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Questions and Answers
What are the two main components that define the workability of concrete?
What are the two main components that define the workability of concrete?
- Compaction and segregation
- Consistency and cohesiveness (correct)
- Voids and strength reduction
- Density and strength ratio
Why is sufficient workability a vital property for the finished concrete product?
Why is sufficient workability a vital property for the finished concrete product?
- It allows for maximum compaction with reasonable effort.
- It reduces the amount of voids in the concrete.
- It increases the strength ratio of the concrete.
- All of the above (correct)
What is the relationship between voids in concrete and its strength?
What is the relationship between voids in concrete and its strength?
- 5% voids can lower strength by 10%.
- Voids have no effect on concrete strength.
- 5% voids can lower strength by 30%. (correct)
- 2% voids can lower strength by 30%.
What is the primary function of cement in concrete?
What is the primary function of cement in concrete?
What is the primary function of aggregate in concrete?
What is the primary function of aggregate in concrete?
What is the primary function of water in concrete?
What is the primary function of water in concrete?
What is the primary function of cement in concrete?
What is the primary function of cement in concrete?
Why is water added to the concrete mixture?
Why is water added to the concrete mixture?
What is the primary function of aggregates in concrete?
What is the primary function of aggregates in concrete?
Which characteristic of normal-weight concrete is mentioned in the text?
Which characteristic of normal-weight concrete is mentioned in the text?
What is the primary reason for using fine aggregate in concrete?
What is the primary reason for using fine aggregate in concrete?
Which statement about the functions of constituents in concrete is true?
Which statement about the functions of constituents in concrete is true?
Which factor influences the workability of concrete by decreasing the interparticle friction?
Which factor influences the workability of concrete by decreasing the interparticle friction?
What aggregate characteristic requires more water to act as a lubricant, resulting in lower workability?
What aggregate characteristic requires more water to act as a lubricant, resulting in lower workability?
For a constant water/cement ratio, how does the workability of concrete change with the aggregate/cement ratio?
For a constant water/cement ratio, how does the workability of concrete change with the aggregate/cement ratio?
What is the main factor that influences the workability of concrete according to the text?
What is the main factor that influences the workability of concrete according to the text?
In concrete, why is a well-graded aggregate preferred?
In concrete, why is a well-graded aggregate preferred?
What happens to the strength of concrete with a 10% reduction in density?
What happens to the strength of concrete with a 10% reduction in density?
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Study Notes
- Workability of concrete is a composite property with two main components: Consistency (mobility of concrete) and Cohesiveness (water-holding and aggregate-holding capacity).
- Workability is crucial for achieving maximum density during compaction with a reasonable amount of effort, as voids in concrete can significantly reduce its strength.
- The functions of constituents in concrete include cement filling voids and binding aggregates, aggregates providing volume and stability, and water aiding in adhesion, workability, and hydration of cement.
- Three types of concrete based on unit weight are normal-weight concrete (2400 kg/m3), lightweight concrete, and heavyweight concrete.
- Factors affecting workability include water content (higher water/cement ratio reduces strength), aggregate type and gradation (finer particles require more water, larger aggregate size increases workability), aggregate/cement ratio (lower ratio increases workability), and aggregate grading (well-graded aggregates have fewer voids).
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