Before conducting a concrete mix design, what information on raw
materials and background data should you...
Before conducting a concrete mix design, what information on raw
materials and background data should you collect?
Construction engoneering.
Solutions
Expert Solution
Water
quality also we should know before mix desgin because it should
free from alkalies which obesrve water from mix. I provided raw
data before going to concrete mix design
What will you propose for a concrete mix design to be
used in constructing a bridge pier during a cold winter month. The
bridge is designed to be constructed on a site where sulfate attack
on the concrete is a problem. In this project, high cost is not
allowed and the concrete’s cost must be priority without lowering
quality.
7) You are working on a concrete mix design that requires each
cubic yard of concrete to have a 0.45 water–cement ratio,2100
lb/yd3 of dry gravel, 250 lb/yd3 of water, and 5% air content. The
available gravel (NMS = ¾”) has a specific gravity of 2.6 ,
moisture content of 2.5% and absorption of 4.5%.The available sand
has a specific gravity of 2.4, a moisture content of 2.5% and
absorption of 2%. Air entrainer is to be included using the...
7) You are working on a concrete mix design that requires each
cubic yard of concrete to have a 0.45 water–cement ratio,2100
lb/yd3 of dry gravel, 250 lb/yd3 of water, and 5% air content. The
available gravel (NMS = ¾”) has a specific gravity of 2.6 ,
moisture content of 2.5% and absorption of 4.5%.The available sand
has a specific gravity of 2.4, a moisture content of 2.5% and
absorption of 2%. Air entrainer is to be included using the...
Design a concrete mix for the superstructure of a
building using DoE mix design method requiring a characteristic
strength of 40MPa at 28days and a slump of 30-60mm. The materials
available are ordinary Portland cement, and uncrushed fine and
coarse aggregates of specific gravity of 2.65. The maximum nominal
size of coarse aggregate is 10mm and fine aggregate confirms to the
grading zone III. Neglect the effect of standard deviation and
other factors.
Design a concrete mix for reinforced concrete beams of a
structure. The structure is located in a locality wherein water has
excess of chlorides in it. Required average compressive strength of
concrete has been determined to be 4700 psi. Beams have
cross-section of 9 in. x 21 in. reinforced with 4 # 6 bars.
Reinforcement has a concrete cover of 1.25 in. and there is a clear
space of 1.0 in. between form surface and steel bars. Fine
aggregate has...
Why concrete mix proportions need to be
designed? After completing the design mix process,
explain what are the next steps to be done?
If the same concrete mix proportions calculated in
(a) is to be used for application near marine environment or in
heavy industrial area, suggest with justification
the possible modification that can be
done.
Design a concrete mix by using ACI Method of Mix Design having 28-day characteristic mean strength of 28 MPa for a deck of a residential building at Nebraska. Dry weather and gradually warming temperatures may be expected throughout the working week. Fresh concrete composed of a slump of 90 mm and maximum aggregate size of 25 mm. Determine the amount of water reducing admixture to be used for 0.24 % and 0.35 %. Deck is a flat surface capable of...
Q1) Design a concrete mix by using ACI
Method of Mix Design having 28-day characteristic mean
strength of 27 MPa for a deck of a residential
building at Nebraska. Dry weather and gradually warming
temperatures may be expected throughout the working week. Fresh
concrete composed of a slump of 90 mm and maximum aggregate size of
25 mm. Determine the amount of water reducing admixture to be used
for 0.24 % and 0.65 %. Deck is a
flat surface capable...