SSC JE Exam - concrete properties aggregates water cement ratio workability mix design batching mixing placement compaction curing quality control repair maintenance Online Test (MCQ Quiz)

1. Which property of concrete is primarily influenced by the aggregate's shape and texture?

A) Compressive strength B) Workability C) Durability D) Density

2. What is the primary function of cement in concrete?

A) To provide bulk and reduce shrinkage B) To act as a binder and hydrate C) To improve workability and reduce water demand D) To enhance durability and resistance to weathering

3. The water-cement ratio is a critical factor determining which concrete property?

A) Initial setting time B) Compressive strength and durability C) Heat of hydration D) Surface texture

4. A higher water-cement ratio generally leads to:

A) Increased strength and reduced permeability B) Reduced strength and increased permeability C) Increased workability and reduced strength D) Reduced workability and increased strength

5. Which of the following is NOT a type of aggregate commonly used in concrete?

A) Coarse aggregate B) Fine aggregate C) Lightweight aggregate D) Superfine aggregate

6. The process of measuring and proportioning concrete ingredients is called:

A) Mixing B) Batching C) Placing D) Compaction

7. Which test is commonly used to measure the workability of fresh concrete?

A) Compression test B) Slump test C) Abrasion test D) Soundness test

8. What is the ideal range for the water-cement ratio for most structural concrete applications?

A) 0.25 to 0.35 B) 0.40 to 0.60 C) 0.70 to 0.85 D) 0.90 to 1.00

9. The process of arranging the proportions of concrete ingredients to achieve specific properties is known as:

A) Batching B) Mixing C) Mix design D) Quality control

10. Which type of mixing is generally preferred for producing uniform concrete?

A) Hand mixing B) Machine mixing C) Site mixing D) Ready-mix concrete

11. What is the primary objective of compaction in concrete?

A) To increase the water content B) To remove entrapped air and achieve a dense mass C) To improve the surface finish D) To accelerate the setting time

12. Which method of compaction is suitable for heavily reinforced sections and difficult-to-reach areas?

A) Tamping B) Vibration C) Rolling D) Manual tamping

13. Curing is essential for:

A) Rapid drying of concrete B) Ensuring proper hydration of cement and strength development C) Increasing the initial workability D) Reducing the heat of hydration

14. Which of the following is a method of wet curing for concrete?

A) Application of curing compounds B) Ponding C) Wrapping with burlap D) Plastic sheeting

15. Quality control in concrete involves:

A) Only testing the final product B) Monitoring and controlling all stages from raw materials to finished product C) Reducing the cost of concrete production D) Increasing the slump of the concrete

16. Which test is performed on hardened concrete to determine its compressive strength?

A) Slump test B) Vee-Bee test C) Cube test D) Kelly Ball test

17. What is the purpose of adding admixtures to concrete?

A) To replace cement B) To modify properties like workability, setting time, or durability C) To increase the aggregate content D) To reduce the mixing time

18. Superplasticizers are a type of admixture used to:

A) Accelerate the setting time B) Reduce the water content significantly while maintaining workability C) Increase the heat of hydration D) Improve the resistance to freezing and thawing

19. The minimum period for curing concrete generally depends on:

A) The ambient temperature and humidity B) The type of cement used C) The desired strength and type of cement D) All of the above

20. What is the main cause of segregation in concrete?

A) Proper vibration B) Excessive vibration or dropping concrete from a great height C) Low water-cement ratio D) Using well-graded aggregates

21. Bleeding in concrete refers to:

A) The process of compaction B) The upward movement of water towards the surface C) The development of strength D) The initial setting of cement

22. Which factor significantly affects the rate of hydration of cement?

A) The shape of aggregates B) The water-cement ratio and temperature C) The type of admixture D) The mixing procedure

23. A low workability concrete mix is typically used for:

A) Massive concrete structures like dams B) Thin sections with heavy reinforcement C) Road pavements D) Footings

24. The 'fineness modulus' is a measure related to:

A) The strength of cement B) The grading of aggregates C) The workability of concrete D) The setting time of concrete

25. Which test is used to determine the resistance of aggregates to crushing?

A) Impact test B) Abrasion test C) Crushing strength test D) Soundness test

26. The primary purpose of using air-entraining admixtures is to improve:

A) Compressive strength B) Resistance to freezing and thawing cycles C) Workability D) Durability in dry conditions

