The cement-based paste used to bond bricks, blocks, and stones together in masonry construction.
Mortar is a workable paste made from cement, sand, and water used to bond masonry units such as brick, CMU, and stone, and to fill the joints between them. Different mortar types (M, S, N, O) have different compressive strengths suited to different applications and exposure conditions. Mortar joint quality significantly affects masonry wall performance and appearance.
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