Mortar

Mortar is a workable paste used to bind construction blocks together and fill the gaps between them. The blocks may be stone brick etc. Mortar becomes hard when it sets, resulting in a rigid composite structure. Modern mortars are typically made from a mixture of sand, a binder such as cement or lime, and water. Mortar can also be used to fix, or point, masonry when the original mortar has washed away.

WIKIPEDIA ENTRY FOR MORTAR

Mortar Picture   Mortar 2 Picture

Mortar 3 Picture   Mortar 4 Picture