In California's high seismic zones, what is the required minimum compressive strength of grout used in reinforced masonry construction per CBC specifications?
Correct Answer
A) 2,000 psi
CBC Section 2103.12 requires grout in reinforced masonry to have a minimum compressive strength of 2,000 psi. This strength requirement ensures adequate bond with reinforcement and proper load transfer in seismic conditions. The grout must also be proportioned to achieve sufficient fluidity for complete filling of cells and bond beam cavities.
Why This Is the Correct Answer
CBC Section 2103.12 sets the minimum compressive strength of grout in reinforced masonry at 2,000 psi. This baseline ensures adequate bond with reinforcement bars and proper load transfer under seismic loading, while also maintaining enough fluidity to fully fill masonry cells and bond beams.
Why the Other Options Are Wrong
Option B: 2,500 psi
2,500 psi is above the CBC minimum requirement. While higher-strength grout is permissible, the code-mandated minimum is 2,000 psi — not 2,500 psi.
Option C: 3,000 psi
3,000 psi exceeds the minimum requirement by 50%. This strength is associated with structural concrete mixes, not the masonry grout minimum under CBC Section 2103.12.
Option D: 1,500 psi
1,500 psi falls below the CBC minimum and would be non-compliant. Grout at this strength lacks sufficient bond capacity for reinforced masonry in seismic zones.
Memory Technique
Associate '2,000 psi grout' with 'two-thousand years of masonry tradition' — masonry is one of the oldest building methods, and 2,000 is its baseline number in the CBC.
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