Ready to prepare for an interview about concrete technology? We’ve got you covered! We’ve compiled a list of the “Top 50 Must-Know Interview Questions and Answers on Concrete Technology” to help you successfully learn about this fascinating field. Whether you’re a recent graduate or an experienced professional, these questions and answers are designed to test your knowledge, challenge your understanding, and ultimately prepare you for success in your. Upcoming interviews.
Why these 50 Interview Questions?
If you are seeking a comprehensive resource to help you ace your concrete technology interview, you will find our guide “Top 50 Must Know Interview Questions and Answers on Concrete Technology”. It’s exactly what you need to ensure you are thoroughly prepared for your interview. This guide available in PDF format, covers many topics including basic questions and important concepts, to ensure you're thoroughly prepared for your interview
The concrete technology questions and answers PDF includes viva questions and their detailed answers, providing you with a solid foundation for your viva examination. With our expertly curated list of concrete technology interview questions and answers, you can confidently tackle any interview scenario, paving your way to success in this dynamic and growing field.
50 Interview Questions and Answers on Concrete Technology
In this ever-evolving industry, it is important to be up to date on modern concrete work methods, and to possess the ability to deal with problems and solve them. Therefore, our curated list of concrete questions encompasses a broad range of topics, from the fundamentals of concrete composition to cutting-edge techniques in concrete production and testing. With our expertly crafted answers at your fingertips, you’ll be able to impress your future employer with your in-depth knowledge and problem-solving skills.
Our “Top 50 Must-Know Interview Questions and Answers on Concrete Technology” guide, available in a convenient PDF format, is the ultimate resource for candidates looking to excel in the concrete technology field.
This comprehensive collection covers important questions, viva questions in PDF format, and even specific inquiries related to cement companies and ready-mix concrete. The cement questions and answers PDF and concrete questions and answers provide a solid foundation for confidently tackling interviews and exams
Whether you’re preparing for a job interview with a cement company or gearing up for a concrete technology exam, our expertly curated list of questions and answers will ensure that you’re well-prepared to navigate any challenge in this dynamic and growing industry. So, let’s dive right in and get you one step closer to landing that dream job in concrete technology!
1. What is concrete?
Concrete is a composite material comprising cement, water, coarse and fine aggregates, and sometimes admixtures.
Cement = Powder
Cement + Water = Cement Paste
Cement Paste + Fine Aggregate (FA) = Mortar
Mortar + Coarse Aggregate (CA) = Concrete
2.Why concrete is most common construction materials in the world?
Mainly due to its:
i.Flexibility,
ii.Ease of being manufactured,
iii.Its long durability, and ability to sustain extreme weather environments.
3. What are the main basic components of concrete?
The main components of concrete are cement (7.5%-15%), water (14%-21%), and aggregates (60%-75%).
Admixture it’s an optional ingredient which is used for specific purpose only to modify concrete properties
4. What is the function of water in concrete?
Water in concrete is needed for two purposes:
(a) Chemical reaction with cement which results in the hardening of the mixture.
(b) Workability
(Only 1/3 of the water is needed for chemical reaction)
5. What is the role of aggregates in concrete?
Aggregates is an inert material used to provide bulk in concrete and, improving the strength and durability of the mixture.
6. What is the function of cement in concrete?
Cement binds the mixture together and provides strength to the concrete.
The cement paste acts as glue which makes a cohesive mass with all the aggregates
This bonding is important as the concrete fails not because of less strength of aggregates but mainly due to failure of bonding
7. What is the difference between coarse and fine aggregates?
Coarse aggregates are larger than 4.75 mm in size, while fine aggregates are smaller than 4.75 mm in size.
8. What are the physical properties of aggregates?
Gradation
Porosity and Absorption
Moisture content
Specific Gravity
Bulk Density
Bulking of sand
9. What are the types of cement used in concrete?
Various types of cement are used in concrete, including Portland cement, slag cement, fly ash cement, and silica fume cement.
10. What is the setting time of concrete?
The setting time of concrete is the period from the addition of water to the point when the mixture becomes solid and hard.
11. What is the curing time of concrete?
The curing time of concrete is the period required to gain strength and durability.
12. What is the compressive strength of concrete?
The compressive strength of concrete is the maximum load that concrete can withstand before it fails under compression.
