A grout submittal for reinforced masonry lists compressive strength. Which minimum value is commonly required for masonry grout unless the documents require more?
Correct Answer
B) 2,000 psi
Masonry grout is commonly required to reach at least 2,000 psi compressive strength unless the design documents require a higher value. Other choices: 750 psi is a mortar strength value, while 3,000 psi and 5,000 psi may be project-specific but are not the common minimum.
Why This Is the Correct Answer
Masonry grout is commonly required to reach at least 2,000 psi compressive strength unless the design documents require a higher value.
Why the Other Options Are Wrong
Option A: 750 psi
Choice A (750 psi) is rejected because 750 psi is a different published number than the cited Masonry grout strength value; Masonry grout ASTM C476 strength guidance supports 2,000 psi. The cited answer is 2,000 psi.
Option C: 3,000 psi
The trap in C is 3,000 psi. That selection is wrong because 3,000 psi is a different published number than the cited Masonry grout strength value; Masonry grout ASTM C476 strength guidance supports 2,000 psi; Masonry grout minimum compressive strength is commonly 2,000 psi.
Option D: 5,000 psi
Choice D gives 5,000 psi. Its specific error: 5,000 psi is a different published number than the cited Masonry grout strength value; Masonry grout ASTM C476 strength guidance supports 2,000 psi. The accepted answer is 2,000 psi.
Memory Technique
Use a rough-in sticker memory cue for masonry grout strength: the stem's condition unlocks 2,000 psi.
Reference Hint
Open Modern Masonry - Brick, Block, Stone, 9th Ed., 2020; use the index entry or section for "Masonry grout ASTM C476 strength guidance" to confirm that Masonry grout is commonly required to reach at least 2,000 psi compressive strength unless the design documents require a higher value.
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