(a) In terms of relative strength, put fcd (design strength of concrete), fck (characteristic strength of...

(a) In terms of relative strength, put fcd (design strength of concrete), fck
(characteristic strength of concrete) and fcm (mean strength of
concrete) in order from lowest to highest strength. (3)
(b) Approximately, what is the tensile strength of concrete as a
percentage of its compressive strength? (1)
(c) Draw and name all necessary reinforcement for the simply supported
beam and static loading case shown at Figure 3a. (6)
(d) Recreate the table in Figure 3b in your script books and fill in by
writing “Poor” and “Good” words to describe the property of the
material.

Expert Solution

a) fm( mean strength ) > characterstics strength > desighn strength

Expalantion-

fm = fck+1.6σ

where fck is characteristic strength

fd (design strength ) will be fck/f.o.s(factor of safety)

b) tensile strength of concrete is 10% of compressive strength of concrete

in question c and d figure is necessary to find the value

Ally Wells answered 10 months ago

Design a concrete mix by using ACI Method of Mix Design having 28-day characteristic mean strength...

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...

Q 1: Design a concrete mix for the following performances and ingredients: * Compressive strength at...

Q 1: Design a concrete mix for the following performances and ingredients: * Compressive strength at 28 days = 32 MPa, slump 80 mm * Crushed coarse aggregate of max size 20 mm readily available * Fine aggregate is river sand, fineness modulus = 2.5 * Cement Strength Class = 42.5 * Specific gravity of combined aggregate =2.6 * Water absorption of coarse aggregate = 0.8% * Water absorption of fine aggregate = 0.5% Q 2: Design a concrete mix...

Design a concrete mixture that has a 28 day compressive strength of 4000 psi and a...

Design a concrete mixture that has a 28 day compressive strength of 4000 psi and a maximum size aggregate of 0.75 in. The concrete would be placed in a column exposed to freezing and thawing and will be in contact with a soil that has a sulfate content of 0.3%. Step 1: Assemble information from specifications and local materials Cement: Use any type and assume a specific gravity of 3.15 Coarse Aggregate: Bulk Specific Gravity (BSG) – 2.65 Absorption Capacity...

Q1) Design a concrete mix by using ACI Method of Mix Design having 28-day characteristic mean...

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...

Strength of concrete: The compressive strength, in kilopascals, was measured for concrete blocks from five different...

Strength of concrete: The compressive strength, in kilopascals, was measured for concrete blocks from five different batches of concrete, both three and six after pouring. The data are as follows. Can you conclude that the mean strength after three days is less than the mean strength after six days? Let U1 represent the mean strength after three days and ud=u1-u2, Use the a=0.01 level and the critical value method with the table. 1. State the appropriate null and alternate hypotheses....

Strength of concrete: The compressive strength, in kilopascals, was measure for concrete blocks from five different...

Strength of concrete: The compressive strength, in kilopascals, was measure for concrete blocks from five different batches of concrete, both three and six days after pouring. The data are as follows: Block 1 2 3 4 5 After 3 days 1341 1316 1352 1355 1327 After 6 days 1376 1373 1366 1384 1358 Can you conclude that the mean strength after three days differs from the mean strength after six days? Use the α = 0.05 level of significance. State...

How does the aggregate strength affect normal concrete strength?

Recall the difference between working stress (WSD) and ultimate strength (USD) design procedures for reinforced concrete.

Why structural concrete is reinforced by steel? Discuss the weakness and strength of both concrete and...

Why structural concrete is reinforced by steel? Discuss the weakness and strength of both concrete and steel in this case

A civil engineer is analyzing the compressive strength of concrete. Compressive strength is approximately Normally distributed...

A civil engineer is analyzing the compressive strength of concrete. Compressive strength is approximately Normally distributed with variance ? 2 = 1000 psi2 . A random sample of ? = 12 specimens has a mean compressive strength of ?̅= 3179.5 psi. Let ? be the true mean compressive strength of all specimens from this type of concrete. (a) Test ?0: ? = 3200 against ??: ? < 3200 at ? = 0.05. Give the rejection region. (b) If the true...

Question