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The chapter outlines the behavior and properties of fresh concrete, addressing critical phenomena such as segregation, bleeding, slump loss, and re-tempering. It emphasizes the importance of understanding these aspects for effective handling, placement, and finishing on construction sites. Additionally, various control measures and practices are discussed, alongside the use of admixtures, to optimize the characteristics of fresh concrete.
Chapter 840 sections
The chapter outlines the behavior and properties of fresh concrete, addressing critical phenomena such as segregation, bleeding, slump loss, and re-tempering. It emphasizes the importance of understanding these aspects for effective handling, placement, and finishing on construction sites. Additionally, various control measures and practices are discussed, alongside the use of admixtures, to optimize the characteristics of fresh concrete.
Fresh concrete properties significantly impact the quality and durability of hardened concrete.
Segregation and bleeding are critical issues that can affect the performance of concrete.
Proper handling and site practices can minimize defects in fresh concrete.
The separation of concrete's constituents, leading to a non-uniform composition and reduced strength.
The phenomenon where water rises to the surface of freshly placed concrete, caused by the settlement of solid particles.
The reduction in workability of fresh concrete over time, making placement and compaction challenging.
The practice of adding water to concrete after initial setting has begun, often weakening the mix.
Total Questions
2
Estimated Time
4 min
Passing Score
70%
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