Concrete is a dry mixture of cement and some type of aggregate, usually sand and gravel. Cement, when it is mixed with water, becomes the adhesive that holds the aggregate particles together.

MAKUENI, Kenya (AP) — On a dry riverbed one recent sunny morning, residents of Kasengela village toiled away mixing cement and sand to make concrete. The sound of their shovels resonated through ...

Called Holcim Multifix, the product is a combination of sand and cement enhanced with polymer that can be activated just by adding water. Holcim Multifix is produced in the company’s dry mix ...