Top 8 Important Interview Questions and Answers from IS 456: 2000 for Civil Engineers
Q1. What is the maximum quantity of cement we can use per cubic meter of concrete?
Answer: As per IS 456: 2000 [Clause – 8.2.4.2], the maximum quantity of cement we can use per cubic meter of concrete is 450 kg. Cement content not including fly ash and ground granulated blast furnace slag in excess of 450 kg/m3 should not be used unless special consideration has been given in the design to the increased risk of cracking due to drying shrinkage in thin sections, or to early thermal cracking and to the increased risk of damage due to alkali-silica reactions.
Q2. What is the minimum quantity of cement required for M25 grade of concrete for Moderate condition?
Answer: As per IS 456: 2000 [Table-5], the minimum quantity of cement required for M25 grade of concrete for Moderate condition is 300 kg/m3
Q3. Which grade of concrete termed as Nominal Mix Design?
Answer: As per IS 456: 2000 [Clause – 9.3], Nominal Mix Concrete may be used for concrete of M20 or Lower.
Q4. What is the maximum percentage dosage of retarder we can use?
Answer: As per IS 456: 2000 [Clause – 10.3.3], the maximum percentage dosage of retarder we can use is 0.5 percent by weight of cementitious materials.
Q5. What is the allowable tolerance for Concrete Cover size?
Answer: As per IS 456: 2000 [Clause – 12.3.2], the Actual concrete cover should not deviate from the required nominal cover by +10 mm and -0 mm.
Q6. What is the minimum curing period required when we use blended cement in construction?
Answer: As per IS 456: 2000 [Clause – 13.5.1], the minimum curing period required when we use mineral admixtures or blended cement in construction is 10 days.
Q7. What is the Slump value for Pumped #concrete?
Answer: As per IS 456: 2000 [Clause – 7.1], the Slump value for Pumped concrete is (75 – 100) mm.
Q8. What is the maximum percentage dosage of #plasticizers we can use?
Answer: As per IS 456: 2000 [Clause – 10.3.3], the maximum percentage dosage of plasticizers we can use is 1.0 percent by weight of cementitious materials.
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