Short handle mortar spray gun

Mortar spraying is the rendering of mortar at high velocity to achieve compaction and placement at the same time. This research aimed at conceptualizing various options, leading to the development, design and fabrication of a semi-automated machine to reduce the amount of time taken in plastering.

Mortar has a basic recipe of three components: Portland cement, hydrated lime, and sand. Portland cement gives the mixture strength, lime gives flexibility and elasticity, while the sand acts as a binding agent. There are five main grades of mortar mix: K, O, N, S, and M.

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, and sometimes to add decorative colours or patterns to masonry walls.