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M.Tech Structural Strength of Concrete — practice questions

Explore 6 free Strength of Concrete 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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Strength of Concrete questions and exercises with answers

Showing questions 1–6 of 6.

Per §7.2 ('Richness of Mix'), the aggregate/cement ratio is typically taken as 'very rich' and 'very lean' respectively at values of about:Read the answer and worked solution →Per §7.3, the determination of compressive strength is preferred as the primary test because:Read the answer and worked solution →Per §7.6.3, creep of concrete is best defined as the:Read the answer and worked solution →Per §7.6.3, if the creep deformation at 1 year is taken as unity, the source quotes the relative creep at 30 years as approximately:Read the answer and worked solution →Per §7.6.4, the three types of shrinkage recognised in hardened-concrete deformation are:Read the answer and worked solution →Tap TRUE or FALSE for each concrete-technology statement.Read the answer and worked solution →

Worked practice questions

Per §7.2 ('Richness of Mix'), the aggregate/cement ratio is typically taken as 'very rich' and 'very lean' respectively at values of about:

  1. 1 and 4
  2. 0.5 and 1.5
  3. 20 and 50
  4. 2.5 and 10
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Correct answer: D. 2.5 and 10

1. §7.2 (Richness of Mix) reads: 'The aggregate/cement ratio may vary generally between 2.5 to 10 where 2.5 and 10 is to be taken as very rich and very lean mix respectively.' 2. At constant water-cement ratio, a leaner mix has fewer voids per unit concrete volume and so slightly higher strength. _Source: IGNOU ET-522 Block-2 Unit-7 Strength of Concrete, §7.2, p. 47_

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Per §7.3, the determination of compressive strength is preferred as the primary test because:

  1. It directly gives the flexural strength too
  2. It is the quickest and easiest test to perform
  3. It is the only failure mode in real structures
  4. It avoids any need for curing of the sample
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Correct answer: B. It is the quickest and easiest test to perform

1. §7.3 reads: 'Of the various strengths of concrete the determination of compressive strength is very quick and easy. **Hence it is customary to determine other strengths like flexural strength, tensile strength etc. from compressive strength through some empirical relation.'** 2. Flexural-to-compressive ratios are given in Table 7.3 and CRRI relations (Eq. 7.9-7.12). _Source: IGNOU ET-522 Block-2 Unit-7 Strength of Concrete, §7.3, p. 52_

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Per §7.6.3, creep of concrete is best defined as the:

  1. Reduction in volume due to drying alone
  2. Increase in strain under sustained constant stress
  3. Elastic recovery on unloading the specimen
  4. Instantaneous strain at the moment of loading
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Correct answer: B. Increase in strain under sustained constant stress

1. §7.6.3 reads: 'Creep can thus be defined as the increase in strain under a sustained stress and since this increase can be several times as large as the strain on loading, creep is of considerable importance in structural mechanics.' 2. Under constant strain instead, creep manifests as stress relaxation. _Source: IGNOU ET-522 Block-2 Unit-7 Strength of Concrete, §7.6.3, p. 58_

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More Civil Engineering topics

GATE Civil — Core TopicsCementStrength of MaterialsAggregatesTesting of ConcreteConcreting EquipmentWorkability of Fresh ConcreteConcrete Mix Design