Abstract: A cementitious matrix for forming a moulded masonry product, the matrix formed from a group of materials comprising; an aggregate comprising granulated iron blast furnace slag; air-cooled iron blast furnace slag, bottom ash, pulverised fuel ash and at least one cementitious binder; and ground granulated iron blast furnace slag acting as binder and aggregate; and water.

Abstract: A durable, nailable, lightweight and fire resistant fiber cement article that can be a cost-effective substitute for conventional building materials is provided. The fiber cement article can be profiled to resemble a roofing article such as a wood shake or slate. The fiber cement article incorporates a hydrophobe and a viscosity enhancing agent that are each selected to control the rate of hydration of the binder. The fiber cement article is durable, is walkable and nailable without cracking during installation and maintains walkablilty after exposure in service.