Question
In: Civil Engineering
Design a concrete mix for reinforced concrete beams of a structure. The structure is located in...
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 bulk specific gravity (SSD) of 2.63; absorption capacity of 1.25%; surface moisture of 3.0% and a fineness modulus of 2.75. Coarse aggregate has bulk specific gravity (SSD) of 2.70; absorption capacity of 2.50 %; surface moisture of 1.75% based on SSD state and dry-rodded unit weight of 110 lb/ft3. Design concrete mix following the step-by-step method of ACI 211.1-91 for the subject beams and tabulate the quantities of ingredient materials in lb/yd3, lb/ft3 and 1.5 lb/ft3. Provide reference of relevant ACI Tables in each step.
Solutions
Expert Solution
Complete mix design with given specifications is shown below.
Ally Wells answered 9 months agoRelated Solutions
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A concrete mix is required for reinforced concrete wave breaker
at seashore where frequent mild freezing and thawing is
dominant.
A specified compressive strength of 25 MPa is required at the age
of 28 days, and the size of the section and reinforcement dictate
using a maximum aggregate size of 19 mm.
The company had no history of testing concrete used.
The coarse aggregate meets the ASTM grading requirements. It has
absorption of 2%, a BSG (D) of 2.70 and...
A concrete mix is required for reinforced concrete wave breaker at seashore where frequent mild freezing...
A concrete mix is required for reinforced concrete wave breaker
at seashore where frequent mild freezing and thawing is dominant. A
specified compressive strength of 25 MPa is required at the age of
28 days, and the size of the section and reinforcement dictate
using a maximum aggregate size of 19 mm. The company had no history
of testing concrete used. The coarse aggregate meets the ASTM
grading requirements. It has absorption of 2%, a BSG (D) of 2.70
and...
A concrete mix is required for reinforced concrete wave breaker at seashore where frequent mild freezing...
A concrete mix is required for
reinforced concrete wave breaker at seashore where frequent mild
freezing and thawing is dominant. A specified compressive strength
of 25 MPa is required at the age of 28 days, and the size of the
section and reinforcement dictate using a maximum aggregate size of
19 mm. The company had no history of testing concrete used. The
coarse aggregate meets the ASTM grading requirements. It has
absorption of 2%, a BSG (D) of 2.70 and...
A concrete mix is required for reinforced concrete wave breaker at seashore where frequent mild freezing...
A concrete mix is required for reinforced concrete wave breaker
at seashore where frequent mild freezing and thawing is dominant. A
specified compressive strength of 25 MPa is required at the age of
28 days, and the size of the section and reinforcement dictate
using a maximum aggregate size of 19 mm. The company had no history
of testing concrete used. The coarse aggregate meets the ASTM
grading requirements. It has absorption of 2%, a BSG (D) of 2.70
and...
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available are ordinary Portland cement, and uncrushed fine and
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size of coarse aggregate is 10mm and fine aggregate confirms to the
grading zone III. Neglect the effect of standard deviation and
other factors.
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