Vietnam is bordered by China to the north, Laos to the northwest, Cambodia to the southwest, Thailand across the Gulf of Thailand to the southwest, and the Philippines, Malaysia and Indonesia across the South China Sea to the east and southeast.[d] Its capital city has been Hanoi since the reunification of North and South Vietnam in 1976, with Ho ...
Cement. 1  Cement is a binder. Similar to flour in a recipe, the purpose of cement is to hold the other materials together. 2  Concrete is a composite of aggregate (such as sand or gravel), cement, and water. Itâs like a cookie. 3  The basic composition of mortar might seem similar to concrete, but what really sets it apart is how it is used.
Concrete is something more than cement. It is a mixture of cement, gravel, and sand. All these ingredients are mixed in the correct proportions with water to form concrete. The cement in the mixture gets bound to the sand and gravel, thus forming a uniform mixture. Both concrete and cement are used as building materials in construction purposes. These are used between bricks, rocks, or such structures to keep the structure intact. Portland cement is a variety of cement and is usually used for building oilrigs, lighthouses, dams, and bridges.