Mortar on a board has started to stiffen late in the morning. The mason asks to add water repeatedly and keep it for the afternoon. What should the foreman require?
Correct Answer
B) Follow the specification limits for retempering and discard mortar that has begun to set or exceeded its allowed time
Mortar can only be retempered within allowed limits before initial set or the specified time limit; old or setting mortar should be discarded. Other choices weaken quality control or hide poor mortar in selected joints.
Why This Is the Correct Answer
Mortar can only be retempered within allowed limits before initial set or the specified time limit; old or setting mortar should be discarded. Other choices weaken quality control or hide poor mortar in selected joints.
Why the Other Options Are Wrong
Option A: The foreman should keep retempering indefinitely as long as color is unchanged
Choice A gives Keep retempering indefinitely as long as color is unchanged. Its specific error: it points to Keep retempering indefinitely as long as color is unchanged, but.
Option C: Add hydrated lime until the mortar softens
In masonry work, Add hydrated lime until the mortar softens is the wrong selection for Mortar retempering: it leaves out the controlling Mortar retempering result: Follow the specification limits for retempering and discard mortar that has begun to set or exceeded its.
Option D: The foreman should use the old mortar only for head joints
The trap in D is Use the old mortar only for head joints. That selection is wrong because it leaves the work at an informal or incomplete stage, while Mortar retempering requires Follow the specification limits for retempering and discard mortar that has begun to set or.; Mortar retempering is limited; mortar that has begun to set or is too old should not be used.
Memory Technique
Pair mortar retempering with the real field trigger, then choose the response that produces Follow the specification limits for retempering and discard mortar that has begun to set or exceeded its allowed time.
Reference Hint
Open Modern Masonry - Brick, Block, Stone, 9th Ed., 2020; use the index entry or section for "Mortar mixing, tempering, and time limits" to confirm that Mortar can only be retempered within allowed limits before initial set or the specified time limit; old or setting mortar should be discarded.
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