Correct.
ASTM C270-19a §7.4 allows stiffened mortar to be retempered with water as often as needed, and bars use of any mortar more than 2 1 over 2 h after mixing. Discarding it because retempering is prohibited reflects a common error; C270 allows retempering. Limiting retempering to one time has no basis in §7.4, which allows it as often as needed. §7.4 allows retempering with water, not adding cement, and no mortar may be used beyond 2 1 over 2 h.
1 of 1 right so far.
Question 2 of 10.
The project specification calls for 'ASTM C270 mortar' but states neither proportion nor property requirements. The mortar is field-batched cement-lime mortar. Which requirements govern?
A: The proportion requirements
B: The property requirements, because they are stricter
C: Whichever the mason chooses, if the choice is recorded
D: Neither until the architect issues a clarification; masonry work must stop
NEXT: A · B · C · D
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