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Questions and Answers
What are the two main components that define the workability of concrete?
Why is sufficient workability a vital property for the finished concrete product?
What is the relationship between voids in concrete and its strength?
What is the primary function of cement in concrete?
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What is the primary function of aggregate in concrete?
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What is the primary function of water in concrete?
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What is the primary function of cement in concrete?
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Why is water added to the concrete mixture?
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What is the primary function of aggregates in concrete?
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Which characteristic of normal-weight concrete is mentioned in the text?
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What is the primary reason for using fine aggregate in concrete?
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Which statement about the functions of constituents in concrete is true?
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Which factor influences the workability of concrete by decreasing the interparticle friction?
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What aggregate characteristic requires more water to act as a lubricant, resulting in lower workability?
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For a constant water/cement ratio, how does the workability of concrete change with the aggregate/cement ratio?
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What is the main factor that influences the workability of concrete according to the text?
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In concrete, why is a well-graded aggregate preferred?
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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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Description
Explore the roles of cement and aggregate in concrete construction, including filling voids, binding aggregates, imparting strength, providing volume stability, and more.
