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M.Tech Structural Concretetechnology — practice by topic

Browse 44 questions across 8 Concretetechnology topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Concretetechnology topics

Testing of Concrete (16)Concreting Equipment (12)Special Concrete (7)Cement (4)Concrete Mix Design (2)Aggregates (1)Concrete Technology History (1)Strength of Concrete (1)

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For a concrete mix of very low workability, which of the three IS 1199 methods is best suited?Read the answer and worked solution →In a compression test on a concrete cube using a UTM, at what uniform rate is the uniaxial compressive load applied until destruction?Read the answer and worked solution →For a concrete with cube strength of 30 N/mm², the ratio of cylinder strength to cube strength is reported as:Read the answer and worked solution →In the split-cylinder (indirect tension) test, the horizontal tensile stress along the vertical diameter is given by:Read the answer and worked solution →

Worked practice questions

For a concrete mix of very low workability, which of the three IS 1199 methods is best suited?

  1. Slump cone test
  2. Vee-Bee consistometer test
  3. Kelly ball penetration test
  4. Flow table spread test
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Correct answer: B. Vee-Bee consistometer test

1. Slump cone works for medium workabilities only. 2. Compacting factor extends to a wide range but loses sensitivity at the dry end. 3. Vee-Bee is specifically suited to low and very low workabilities. 4. Kelly ball and flow table are not in the IS 1199 routine set. 5. Hence Vee-Bee is the field test of choice for stiff mixes. _Source: IGNOU ET-522 Concrete Technology, Block 2 Unit 9 "Testing of Concrete"._

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In a compression test on a concrete cube using a UTM, at what uniform rate is the uniaxial compressive load applied until destruction?

  1. 7 N/mm² per minute
  2. 14 N/mm² per minute
  3. 10 N/mm² per minute
  4. 21 N/mm² per minute
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Correct answer: B. 14 N/mm² per minute

1. The IS code prescribes a uniform compression rate so strain-rate effects are controlled. 2. For cube testing the rate is 14 N/mm² per minute applied until the specimen crushes. 3. The peak load at crushing divided by the cross-sectional area gives the cube strength. 4. The 7 N/mm² value belongs to flexure (rate of extreme-fibre stress), not cube compression. 5. Rates of 10 or 21 N/mm² per minute are not specified. _Source: IGNOU ET-522 Concrete Technology, Block 2 Unit 9 "Testing of Concrete"._

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For a concrete with cube strength of 30 N/mm², the ratio of cylinder strength to cube strength is reported as:

  1. 0.50
  2. 0.91
  3. 0.76
  4. 1.00
Show answer and solution

Correct answer: B. 0.91

1. The cylinder/cube ratio rises with concrete strength. 2. At 15 N/mm² cube strength the ratio is about 0.76. 3. At 30 N/mm² cube strength the ratio reaches 0.91. 4. Within the normal working range the average ratio used is 0.80. 5. A ratio of 1.00 would imply identical cube and cylinder strengths, which is not observed. _Source: IGNOU ET-522 Concrete Technology, Block 2 Unit 9 "Testing of Concrete"._

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