by The RK Multiverse
1. What is RCC and PCC?
RCC contains steel reinforcement to resist tension, while PCC has no reinforcement.
2. What is workability of concrete?
Ease of mixing, placing, compacting, and finishing concrete.
3. What is curing?
Maintaining moisture and temperature for strength gain.
4. Minimum curing period?
7 days (OPC), 10 days in hot weather.
5. Compressive strength?
Ability to resist axial load (MPa).
6. Slump test?
Measures workability of fresh concrete.
7. Purpose of foundation?
Transfers load safely to ground.
8. Retaining wall?
Holds soil and prevents erosion.
9. Concrete mix design?
Proportioning materials for strength and durability.
10. Nominal vs design mix?
Nominal = fixed ratio, Design = calculated.
11. Water-cement ratio?
Ratio of water weight to cement weight.
12. One-way vs two-way slab?
One-way carries load in one direction, two-way in both.
13. M20 concrete?
20 MPa strength after 28 days.
14. Reinforcement?
Steel bars to resist tension.
15. Cube test?
Checks compressive strength.
16. Structural drawing?
Detailed construction drawings.
17. Beam vs column?
Beam = horizontal, Column = vertical.
18. Dead vs live load?
Dead = permanent, Live = temporary.
19. Survey?
Establishes boundaries and levels.
20. Plinth beam?
Transfers wall load to foundation.
21. Aggregates?
Coarse (>4.75mm) & Fine (<4.75mm).
22. Prestressed concrete?
Concrete with induced internal stresses.
23. Site engineer role?
Supervision, quality, safety.
24. Shear vs retaining wall?
Shear resists lateral force, retaining holds soil.
25. Cantilever beam?
Fixed at one end, free at other.
26. Segregation?
Separation of materials.
27. Bleeding?
Water rising to surface.
28. Honeycombing?
Voids due to poor compaction.
29. Foundations?
Shallow & deep.
30. Column starter?
Initial column extension.
31. Lap length?
Overlap of rebars.
32. Cover block?
Maintains spacing of rebar.
33. Stirrups?
Resist shear in beams.
34. Cube size?
150×150×150 mm.
35. Camber?
Road slope for drainage.
36. Soft story?
Weak floor prone to earthquake damage.
37. BBS?
Bar bending schedule.
38. Stair components?
Tread, riser, landing, handrail.
39. Pile foundation?
Deep foundation system.
40. Shuttering & centering?
Formwork & support system.
41. NDT?
Non-Destructive Testing.
42. Concrete density?
2400 kg/m³.
43. Grouting?
Filling cracks and voids.
44. IS vs IRC?
IS = General, IRC = Road.
45. Expansion joints?
Allow thermal movement.
46. Modular ratio?
Elasticity ratio (steel/concrete).
47. Slump for M20?
75–100 mm.
48. Dev vs lap length?
Development = bond length, Lap = overlap.
49. Concreting steps?
Batching → Mixing → Placing → Compaction → Curing.
50. Minimum RCC grade?
M20.