Usage patterns
〈場所〉にモルタルを塗るto spread/apply mortar to a surface
We applied mortar to the wall to finish the surface.
モルタルで固めるto solidify/set something with mortar
The bricks were set and stacked using mortar.
モルタルを練るto mix/knead mortar (before use)
The worker is mixing the mortar.