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M.Tech Structural Water for Concrete — practice questions

Explore 6 free Water for 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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Water for Concrete questions and exercises with answers

Showing questions 1–6 of 6.

Per §3.3.2, which of the following salts in mixing water is described as 'completely destructive' to concrete strength?Read the answer and worked solution →Per Table 3.2, the tolerable limit on TOTAL DISSOLVED SALTS in mixing water for concrete is:Read the answer and worked solution →Per Table 3.2, the recommended pH range of mixing water for concrete is:Read the answer and worked solution →Per §3.4, sea water has an average salinity of approximately:Read the answer and worked solution →Per §3.4, sea water is most strictly to be AVOIDED for use as mixing water in:Read the answer and worked solution →Per §3.4, sea water typically reduces the 28-day strength of concrete by the order of:Read the answer and worked solution →

Worked practice questions

Per §3.3.2, which of the following salts in mixing water is described as 'completely destructive' to concrete strength?

  1. Sodium iodate
  2. Lead nitrate
  3. Zinc chloride
  4. Sodium carbonate
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Correct answer: B. Lead nitrate

1. §3.3.2 reads: 'The effect of lead nitrate is completely destructive.' 2. Zinc chlorides retard set, sodium carbonate may cause quick setting, sodium iodate reduces initial strength — but none are described as completely destructive. _Source: IGNOU ET-522 Block-1 Unit-3 Water, §3.3.2, p. 42_

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Per Table 3.2, the tolerable limit on TOTAL DISSOLVED SALTS in mixing water for concrete is:

  1. 1,000 ppm of the mix water
  2. 10,000 ppm of the mix water
  3. 15,000 ppm of the mix water
  4. 50,000 ppm of the mix water
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Correct answer: C. 15,000 ppm of the mix water

1. Table 3.2 in §3.3.4 lists Total dissolved salts at 15,000 ppm. 2. Chlorides are capped at 10,000 ppm, sulphuric anhydride at 3,000 ppm, organic material at 3,000 ppm and pH between 4.5 and 8.5. _Source: IGNOU ET-522 Block-1 Unit-3 Water, Table 3.2, §3.3.4, p. 42_

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Per Table 3.2, the recommended pH range of mixing water for concrete is:

  1. 1.0 to 3.5
  2. 12.0 to 14.0
  3. 9.0 to 11.0
  4. 4.5 to 8.5
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Correct answer: D. 4.5 to 8.5

1. Table 3.2 in §3.3.4 lists pH limits of 4.5 to 8.5 for mixing water. 2. §3.3.3 also gives an acidity rule-of-thumb that pH above 6 is generally safe. _Source: IGNOU ET-522 Block-1 Unit-3 Water, Table 3.2, §3.3.4, p. 42_

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More Civil Engineering topics

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