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M.Tech Structural Concrete Mix Design — practice questions

Explore 10 free Concrete Mix Design questions in M.Tech Structural Civil Engineering. Open each question or exercise to read its content, reference answers and available explanation.

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Concrete Mix Design questions and exercises with answers

Showing questions 1–10 of 10.

Per §10.3, the maximum nominal aggregate size RECOMMENDED for high-strength concrete is:Read the answer and worked solution →Per §10.4 and IS 456-78, the minimum sample size to determine the standard deviation σ for concrete is:Read the answer and worked solution →Per §10.5, the Himsworth constant K (multiplier of σ) used to obtain target mean strength under the Indian Standard's 5 percent risk factor is:Read the answer and worked solution →Per §10.5, the area under the normal distribution curve between (μ - σ) and (μ + σ) is approximately:Read the answer and worked solution →Per §10.4, the maximum coefficient of variation V (= σ/μ × 100) accepted by Indian Standard for concrete is:Read the answer and worked solution →Per §10.7, the Indian Standard method of concrete mix design is described in:Read the answer and worked solution →Per Table 10.3, the suggested standard deviation σ for M 20 grade concrete with 'GOOD' degree of control is:Read the answer and worked solution →Per Table 10.5 (durability in mix design), the MINIMUM cement content for REINFORCED concrete in 'severe' exposure is:Read the answer and worked solution →Tap TRUE or FALSE for each mix-design / mass-concrete statement.Read the answer and worked solution →Tap the steps of the IS Method of mix design in the correct order.Read the answer and worked solution →

Worked practice questions

Per §10.3, the maximum nominal aggregate size RECOMMENDED for high-strength concrete is:

  1. 63 mm
  2. 20 mm
  3. 40 mm
  4. 10 mm
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Correct answer: D. 10 mm

1. §10.3: 'for high strength concrete 10 mm maximum nominal size aggregate is recommended. 20 mm maximum nominal size aggregate is preferable against about 40 mm in case of medium strength concrete.' 2. Larger aggregate sizes hurt interface bond and bring stress concentrations in rich mixes. _Source: IGNOU ET-522 Block-3 Unit-10 Concrete Mix Design, §10.3, p. 7_

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Per §10.4 and IS 456-78, the minimum sample size to determine the standard deviation σ for concrete is:

  1. At least 10 test results
  2. At least 30 test results
  3. At least 20 test results
  4. At least 100 test results
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Correct answer: B. At least 30 test results

1. §10.4: 'For determination of σ at least 30 samples are to be taken as per IS 456 - 78.' 2. The same section caps the coefficient of variation V = (σ/μ) × 100 at 15 percent for acceptable concrete production. _Source: IGNOU ET-522 Block-3 Unit-10 Concrete Mix Design, §10.4, p. 8_

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Per §10.5, the Himsworth constant K (multiplier of σ) used to obtain target mean strength under the Indian Standard's 5 percent risk factor is:

  1. 1.00
  2. 3.00
  3. 2.20
  4. 1.65
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Correct answer: D. 1.65

1. §10.5: 'ftarget = fck + 1.65σ' for IS at 5 percent risk the value 1.65 is Himsworth's constant. American Standard accepts a 2 percent risk factor whose Himsworth constant is 2.2 (Eq. 10.5B). 2. Lower the risk factor, higher the Himsworth constant and the larger the target strength against the same characteristic strength. _Source: IGNOU ET-522 Block-3 Unit-10 Concrete Mix Design, §10.5, Eq. 10.5/10.5A/10.5B, p. 10_

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More Civil Engineering topics

GATE Civil — Core TopicsCementStrength of MaterialsAggregatesTesting of ConcreteConcreting EquipmentWorkability of Fresh ConcreteSpecial Concrete