9. Topics in Hardened Concrete
The chapter delves into the various physical and mechanical properties of hardened concrete, encompassing its strength, elasticity, creep, shrinkage, permeability, durability, fire resistance, and chemical attacks. It discusses testing methods and presents modern concrete types such as high-performance, fiber-reinforced, and self-compacting concrete, emphasizing their applications. Understanding these properties and behaviors is crucial for optimizing concrete's structural integrity and longevity.
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What we have learnt
- Concrete transitions to a rigid state upon hardening, which is essential for its structural function.
- Key properties of hardened concrete include compressive strength, tensile strength, and flexural strength, which are influenced by factors like the water-cement ratio and curing conditions.
- Durability issues such as chemical attacks and corrosion can significantly affect concrete's lifespan and require specific preventive measures.
Key Concepts
- -- Compressive Strength
- The ability of concrete to withstand axial compressive loads without failure.
- -- Creep
- A gradual, time-dependent increase in strain under sustained load, affecting the long-term deformation of concrete.
- -- Tensile Strength
- Resilience of concrete against axial tensile loads, crucial for various structural applications.
- -- Permeability
- The ease with which fluids can penetrate concrete, affecting its durability and susceptibility to damage.
- -- Durability
- The ability of concrete to withstand weathering, chemical attacks, and other deteriorative processes throughout its service life.
- -- Fiber Reinforced Concrete (FRC)
- Concrete that incorporates fibrous materials to enhance structural integrity and performance.
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