What are the grad of mortar?

Really they are different. Because 'mortar' which is usually called refers to the mixture of cement, sand and water. Whereas, lime mortar refers to the mixture of lime, sand and water. But both are...

Undergrad

mortar (a workable paste formed by mixture of cement, water and fine aggregate masonry to bind construction blocks together and fill gaps between them)

Mortars were a smooth bored of cannon with a high trajectory. They were effective against trenches and fortifications because they dropped down behind walls and barriers. Most of today's modern...