13. What is the tensile strength of concrete?
The tensile strength of concrete is the maximum stress that concrete can withstand before it fails under tension.
14. What is the modulus of elasticity of concrete?
The modulus of elasticity of concrete is the ratio of the stress to the strain within the material’s elastic range.
15. What is the water-cement ratio in concrete?
The water-cement ratio in concrete is the ratio of the weight of water to the weight of cement in the mixture.
16. What is the slump test?
The slump test is a standard test used to measure the workability of fresh concrete.
17. What is the air content in concrete?
The air content in concrete is the percentage of air voids in the total volume of the mixture.
18. What is the workability of concrete?
The workability of concrete is the ease with which the concrete can be mixed, transported, and placed in position.
19. What is the significance of the workability of concrete?
The workability of concrete affects the placement, compaction, and finishing of the concrete, as well as the durability and strength of the hardened concrete.
20. What is the maximum size of coarse aggregates used in concrete?
Optimum max aggregate size for structural concrete is 25mm.
Studies have shown that concrete’s made with maximum aggregate size greater than 40mm have lower strength. Because of the smaller surface area for the bond between aggregate to paste.
NOTE: The maximum size of coarse aggregates used in concrete depends on the thickness of the concrete section and the spacing of the reinforcing bars.
21. What is the minimum cement content in concrete?
The minimum cement content in concrete depends on the concrete’s strength requirements and the project’s environmental conditions.
22. What is the significance of the water-cement ratio in concrete?
The water-cement ratio in concrete affects the concrete’s strength, durability, and workability.
23. What is the function of admixtures in concrete?
Admixtures are used in concrete to improve its workability, strength, durability, and setting time.
24. What are the types of admixtures used in concrete?
There are various types of admixtures used in concrete, including
Air-entraining admixtures
Water-reducing admixtures
Plasticizers
Accelerating admixtures
Retarding admixtures
Corrosion inhibitors
Shrinkage reducing admixture
25. What is the difference between dry and wet curing of concrete?
Dry curing involves preventing moisture loss from the surface of the concrete, while wet curing involves keeping the surface moist.
26. What is the effect of temperature on the curing of concrete?
Temperature affects the rate of the chemical reaction between cement and water, and therefore affects the strength gain of concrete during curing.
27. What is the effect of aggregate size on the strength of concrete?
Larger aggregates result in lower strength and workability, while smaller aggregates result in higher strength and workability.
28. What is the difference between normal weight and lightweight concrete?
Normal weight concrete has a density of 2160 to 2560 kg/m3, while lightweight concrete has a density of 240 to 1440 kg/m3.
29. What is the function of reinforcement in concrete?
Reinforcement provides tensile strength to concrete, preventing it from cracking and failing under stress.
30. What is the difference between deformed and plain bars?
Deformed bars have ridges or deformations on their surface, providing better bond with the concrete, while plain bars have a smooth surface.
31. What is the effect of air entrainment on concrete?
Air entrainment increases the durability of concrete by improving its resistance to freeze-thaw cycles and chemical attacks.
32. What is the difference between precast and cast-in-place concrete?
Precast concrete is cast in a factory and transported to the construction site, while cast-in-place concrete is cast and cured on site.
33. What is the function of formwork in concrete construction?
Formwork provides temporary support and shape to concrete until it gains sufficient strength.
34. What is the difference between reinforced and prestressed concrete?
Reinforced concrete has steel reinforcement to provide tensile strength, while prestressed concrete has steel tendons pre-tensioned before the concrete is cast to provide compressive strength.
35. What is the difference between shrinkage and creep of concrete?
Shrinkage is the reduction in volume of concrete due to drying and chemical reactions, while creep is the gradual deformation of concrete under sustained stress.
36. What is the difference between slump and compacting factor tests?
Slump test measures the consistency of concrete while the compacting factor test measures the workability of concrete.
37. What is the difference between flexural strength and compressive strength of concrete?
Flexural strength is the ability of concrete to resist bending or flexing while compressive strength is the ability of concrete to withstand compressive forces.
38. What is the function of curing compounds in concrete?
Curing compounds are used to prevent moisture loss from the surface of concrete during curing, reducing the need for wet curing.
39. What is the difference between hot and cold weather concreting?
Hot weather concreting involves preventing the rapid evaporation of water from the surface of the concrete, while cold weather concreting involves preventing the freezing of the concrete before it gains strength.
