Cement
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A cement is a binder used for construction that sets, hardens, and adheres to other materials to bind them together. Cement is seldom used on its own, but rather to bind sand and gravel together. Ceme
Cement powder being poured from a bag, ready to be mixed with aggregates and water.
Clinker nodules produced by sintering at 1450 °C
Calcium oxide obtained by thermal decomposition of calcium carbonate at high temperature (above 825 °C).
William Aspdin is considered the inventor of "modern" Portland cement.
Mortar (masonry)
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Mortar is a workable paste which hardens to bind building blocks such as stones, bricks, and concrete masonry units, to fill and seal the irregular gaps between them, spread the weight of them evenly,
Cement
…them together. Cement is seldom used on its own, but rather to bind sand and gravel (aggregate) together. Cement mixed with fine aggregate produces mortar for masonry, or with sand and gravel, produces concrete. Concrete is the most widely used material in existence and is behind only water as the planet's…
Mortar holding weathered bricks
Roman mortar on display at Chetham's School of Music.
Workers prepare mortar in a trough. A 10th-century sculpture from the Korogho church, Georgia.
Laying bricks with Portland cement mortar