A CMU crew is scheduled during freezing weather, and the forecast shows temperatures dropping below freezing overnight. Which plan is appropriate for the masonry work?
Correct Answer
A) Heat materials and protect the completed work as required by the cold-weather masonry provisions
Cold-weather masonry requires temperature control of materials and protection of completed work so mortar can hydrate and bond properly. Other choices: frozen sand, antifreeze, and dry-laid joints are not acceptable quality masonry practice.
Why This Is the Correct Answer
Cold-weather masonry requires temperature control of materials and protection of completed work so mortar can hydrate and bond properly.
Why the Other Options Are Wrong
Option B: Use frozen sand because it will thaw in the mortar, leaving cold weather masonry unverified
Choice B (Use frozen sand because it will thaw in the mortar) is rejected because the option does not produce the required Cold weather masonry outcome, Heat materials and protect the completed work as required by the cold-weather masonry provisions.
Option C: Add automotive antifreeze to the mortar
In masonry work, Add automotive antifreeze to the mortar is the wrong selection for Cold weather masonry: it points to Add automotive antifreeze to the mortar, but.
Option D: Lay units dry and point the joints in spring
The trap in D is Lay units dry and point the joints in spring. That selection is wrong because it answers the Cold weather masonry prompt with the wrong practical move.
Memory Technique
Use the phrase "problem, control, result" for cold weather masonry; the result side is Heat materials and protect the completed work as required by the cold-weather masonry provisions.
Reference Hint
Open Modern Masonry - Brick, Block, Stone, 9th Ed., 2020; use the index entry or section for "Cold weather masonry construction" to confirm that Cold-weather masonry requires temperature control of materials and protection of completed work so mortar can hydrate and bond properly.
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