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Water measuring equipment needs to be calibrated at intervals
not to exceed -
ANSWER-6 months for scales and 3 months for meters
Accelerated curing temps must be monitored at what locations
along a long line bed - ANSWER-At 200' intervals
What are the approximate average densities for NWT, SLWT
and LWT concrete
- ANSWER-145 - 125 - 110
Typically what is the max curing temp of accelerate concrete -
ANSWER-158
3 types of shop drawings are _____________, ____________,
and
_______________ - ANSWER-Assembly, Production, Erection
(A.P.E)
ASTM C403 - ANSWER-Determines set time of concrete
(L2) When dunnage settles unevenly it can
cause_____________ , and _____________ or other damages to
the products - ANSWER-warping, cracking
Fine aggregate dry weight is 300g and wet weight is 302g. What
is the moisture content % of the aggregate? - ANSWER-0.66%
Water to cement ratio of this mix is what? Cement 725 lb, fly
ash 80 lb, and water of 285 lb. - ANSWER-0.39
,Water to cementitious ratio of this mix is what? Cement 725 lb,
fly ash 80 lb, and water of 285 lb. - ANSWER-0.35
If the sand moisture increases from 4% to 8% and the same
batch quantities are used with the changed moisture, what
will result from the mixture? a) Sand is unchanged and water
increased
b) Sand increases and water decreases
c) Sand decreases and water increases
d) Sand decreases and water decreases - ANSWER-c) Sand
decreases and water increases
(L2) How many strand splice is permitted per strand? -
ANSWER-One (Single strand tensioning is exempt)
(L2) In multiple strand tensioning, strand-splice must be used
for ___________ or ______________ because it is not possible
to compensate differential elongation. - ANSWER-All or None
ASR - ANSWER-Alkali Silica Reaction
(L2) A loaded beam experiences what internal forces of
______________ at the top and ______________ at the bottom?
- ANSWER-Compression and Tension (L2) A beam which is
prestressed at the lower portion experiences what internal
forces at the top and bottom? - ANSWER-Tension and
Compression
Reinforcement steel of any kind must be stored in a matter to
keep it from direct
contact with the ________________ -
ANSWER-Ground Flammable or combustible
materials should be stored: a) Away from
fires
b) In a dark cool place
, c) At room temperature away from smoking areas
d) As recommended by the manufacturer - ANSWER-d) As
recommended by the manufacturer [always!]
Post-tensioning - ANSWER-A method of prestressing concrete
in which the concrete is cast and then the steel tendons are
stressed by jacking.
Pretensioning - ANSWER-tensioning strands between anchors
before concrete is placed
(L2) Inaccurate tensioning can result in _______________and
_______________ - ANSWER-differential camber; inadequate
product strength
ACR - ANSWER-Alkali Carbon Reaction
What is the max temp increase per hour for concrete after initial
set – ANSWER-36
(L2) Welding is not permitted near ______________ whether
prestressed or not - ANSWER-Strands
(L2) Strands with this condition must be
discarded: a) rusting at the surface
b) pitting at the surface
c) discoloration at the surface
d) funny looking surface - ANSWER-b) pitting at the surface
(L2) Chucks should be released using release tools and if
released by striking, materials used in striking must be less
dense than ___________ - ANSWER-Steel
Size of course aggregate should not exceed - ANSWER-1. 1/3
min crosssection of member.
2. 3/4 of mon. clear depth of concrete over reinforcing
3. 2/3 of spacing between rebar, stand or ducts.