.5 and 4 times that of the cement, gauging water, an additive selected from the group consisting of ureaformaldehyde resins, melamine-formaldehyde resins and formamide, the dry weight of additive present being between 1 and 20% of the total weight of the clay and cement and an emulsion of polymer selected from the group consisting of acrylic and A.B.S. polymers the dry weight of said polymer being between 5 and 25% of the total dry weight of the clay and cement, and said clay having a pH which is basic.
In a shaped set clay/cement product, containing clay in a proportion by weight which is between 1.5 and 4 times that of the cement the improvement which comprises a reinforcement dispersed through said product, said reinforcement comprising cured resin selected from the group consisting of cured urea-formaldehyde and melamine formaldehyde resins.
A mortar consisting of a cement, clay in a proportion by weight which is between 1.5 and 4 times that of the cement, gauging water, an additive selected from the group consisting of urea-formaldehyde resins, melamine-formaldehyde resins and formamide, the dry weight of additive present being between 1 and 20% of the total weight of the clay and cement, and, as a further additive, a paraffin in an amount of between 0.3 and 5% of the weight of the cement, and said clay having a pH which is basic, said mortar containing no polyvinyl acetate or components with epoxy sulfonic acid group containing constituents.
A method of preparing a mortar which comprises mixing a cement, clay in a proportion by weight which is between 1.5 and 4 times that of the cement, gauging water, and an additive selected from the group consisting of urea-formaldehyde resins, melamine-formaldehyde resins and formamide, the dry weight of additive present being between 1 and 20% of the total weight of the clay and cement, and said clay having a pH which is basic, adding, with mixing, simultaneously, but separately, sodium aluminate and sodium silicate in substantially identical proportions by weight, the amount by weight of each of these salts being between 0.2 and 1% of the weight of the dry clay-cement mixture to the mixture of the other components of the mortar just prior to the final shaping thereof.
A mortar consisting of a cement, clay in a proportion by weight which is between 1.5 and 4 times that of the cement, gauging water, and an additive which is a urea-formaldehyde resin, the dry weight of additive present being between 1 and 20% of the total weight of the clay and cement, and said clay having a pH which is basic.
A mortar consisting of a cement, clay in a proportion by weight which is between 1.5 and 4 times that of the cement, gauging water, and an additive which is a formamide, the dry weight of additive present being between 1 and 20% of the total weight of the clay and cement, and said clay having a pH which is basic.
Dependencies are inferred from the claim text.