Asbestos-cement pipe contains which of the following materials?

Asbestos-cement pipe is composed primarily of a mixture of portland cement and asbestos fibers, which provides strength and resistance to chemical corrosion. Among the choices listed, silica sand serves as a key component in the manufacturing of asbestos-cement pipe. It acts as a filler material that helps in creating a more durable product.

Silica sand contributes to the overall structural integrity and aids the cement in setting properly. While the other materials mentioned, such as calcium carbonate, granite aggregate, and clay, are commonly found in various construction materials or applications, they are not integral components of traditional asbestos-cement pipe. Silica sand's role is crucial, as it not only enhances the properties of the pipe but also affects its performance in water distribution systems and other uses.