◉ Where should cylinders be stored after consolidation? Answer: in
or as near to the formwork as posssible
◉ What is the curing temp. of concrete less than 6000psi?(C31)
Answer: 60°F to 80°F
◉ What is the curing temp. of concrete greater than 6000psi?(C31)
Answer: 68°F to 78°F
◉ How long must a cylinder be cured before being
transported?(C31) Answer: 8 hours
◉ The percentage error shall not exceed what percentage for
Compression testing machines? (C39) Answer: 1 % of the indicated
load
◉ Bearing blocks shall have dimensions at least ___ % greater that
the nominal diameter? (C39) Answer: 3%
◉ How often shall testing machines be cleaned and lubricated?
(C39) Answer: atleast every 6 months or as specified by
manufacturer
, ◉ The measure compressive strength of a drilled core is what
compared to properly molded samples? (C42) Answer: less than a
properly molded and cured specimen.
◉ Damages core samples shall not be used unless...(C42) Answer:
The damaged portions are removed and the length/diameter still
satisfies the minimum requirements
◉ When a core is to be tested to measure strength, the cores shall be
drilled....(C42) Answer: purpendicular to the surface, atleast 6" away
from an formed joints or obvious edges
◉ How big should the core sample be for testing compressive
strength?(C42) Answer: atleast 3.70" or 2 times the nominal
aggregate side
◉ What should be done If the core thickness is impossible to obtain?
(C42) Answer: Make sure the L/D ration = 1 and record the reason
for the smaller core
◉ What is the formula for Unit Weight? Answer: Mass of concrete /
volume of measure