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B.Tech Civil Testing of Concrete — practice questions

Explore 16 free Testing of Concrete questions in B.Tech Civil Concretetechnology. Open each question or exercise to read its content, reference answers and available explanation.

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Testing of Concrete questions and exercises with answers

Showing questions 1–16 of 16.

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 →For the splitting test on a cube of side a using a semi-cylindrical loading piece, the splitting tensile strength is given by:Read the answer and worked solution →Flexure beam tests use four-point loading. For the larger 150 × 150 × 750 mm beam, what is the prescribed rate of central load increase?Read the answer and worked solution →The rebound hammer commonly used in non-destructive testing of concrete was developed in 1948 and is best known by which inventor's name?Read the answer and worked solution →The portable instrument used for measuring ultrasonic pulse velocity through concrete with a digital output is known as:Read the answer and worked solution →Using the Leslie–Cheesman classification (Table 9.1), a pulse velocity reading of 3800 m/s through concrete corresponds to which general condition?Read the answer and worked solution →Match each concrete test to the property it primarily measures.Read the answer and worked solution →Match each non-destructive test instrument to what it measures on concrete.Read the answer and worked solution →Swipe each test LEFT if it acts on fresh concrete, RIGHT if it acts on hardened concrete.Read the answer and worked solution →Tap the cube compression test procedure in the correct order.Read the answer and worked solution →Tap the word in each statement that is wrong, then read the correction.Read the answer and worked solution →Pick the pulse-velocity reading that points to a HIGHER concrete quality (Leslie–Cheesman).Read the answer and worked solution →Fill the IS-code numerical values into the standard concrete specifications.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
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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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