Question

Hollow concrete masonry blocks typically have a net cross sectional area which is at least 25% less than the gross area. (T or F)

A concrete masonry unit has actual gross dimensions of 7-5/8” x 7-5/8” x 7-5/8”. The unit is tested in a compression machine with the following results.

Max. failure load = 98 kips.

Net volume = 348.1 in³

                                                                                                                                                T or F

4.       The unit is categorized as solid.                                                         _____

5.       The gross area compressive strength is 1,631.6 psi.                                ______

6.       The net area compressive strength is 2,147.9 psi.                                    ______

Answer 1