Process for the production of concrete building products

A process for production of concrete roofing products of reduced weight loading having high flexural strength and high impact strength and a thickness in section of not greater than 15 mm which process comprises forming an asbestos-free cementitious composition comprising (i) lightweight aggregate, (ii) hydraulic cement, (iii) water, (iv) reinforcing fibres in an amount of not more than 4% by weight of a total weight of said composition and said fibres being present in an amount sufficient to provide a reinforcing effect, high flexural strength and high impact strength in said roofing products, and (v) a polymer latex in weight ratio of polymer, calculated as dry weight, to said hydraulic cement within a range of 5:100 to 50:100, said formed cementitious composition being capable of being shaped by a roller and slipper method, and thereafter shaping said formed cementitious composition by said roller and slipper method to produce a shaped extrudate, dividing said extrudate to form sections and curing said sections to product said roofing products of reduced weight loading having high flexural strength and high impact strength, wherein said reinforcing fibres have lengths of 0.5 mm to 20 mm.

A process for production of concrete roofing products of reduced weight loading having high flexural strength and high impact strength and a thickness in section of not greater than 15 mm which process comprises forming an asbestos-free cementitious composition comprising (i) lightweight aggregate, (ii) hydraulic cement, (iii) water and (iv) reinforcing fibres in weight percent to a total weight of said composition of 0.15% to 4%, said formed cementitious composition being capable of being shaped by a roller and slipper method, and thereafter shaping said formed cementitious composition by said roller and slipper method to produce a shaped extrudate, dividing said extrudate to form sections and curing said sections to produce said roofing products of reduced weight loading having high flexural strength and high impact strength, wherein said reinforcing fibres have lengths of 2.0 mm to 20 mm.

A process for production of concrete roofing products of reduced weight loading having high flexural strength and high impact strength and a thickness in section of not greater than 15 mm which process comprises forming an asbestos-free cementitious composition comprising (i) lightweight aggregate, (ii) hydraulic cement, (iii) water, (iv) reinforcing fibers in weight percent to a total weight of said composition of 0.15% to 4%, and (v) a polymer latex in weight ratio of polymer, calculated as dry weight, to said hydraulic cement within a range of 5:100 to 50:100, said formed cementitious composition being capable of being shaped by a roller and slipper method, and thereafter shaping said formed cementitious composition by said roller and slipper method to produce a shaped extrudate, dividing said extrudate to form sections and curing said sections to produce said roofing products of reduced weight loading having high flexural strength and high impact strength, wherein said reinforcing fibres have lengths of 2.0 mm to 20 mm.