40. What is the significance of the water-reducing admixture in concrete?
Water-reducing admixtures reduce the amount of water needed to achieve a workable mix, increasing the strength and durability of concrete.
41. What is the difference between cement and concrete?
Cement is a binding material used in concrete, while concrete is a composite material made of cement, water, and aggregates.
42. What is the significance of the aggregate-cement ratio in concrete?
The aggregate-cement ratio in concrete affects the strength and durability of the concrete, and also affects its workability.
43. What is the difference between high-strength and normal-strength concrete?
High-strength concrete has a compressive strength greater than 40 MPa, while normal-strength concrete has a compressive strength between 20 to 40 MPa.
44. What is the significance of the water permeability of concrete?
The water permeability of concrete affects the durability and resistance of concrete to various environmental factors like freezing and thawing cycles.
45. What is the difference between short-term and long-term shrinkage of concrete?
Short-term shrinkage occurs due to the rapid loss of moisture from the concrete after it has been cast, while long-term shrinkage occurs over time due to the slow drying and aging of the concrete.
46. What is the difference between shotcrete and gunite?
Shotcrete and gunite are both forms of sprayed concrete. However, shotcrete is sprayed with compressed air after mixing, while gunite is sprayed with a dry mix and water at the nozzle.
47. What is the difference between an admixture and an additive in concrete?
An admixture is a chemical compound added to concrete during mixing to improve its properties, while an additive is a material added to concrete before or after mixing to enhance its properties.
48. What is the difference between Portland cement and blended cement?
Portland cement is a type of cement made by heating limestone, clay, and other materials, while blended cement is a mixture of Portland cement and supplementary cementitious materials like fly ash or slag.
49. What is the difference between workability and flowability of concrete?
Workability is the ease of placing and compacting concrete, while flowability is the ability of concrete to flow and fill narrow and congested spaces.
50. What is the effect of air temperature on concrete curing?
Air temperature affects the rate of chemical reactions during concrete curing, and higher temperatures accelerate the curing process, while lower temperatures slow it down.
51. What is the function of curing blankets in concrete curing?
Curing blankets are used to maintain a constant temperature and moisture level during concrete curing, preventing rapid moisture loss and temperature fluctuations.
52. What is the formula for the density of concrete?
The formula for the density of concrete is ρ = M/V, where ρ is the density, M is the mass, and V is the volume.
53. What is the formula for calculating the water-cement ratio in concrete?
The formula for calculating the water-cement ratio in concrete is W/C = (weight of water/weight of cement).
54. What is the formula for calculating the compressive strength of concrete?
The formula for calculating the compressive strength of concrete is Cf = P/A, where Cf is the compressive strength, P is the maximum compressive load, and A is the cross-sectional area.
55. What is the difference between slump and compaction factor tests?
Slump and compaction factor tests are used to measure concrete workability. Slump measures the deformation of the concrete under its weight, while compaction factor measures the ease of compaction of the concrete using a vibrating table.
56. What is the role of admixtures in concrete?
Admixtures are added to concrete to modify its properties, such as workability, setting time, strength, and durability. They can also improve the performance of the concrete under specific conditions, such as in extreme temperatures or corrosive environments.
57. How does the water-cement ratio affect the strength of concrete?
The water-cement ratio affects the strength of concrete by influencing the porosity and permeability of the concrete. A higher water-cement ratio results in more porous and permeable concrete, which leads to lower strength and durability.
58.List down the Ratio of Grades M10, M15, M20, M25, M30, M35, and M40?
c. M10 – 1:4:8
d. M15 – 1:3:6
e. M20 – 1:2:4
f. M25 – 1:1.5:3
g. M30 - 1:1:2
h. M35, M40 – Design Mix Followed
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Conclusion
In conclusion, our “Top 50 Must-Know Interview Questions and Answers on Concrete Technology” guide is your ultimate resource for acing your upcoming interview in this dynamic and growing field. By thoroughly reviewing these questions and answers, you’ll expand your knowledge and boost your confidence, ensuring that you make a lasting impression on your future employer. Remember, preparation is key, and with this comprehensive guide, you’re already well on your way to securing a rewarding career in concrete technology. So conquer those interviews and build a strong foundation for your future success in this exciting industry!