27. What is the primary reason for using Supplementary Cementitious Materials (SCMs) like fly ash or silica fume?

A) To increase the initial setting time B) To enhance durability, reduce heat of hydration, and improve workability C) To reduce the cost of concrete D) To increase the slump significantly

28. Which of the following is a common method for repairing spalled concrete surfaces?

A) Applying a thin layer of cement paste B) Chipping away loose concrete and applying a suitable repair mortar C) Increasing the water-cement ratio D) Adding more coarse aggregate

29. The 'maturity' of concrete refers to:

A) The initial setting time B) The degree of hydration and potential strength development C) The workability D) The surface finish

30. What is the primary goal of maintenance for concrete structures?

A) To increase the load-carrying capacity B) To preserve structural integrity and extend service life C) To change the appearance of the concrete D) To reduce the cost of construction

31. Which type of mixer is commonly used for large-scale construction projects where large volumes of concrete are required?

A) Pan mixer B) Drum mixer (Tilting or Non-tilting) C) Hand mixer D) Paddle mixer

32. The 'setting time' of cement refers to:

A) The time taken for concrete to achieve full strength B) The time interval between the addition of water and the loss of plasticity C) The time taken for concrete to be placed D) The time for complete hydration

33. Which property of aggregate influences the shrinkage of concrete?

A) Specific gravity B) Absorption and moisture content C) Crushing strength D) Hardness

34. What is the purpose of a slump cone in the slump test?

A) To measure the density of concrete B) To measure the consistency or workability of fresh concrete C) To determine the setting time D) To assess the air content

35. Which type of aggregate is produced by crushing rocks?

A) Natural aggregate B) Manufactured aggregate C) Artificial aggregate D) Recycled aggregate

36. The maximum size of aggregate used in concrete is typically limited by:

A) The desired workability B) The minimum dimension of the structural member and spacing of reinforcement C) The type of cement used D) The batching method

37. Which of the following is a common cause of cracking in hardened concrete?

A) Proper curing B) Drying shrinkage, thermal stresses, and settlement C) Low water-cement ratio D) Adequate compaction

38. What is the role of admixtures in achieving high-strength concrete?

A) They are not used in high-strength concrete B) Water reducers and superplasticizers are crucial for reducing water content C) They primarily increase the aggregate size D) They accelerate the initial setting time only

39. The rate of strength gain in concrete is generally:

A) Uniform throughout its life B) Faster at early ages and slows down over time C) Slower at early ages and faster later D) Constant regardless of temperature

40. Which of the following is an example of a test for durability of concrete?

A) Slump test B) Compression test C) Chloride penetration test D) Initial setting time test

41. What is the term for concrete that is produced in a factory and transported to the site?

A) Site-mixed concrete B) Ready-mix concrete C) Precast concrete D) In-situ concrete

42. The 'soundness' of aggregate refers to its resistance to:

A) Crushing B) Abrasion C) Weathering and disintegration D) Impact

43. Which factor has the most significant impact on the long-term durability of concrete?

A) The color of the cement B) The water-cement ratio and the quality of constituents C) The type of mixing equipment D) The method of batching

44. What is the process of applying a wet covering (like sand or burlap) to maintain moisture for hydration called?

A) Spraying B) Sheet curing C) Wet curing D) Steam curing

45. Which type of batching involves weighing each ingredient separately?

A) Volumetric batching B) Weight batching C) Manual batching D) Automatic batching

46. The 'impact value' test for aggregates measures their:

A) Hardness B) Toughness C) Resistance to sudden shock or fracture D) Shape

47. What is the principal binder in concrete?

A) Aggregate B) Water C) Portland cement D) Admixture

48. The process of ensuring that concrete is placed and compacted properly to fill all forms and surround reinforcement is called:

A) Batching B) Mixing C) Placement and Compaction D) Curing

49. Which of the following is a critical parameter controlled during concrete quality control?

A) The color of the mixing water B) The consistency of the mix and the strength of hardened concrete C) The ambient temperature during mixing D) The brand of the aggregate supplier

50. Repairing cracks in concrete by injecting epoxy or grout is a method for:

A) Improving workability B) Restoring structural integrity and preventing further deterioration C) Increasing the heat of hydration D) Reducing the density

concrete properties aggregates water cement ratio workability mix design batching mixing placement compaction curing quality control repair maintenance - Online Test

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