Which of the following is NOT a type of mortar?

Mortar is a crucial material used in masonry construction, and it comes in various types classified by their compressive strength and specific applications. Types N, S, and M are all recognized classifications with defined properties suited for different masonry needs.

Type N mortar, composed of one part Portland cement, one part lime, and six parts sand, is known for being versatile, ideal for above-grade masonry, and suitable for general purposes where moderate strength is needed. Type S has higher compressive strength and is used in structural applications that require greater load-bearing capacity, making it suitable for foundations, brick, and stone masonry. Type M, with the highest compressive strength, is typically used in heavy-load-bearing walls and high-stress applications.

In contrast, Type H is not a recognized or standardized type of mortar. This distinction is significant because the established types (N, S, and M) conform to industry standards set by organizations such as ASTM (American Society for Testing and Materials), while Type H does not fit within these known categories. As a result, the identification of Type H as not being a type of mortar aligns with the fundamental knowledge of masonry materials required in the Seabee Masonry curriculum.