Chapter 8, Problem 8.1QP

To determine

Write the definition of solid and hollow masonry units according to ASTM C90.

Explanation of Solution

Solid masonry:

It is termed as a masonry unit whose net cross-sectional area $A_{\text{net}}$ in every plane, parallel to the ‘bearing surface’, is 75% or greater than the gross-sectional area $A_{\text{gross}}$ in the same plane.

Hollow masonry:

The net cross-sectional area $A_{\text{net}}$ in each plane of masonry, parallel to the ‘bearing surface’, is less than 75% of the gross-sectional area $A_{\text{gross}}$ in the same plane. This is termed as hollow masonry.