9. Mixing of Concrete
Fresh concrete is a crucial stage in construction that involves several key processes including mixing, transporting, placing, compacting, and finishing. Each step is important to ensure the durability and strength of the final structure. Factors such as workability, segregation, and the use of admixtures can significantly affect the quality of concrete. Environmental conditions must also be considered during the concreting process to prevent complications.
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What we have learnt
- Fresh concrete must be handled with care to maintain its quality.
- Different methods of mixing and transporting concrete affect its properties.
- Compacting and finishing are critical for achieving the desired structural integrity and surface finish.
Key Concepts
- -- Workability
- The ease with which fresh concrete can be mixed, transported, placed, compacted, and finished without segregation or bleeding.
- -- Segregation
- The separation of coarse aggregates from cement paste and fine aggregates, leading to reduced strength and durability.
- -- Admixtures
- Materials added to concrete during mixing to modify its properties, such as improving workability or delaying setting time.
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